Skip to content

L
linux
Commit a9648072 authored by Linus Torvalds's avatar Linus Torvalds
Browse files
Options

Merge tag 'for-linus-4.12b-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip 

Pull xen updates from Juergen Gross:
 "Xen fixes and featrues for 4.12. The main changes are:

   - enable building the kernel with Xen support but without enabling
     paravirtualized mode (Vitaly Kuznetsov)

   - add a new 9pfs xen frontend driver (Stefano Stabellini)

   - simplify Xen's cpuid handling by making use of cpu capabilities
     (Juergen Gross)

   - add/modify some headers for new Xen paravirtualized devices
     (Oleksandr Andrushchenko)

   - EFI reset_system support under Xen (Julien Grall)

   - and the usual cleanups and corrections"

* tag 'for-linus-4.12b-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (57 commits)
  xen: Move xen_have_vector_callback definition to enlighten.c
  xen: Implement EFI reset_system callback
  arm/xen: Consolidate calls to shutdown hypercall in a single helper
  xen: Export xen_reboot
  xen/x86: Call xen_smp_intr_init_pv() on BSP
  xen: Revert commits da72ff5b and 72a9b186
  xen/pvh: Do not fill kernel's e820 map in init_pvh_bootparams()
  xen/scsifront: use offset_in_page() macro
  xen/arm,arm64: rename __generic_dma_ops to xen_get_dma_ops
  xen/arm,arm64: fix xen_dma_ops after 815dd187 "Consolidate get_dma_ops..."
  xen/9pfs: select CONFIG_XEN_XENBUS_FRONTEND
  x86/cpu: remove hypervisor specific set_cpu_features
  vmware: set cpu capabilities during platform initialization
  x86/xen: use capabilities instead of fake cpuid values for xsave
  x86/xen: use capabilities instead of fake cpuid values for x2apic
  x86/xen: use capabilities instead of fake cpuid values for mwait
  x86/xen: use capabilities instead of fake cpuid values for acpi
  x86/xen: use capabilities instead of fake cpuid values for acc
  x86/xen: use capabilities instead of fake cpuid values for mtrr
  x86/xen: use capabilities instead of fake cpuid values for aperf
  ...
parents a1be8edd 3dbd8204
Show whitespace changes
Inline Side-by-side
Showing with 8490 additions and 5381 deletions
arch/arm/include/asm/device.h
View file @ a9648072
......@@ -15,6 +15,9 @@ struct dev_archdata {
#endif
#ifdef CONFIG_ARM_DMA_USE_IOMMU
struct dma_iommu_mapping *mapping;
#endif
#ifdef CONFIG_XEN
const struct dma_map_ops *dev_dma_ops;
#endif
bool dma_coherent;
};
......
arch/arm/include/asm/dma-mapping.h
View file @ a9648072
......@@ -16,19 +16,9 @@
extern const struct dma_map_ops arm_dma_ops;
extern const struct dma_map_ops arm_coherent_dma_ops;
static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (dev && dev->dma_ops)
return dev->dma_ops;
return &arm_dma_ops;
}
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
if (xen_initial_domain())
return xen_dma_ops;
else
return __generic_dma_ops(NULL);
return &arm_dma_ops;
}
#define HAVE_ARCH_DMA_SUPPORTED 1
......
arch/arm/mm/dma-mapping.c
View file @ a9648072
......@@ -2414,6 +2414,13 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
dma_ops = arm_get_dma_map_ops(coherent);
set_dma_ops(dev, dma_ops);
#ifdef CONFIG_XEN
if (xen_initial_domain()) {
dev->archdata.dev_dma_ops = dev->dma_ops;
dev->dma_ops = xen_dma_ops;
}
#endif
}
void arch_teardown_dma_ops(struct device *dev)
......
arch/arm/xen/efi.c
View file @ a9648072
......@@ -35,6 +35,6 @@ void __init xen_efi_runtime_setup(void)
efi.update_capsule = xen_efi_update_capsule;
efi.query_capsule_caps = xen_efi_query_capsule_caps;
efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
efi.reset_system = NULL; /* Functionality provided by Xen. */
efi.reset_system = xen_efi_reset_system;
}
EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);
arch/arm/xen/enlighten.c
View file @ a9648072
......@@ -191,20 +191,24 @@ static int xen_dying_cpu(unsigned int cpu)
return 0;
}
static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
struct sched_shutdown r = { .reason = reason };
int rc;
rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
BUG_ON(rc);
}
static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
{
xen_reboot(SHUTDOWN_reboot);
}
static void xen_power_off(void)
{
struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
int rc;
rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
BUG_ON(rc);
xen_reboot(SHUTDOWN_poweroff);
}
static irqreturn_t xen_arm_callback(int irq, void *arg)
......
arch/arm64/include/asm/device.h
View file @ a9648072
......@@ -19,6 +19,9 @@
struct dev_archdata {
#ifdef CONFIG_IOMMU_API
void *iommu; /* private IOMMU data */
#endif
#ifdef CONFIG_XEN
const struct dma_map_ops *dev_dma_ops;
#endif
bool dma_coherent;
};
......
arch/arm64/include/asm/dma-mapping.h
View file @ a9648072
......@@ -27,11 +27,8 @@
#define DMA_ERROR_CODE (~(dma_addr_t)0)
extern const struct dma_map_ops dummy_dma_ops;
static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
if (dev && dev->dma_ops)
return dev->dma_ops;
/*
* We expect no ISA devices, and all other DMA masters are expected to
* have someone call arch_setup_dma_ops at device creation time.
......@@ -39,14 +36,6 @@ static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
return &dummy_dma_ops;
}
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
if (xen_initial_domain())
return xen_dma_ops;
else
return __generic_dma_ops(NULL);
}
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct iommu_ops *iommu, bool coherent);
#define arch_setup_dma_ops arch_setup_dma_ops
......
arch/arm64/mm/dma-mapping.c
View file @ a9648072
......@@ -977,4 +977,11 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
dev->archdata.dma_coherent = coherent;
__iommu_setup_dma_ops(dev, dma_base, size, iommu);
#ifdef CONFIG_XEN
if (xen_initial_domain()) {
dev->archdata.dev_dma_ops = dev->dma_ops;
dev->dma_ops = xen_dma_ops;
}
#endif
}
arch/x86/include/asm/hypervisor.h
View file @ a9648072
......@@ -35,9 +35,6 @@ struct hypervisor_x86 {
/* Detection routine */
uint32_t (*detect)(void);
/* Adjust CPU feature bits (run once per CPU) */
void (*set_cpu_features)(struct cpuinfo_x86 *);
/* Platform setup (run once per boot) */
void (*init_platform)(void);
......@@ -53,15 +50,14 @@ extern const struct hypervisor_x86 *x86_hyper;
/* Recognized hypervisors */
extern const struct hypervisor_x86 x86_hyper_vmware;
extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
extern const struct hypervisor_x86 x86_hyper_xen;
extern const struct hypervisor_x86 x86_hyper_xen_pv;
extern const struct hypervisor_x86 x86_hyper_xen_hvm;
extern const struct hypervisor_x86 x86_hyper_kvm;
extern void init_hypervisor(struct cpuinfo_x86 *c);
extern void init_hypervisor_platform(void);
extern bool hypervisor_x2apic_available(void);
extern void hypervisor_pin_vcpu(int cpu);
#else
static inline void init_hypervisor(struct cpuinfo_x86 *c) { }
static inline void init_hypervisor_platform(void) { }
static inline bool hypervisor_x2apic_available(void) { return false; }
#endif /* CONFIG_HYPERVISOR_GUEST */
......
arch/x86/include/asm/xen/events.h
View file @ a9648072
......@@ -20,4 +20,15 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
/* No need for a barrier -- XCHG is a barrier on x86. */
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
extern int xen_have_vector_callback;
/*
* Events delivered via platform PCI interrupts are always
* routed to vcpu 0 and hence cannot be rebound.
*/
static inline bool xen_support_evtchn_rebind(void)
{
return (!xen_hvm_domain() || xen_have_vector_callback);
}
#endif /* _ASM_X86_XEN_EVENTS_H */
arch/x86/include/asm/xen/page.h
View file @ a9648072
......@@ -52,12 +52,30 @@ extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
unsigned long pfn_e);
#ifdef CONFIG_XEN_PV
extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count);
extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count);
#else
static inline int
set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count)
{
return 0;
}
static inline int
clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count)
{
return 0;
}
#endif
/*
* Helper functions to write or read unsigned long values to/from
......@@ -73,6 +91,7 @@ static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
return __get_user(*val, (unsigned long __user *)addr);
}
#ifdef CONFIG_XEN_PV
/*
* When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
* - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
......@@ -99,6 +118,12 @@ static inline unsigned long __pfn_to_mfn(unsigned long pfn)
return mfn;
}
#else
static inline unsigned long __pfn_to_mfn(unsigned long pfn)
{
return pfn;
}
#endif
static inline unsigned long pfn_to_mfn(unsigned long pfn)
{
......
arch/x86/kernel/cpu/common.c
View file @ a9648072
......@@ -1149,7 +1149,6 @@ static void identify_cpu(struct cpuinfo_x86 *c)
detect_ht(c);
#endif
init_hypervisor(c);
x86_init_rdrand(c);
x86_init_cache_qos(c);
setup_pku(c);
......
arch/x86/kernel/cpu/hypervisor.c
View file @ a9648072
......@@ -28,8 +28,11 @@
static const __initconst struct hypervisor_x86 * const hypervisors[] =
{
#ifdef CONFIG_XEN
&x86_hyper_xen,
#ifdef CONFIG_XEN_PV
&x86_hyper_xen_pv,
#endif
#ifdef CONFIG_XEN_PVHVM
&x86_hyper_xen_hvm,
#endif
&x86_hyper_vmware,
&x86_hyper_ms_hyperv,
......@@ -60,12 +63,6 @@ detect_hypervisor_vendor(void)
pr_info("Hypervisor detected: %s\n", x86_hyper->name);
}
void init_hypervisor(struct cpuinfo_x86 *c)
{
if (x86_hyper && x86_hyper->set_cpu_features)
x86_hyper->set_cpu_features(c);
}
void __init init_hypervisor_platform(void)
{
......@@ -74,8 +71,6 @@ void __init init_hypervisor_platform(void)
if (!x86_hyper)
return;
init_hypervisor(&boot_cpu_data);
if (x86_hyper->init_platform)
x86_hyper->init_platform();
}
......
arch/x86/kernel/cpu/vmware.c
View file @ a9648072
......@@ -113,6 +113,24 @@ static void __init vmware_paravirt_ops_setup(void)
#define vmware_paravirt_ops_setup() do {} while (0)
#endif
/*
* VMware hypervisor takes care of exporting a reliable TSC to the guest.
* Still, due to timing difference when running on virtual cpus, the TSC can
* be marked as unstable in some cases. For example, the TSC sync check at
* bootup can fail due to a marginal offset between vcpus' TSCs (though the
* TSCs do not drift from each other). Also, the ACPI PM timer clocksource
* is not suitable as a watchdog when running on a hypervisor because the
* kernel may miss a wrap of the counter if the vcpu is descheduled for a
* long time. To skip these checks at runtime we set these capability bits,
* so that the kernel could just trust the hypervisor with providing a
* reliable virtual TSC that is suitable for timekeeping.
*/
static void __init vmware_set_capabilities(void)
{
setup_force_cpu_cap(X86_FEATURE_CONSTANT_TSC);
setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
}
static void __init vmware_platform_setup(void)
{
uint32_t eax, ebx, ecx, edx;
......@@ -152,6 +170,8 @@ static void __init vmware_platform_setup(void)
#ifdef CONFIG_X86_IO_APIC
no_timer_check = 1;
#endif
vmware_set_capabilities();
}
/*
......@@ -176,24 +196,6 @@ static uint32_t __init vmware_platform(void)
return 0;
}
/*
* VMware hypervisor takes care of exporting a reliable TSC to the guest.
* Still, due to timing difference when running on virtual cpus, the TSC can
* be marked as unstable in some cases. For example, the TSC sync check at
* bootup can fail due to a marginal offset between vcpus' TSCs (though the
* TSCs do not drift from each other). Also, the ACPI PM timer clocksource
* is not suitable as a watchdog when running on a hypervisor because the
* kernel may miss a wrap of the counter if the vcpu is descheduled for a
* long time. To skip these checks at runtime we set these capability bits,
* so that the kernel could just trust the hypervisor with providing a
* reliable virtual TSC that is suitable for timekeeping.
*/
static void vmware_set_cpu_features(struct cpuinfo_x86 *c)
{
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
}
/* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */
static bool __init vmware_legacy_x2apic_available(void)
{
......@@ -206,7 +208,6 @@ static bool __init vmware_legacy_x2apic_available(void)
const __refconst struct hypervisor_x86 x86_hyper_vmware = {
.name = "VMware",
.detect = vmware_platform,
.set_cpu_features = vmware_set_cpu_features,
.init_platform = vmware_platform_setup,
.x2apic_available = vmware_legacy_x2apic_available,
};
......
arch/x86/kernel/process_64.c
View file @ a9648072
......@@ -446,7 +446,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV))
__switch_to_xtra(prev_p, next_p, tss);
#ifdef CONFIG_XEN
#ifdef CONFIG_XEN_PV
/*
* On Xen PV, IOPL bits in pt_regs->flags have no effect, and
* current_pt_regs()->flags may not match the current task's
......
arch/x86/pci/xen.c
View file @ a9648072
......@@ -447,7 +447,7 @@ void __init xen_msi_init(void)
int __init pci_xen_hvm_init(void)
{
if (!xen_feature(XENFEAT_hvm_pirqs))
if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
return 0;
#ifdef CONFIG_ACPI
......
arch/x86/xen/Kconfig
View file @ a9648072
......@@ -6,8 +6,6 @@ config XEN
bool "Xen guest support"
depends on PARAVIRT
select PARAVIRT_CLOCK
select XEN_HAVE_PVMMU
select XEN_HAVE_VPMU
depends on X86_64 || (X86_32 && X86_PAE)
depends on X86_LOCAL_APIC && X86_TSC
help
......@@ -15,18 +13,41 @@ config XEN
kernel to boot in a paravirtualized environment under the
Xen hypervisor.
config XEN_DOM0
config XEN_PV
bool "Xen PV guest support"
default y
depends on XEN
select XEN_HAVE_PVMMU
select XEN_HAVE_VPMU
help
Support running as a Xen PV guest.
config XEN_PV_SMP
def_bool y
depends on XEN && PCI_XEN && SWIOTLB_XEN
depends on XEN_PV && SMP
config XEN_DOM0
bool "Xen PV Dom0 support"
default y
depends on XEN_PV && PCI_XEN && SWIOTLB_XEN
depends on X86_IO_APIC && ACPI && PCI
help
Support running as a Xen PV Dom0 guest.
config XEN_PVHVM
def_bool y
bool "Xen PVHVM guest support"
default y
depends on XEN && PCI && X86_LOCAL_APIC
help
Support running as a Xen PVHVM guest.
config XEN_PVHVM_SMP
def_bool y
depends on XEN_PVHVM && SMP
config XEN_512GB
bool "Limit Xen pv-domain memory to 512GB"
depends on XEN && X86_64
depends on XEN_PV && X86_64
default y
help
Limit paravirtualized user domains to 512GB of RAM.
......
arch/x86/xen/Makefile
View file @ a9648072
......@@ -7,17 +7,23 @@ endif
# Make sure early boot has no stackprotector
nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_enlighten.o := $(nostackp)
CFLAGS_mmu.o := $(nostackp)
CFLAGS_enlighten_pv.o := $(nostackp)
CFLAGS_mmu_pv.o := $(nostackp)
obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
obj-y := enlighten.o multicalls.o mmu.o irq.o \
time.o xen-asm.o xen-asm_$(BITS).o \
grant-table.o suspend.o platform-pci-unplug.o \
p2m.o apic.o pmu.o
grant-table.o suspend.o platform-pci-unplug.o
obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o suspend_hvm.o
obj-$(CONFIG_XEN_PV) += setup.o apic.o pmu.o suspend_pv.o \
p2m.o enlighten_pv.o mmu_pv.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_XEN_PV_SMP) += smp_pv.o
obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_DOM0) += vga.o
......
arch/x86/xen/efi.c
View file @ a9648072
......@@ -81,7 +81,7 @@ static const struct efi efi_xen __initconst = {
.update_capsule = xen_efi_update_capsule,
.query_capsule_caps = xen_efi_query_capsule_caps,
.get_next_high_mono_count = xen_efi_get_next_high_mono_count,
.reset_system = NULL, /* Functionality provided by Xen. */
.reset_system = xen_efi_reset_system,
.set_virtual_address_map = NULL, /* Not used under Xen. */
.flags = 0 /* Initialized later. */
};
......
arch/x86/xen/enlighten.c
View file @ a9648072
/*
* Core of Xen paravirt_ops implementation.
*
* This file contains the xen_paravirt_ops structure itself, and the
* implementations for:
* - privileged instructions
* - interrupt flags
* - segment operations
* - booting and setup
*
* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
*/
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/preempt.h>
#include <linux/hardirq.h>
#include <linux/percpu.h>
#include <linux/delay.h>
#include <linux/start_kernel.h>
#include <linux/sched.h>
#include <linux/kprobes.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/highmem.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/edd.h>
#include <linux/frame.h>
#include <linux/kexec.h>
#include <xen/xen.h>
#include <xen/events.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
#include <xen/interface/physdev.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/memory.h>
#include <xen/interface/nmi.h>
#include <xen/interface/xen-mca.h>
#include <xen/interface/hvm/start_info.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvm.h>
#include <xen/hvc-console.h>
#include <xen/acpi.h>
#include <asm/paravirt.h>
#include <asm/apic.h>
#include <asm/page.h>
#include <asm/xen/pci.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/cpuid.h>
#include <asm/fixmap.h>
#include <asm/processor.h>
#include <asm/proto.h>
#include <asm/msr-index.h>
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/reboot.h>
#include <asm/stackprotector.h>
#include <asm/hypervisor.h>
#include <asm/mach_traps.h>
#include <asm/mwait.h>
#include <asm/pci_x86.h>
#include <asm/cpu.h>
#include <asm/e820/api.h>
#ifdef CONFIG_ACPI
#include <linux/acpi.h>
#include <asm/acpi.h>
#include <acpi/pdc_intel.h>
#include <acpi/processor.h>
#include <xen/interface/platform.h>
#endif
#include "xen-ops.h"
#include "mmu.h"
#include "smp.h"
#include "multicalls.h"
#include "pmu.h"
EXPORT_SYMBOL_GPL(hypercall_page);
......@@ -136,13 +57,8 @@ EXPORT_SYMBOL_GPL(xen_start_info);
struct shared_info xen_dummy_shared_info;
void *xen_initial_gdt;
RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
static int xen_cpu_up_prepare(unsigned int cpu);
static int xen_cpu_up_online(unsigned int cpu);
static int xen_cpu_dead(unsigned int cpu);
__read_mostly int xen_have_vector_callback;
EXPORT_SYMBOL_GPL(xen_have_vector_callback);
/*
* Point at some empty memory to start with. We map the real shared_info
......@@ -163,34 +79,32 @@ struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
*
* 0: not available, 1: available
*/
static int have_vcpu_info_placement = 1;
int xen_have_vcpu_info_placement = 1;
struct tls_descs {
struct desc_struct desc[3];
};
static int xen_cpu_up_online(unsigned int cpu)
{
xen_init_lock_cpu(cpu);
return 0;
}
/*
* Updating the 3 TLS descriptors in the GDT on every task switch is
* surprisingly expensive so we avoid updating them if they haven't
* changed. Since Xen writes different descriptors than the one
* passed in the update_descriptor hypercall we keep shadow copies to
* compare against.
*/
static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
int (*cpu_dead_cb)(unsigned int))
{
int rc;
#ifdef CONFIG_XEN_PVH
/*
* PVH variables.
*
* xen_pvh and pvh_bootparams need to live in data segment since they
* are used after startup_{32|64}, which clear .bss, are invoked.
*/
bool xen_pvh __attribute__((section(".data"))) = 0;
struct boot_params pvh_bootparams __attribute__((section(".data")));
rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
"x86/xen/hvm_guest:prepare",
cpu_up_prepare_cb, cpu_dead_cb);
if (rc >= 0) {
rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"x86/xen/hvm_guest:online",
xen_cpu_up_online, NULL);
if (rc < 0)
cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
}
struct hvm_start_info pvh_start_info;
unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
#endif
return rc >= 0 ? 0 : rc;
}
static void clamp_max_cpus(void)
{
......@@ -227,7 +141,7 @@ void xen_vcpu_setup(int cpu)
per_cpu(xen_vcpu, cpu) =
&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
if (!have_vcpu_info_placement) {
if (!xen_have_vcpu_info_placement) {
if (cpu >= MAX_VIRT_CPUS)
clamp_max_cpus();
return;
......@@ -250,7 +164,7 @@ void xen_vcpu_setup(int cpu)
if (err) {
printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
have_vcpu_info_placement = 0;
xen_have_vcpu_info_placement = 0;
clamp_max_cpus();
} else {
/* This cpu is using the registered vcpu info, even if
......@@ -259,1768 +173,81 @@ void xen_vcpu_setup(int cpu)
}
}
/*
* On restore, set the vcpu placement up again.
* If it fails, then we're in a bad state, since
* we can't back out from using it...
*/
void xen_vcpu_restore(void)
void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };
int cpu;
for_each_possible_cpu(cpu) {
bool other_cpu = (cpu != smp_processor_id());
bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu),
NULL);
if (other_cpu && is_up &&
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
BUG();
xen_setup_runstate_info(cpu);
if (have_vcpu_info_placement)
xen_vcpu_setup(cpu);
for_each_online_cpu(cpu)
xen_pmu_finish(cpu);
if (other_cpu && is_up &&
HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
BUG();
}
}
static void __init xen_banner(void)
{
unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
struct xen_extraversion extra;
HYPERVISOR_xen_version(XENVER_extraversion, &extra);
pr_info("Booting paravirtualized kernel %son %s\n",
xen_feature(XENFEAT_auto_translated_physmap) ?
"with PVH extensions " : "", pv_info.name);
printk(KERN_INFO "Xen version: %d.%d%s%s\n",
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
}
/* Check if running on Xen version (major, minor) or later */
bool
xen_running_on_version_or_later(unsigned int major, unsigned int minor)
{
unsigned int version;
if (!xen_domain())
return false;
version = HYPERVISOR_xen_version(XENVER_version, NULL);
if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
((version >> 16) > major))
return true;
return false;
}
#define CPUID_THERM_POWER_LEAF 6
#define APERFMPERF_PRESENT 0
static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0;
static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask;
static __read_mostly unsigned int cpuid_leaf5_ecx_val;
static __read_mostly unsigned int cpuid_leaf5_edx_val;
static void xen_cpuid(unsigned int *ax, unsigned int *bx,
unsigned int *cx, unsigned int *dx)
{
unsigned maskebx = ~0;
unsigned maskecx = ~0;
unsigned maskedx = ~0;
unsigned setecx = 0;
/*
* Mask out inconvenient features, to try and disable as many
* unsupported kernel subsystems as possible.
*/
switch (*ax) {
case 1:
maskecx = cpuid_leaf1_ecx_mask;
setecx = cpuid_leaf1_ecx_set_mask;
maskedx = cpuid_leaf1_edx_mask;
break;
case CPUID_MWAIT_LEAF:
/* Synthesize the values.. */
*ax = 0;
*bx = 0;
*cx = cpuid_leaf5_ecx_val;
*dx = cpuid_leaf5_edx_val;
return;
case CPUID_THERM_POWER_LEAF:
/* Disabling APERFMPERF for kernel usage */
maskecx = ~(1 << APERFMPERF_PRESENT);
break;
case 0xb:
/* Suppress extended topology stuff */
maskebx = 0;
break;
}
asm(XEN_EMULATE_PREFIX "cpuid"
: "=a" (*ax),
"=b" (*bx),
"=c" (*cx),
"=d" (*dx)
: "0" (*ax), "2" (*cx));
*bx &= maskebx;
*cx &= maskecx;
*cx |= setecx;
*dx &= maskedx;
}
STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */
static bool __init xen_check_mwait(void)
{
#ifdef CONFIG_ACPI
struct xen_platform_op op = {
.cmd = XENPF_set_processor_pminfo,
.u.set_pminfo.id = -1,
.u.set_pminfo.type = XEN_PM_PDC,
};
uint32_t buf[3];
unsigned int ax, bx, cx, dx;
unsigned int mwait_mask;
/* We need to determine whether it is OK to expose the MWAIT
* capability to the kernel to harvest deeper than C3 states from ACPI
* _CST using the processor_harvest_xen.c module. For this to work, we
* need to gather the MWAIT_LEAF values (which the cstate.c code
* checks against). The hypervisor won't expose the MWAIT flag because
* it would break backwards compatibility; so we will find out directly
* from the hardware and hypercall.
*/
if (!xen_initial_domain())
return false;
/*
* When running under platform earlier than Xen4.2, do not expose
* mwait, to avoid the risk of loading native acpi pad driver
*/
if (!xen_running_on_version_or_later(4, 2))
return false;
ax = 1;
cx = 0;
native_cpuid(&ax, &bx, &cx, &dx);
mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
(1 << (X86_FEATURE_MWAIT % 32));
if ((cx & mwait_mask) != mwait_mask)
return false;
/* We need to emulate the MWAIT_LEAF and for that we need both
* ecx and edx. The hypercall provides only partial information.
*/
ax = CPUID_MWAIT_LEAF;
bx = 0;
cx = 0;
dx = 0;
native_cpuid(&ax, &bx, &cx, &dx);
/* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
* don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
*/
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP);
set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
if ((HYPERVISOR_platform_op(&op) == 0) &&
(buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) {
cpuid_leaf5_ecx_val = cx;
cpuid_leaf5_edx_val = dx;
}
return true;
#else
return false;
#endif
}
static void __init xen_init_cpuid_mask(void)
{
unsigned int ax, bx, cx, dx;
unsigned int xsave_mask;
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MTRR) | /* disable MTRR */
(1 << X86_FEATURE_ACC)); /* thermal monitoring */
if (!xen_initial_domain())
cpuid_leaf1_edx_mask &=
~((1 << X86_FEATURE_ACPI)); /* disable ACPI */
cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
ax = 1;
cx = 0;
cpuid(1, &ax, &bx, &cx, &dx);
xsave_mask =
(1 << (X86_FEATURE_XSAVE % 32)) |
(1 << (X86_FEATURE_OSXSAVE % 32));
/* Xen will set CR4.OSXSAVE if supported and not disabled by force */
if ((cx & xsave_mask) != xsave_mask)
cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */
if (xen_check_mwait())
cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32));
}
static void xen_set_debugreg(int reg, unsigned long val)
void xen_emergency_restart(void)
{
HYPERVISOR_set_debugreg(reg, val);
xen_reboot(SHUTDOWN_reboot);
}
static unsigned long xen_get_debugreg(int reg)
static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
return HYPERVISOR_get_debugreg(reg);
if (!kexec_crash_loaded())
xen_reboot(SHUTDOWN_crash);
return NOTIFY_DONE;
}
static void xen_end_context_switch(struct task_struct *next)
{
xen_mc_flush();
paravirt_end_context_switch(next);
}
static struct notifier_block xen_panic_block = {
.notifier_call = xen_panic_event,
.priority = INT_MIN
};
static unsigned long xen_store_tr(void)
int xen_panic_handler_init(void)
{
atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
return 0;
}
/*
* Set the page permissions for a particular virtual address. If the
* address is a vmalloc mapping (or other non-linear mapping), then
* find the linear mapping of the page and also set its protections to
* match.
*/
static void set_aliased_prot(void *v, pgprot_t prot)
{
int level;
pte_t *ptep;
pte_t pte;
unsigned long pfn;
struct page *page;
unsigned char dummy;
ptep = lookup_address((unsigned long)v, &level);
BUG_ON(ptep == NULL);
pfn = pte_pfn(*ptep);
page = pfn_to_page(pfn);
pte = pfn_pte(pfn, prot);
/*
* Careful: update_va_mapping() will fail if the virtual address
* we're poking isn't populated in the page tables. We don't
* need to worry about the direct map (that's always in the page
* tables), but we need to be careful about vmap space. In
* particular, the top level page table can lazily propagate
* entries between processes, so if we've switched mms since we
* vmapped the target in the first place, we might not have the
* top-level page table entry populated.
*
* We disable preemption because we want the same mm active when
* we probe the target and when we issue the hypercall. We'll
* have the same nominal mm, but if we're a kernel thread, lazy
* mm dropping could change our pgd.
*
* Out of an abundance of caution, this uses __get_user() to fault
* in the target address just in case there's some obscure case
* in which the target address isn't readable.
*/
preempt_disable();
probe_kernel_read(&dummy, v, 1);
if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
BUG();
if (!PageHighMem(page)) {
void *av = __va(PFN_PHYS(pfn));
if (av != v)
if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
BUG();
} else
kmap_flush_unused();
preempt_enable();
}
static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
int i;
/*
* We need to mark the all aliases of the LDT pages RO. We
* don't need to call vm_flush_aliases(), though, since that's
* only responsible for flushing aliases out the TLBs, not the
* page tables, and Xen will flush the TLB for us if needed.
*
* To avoid confusing future readers: none of this is necessary
* to load the LDT. The hypervisor only checks this when the
* LDT is faulted in due to subsequent descriptor access.
*/
for(i = 0; i < entries; i += entries_per_page)
set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
}
static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
{
const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
int i;
for(i = 0; i < entries; i += entries_per_page)
set_aliased_prot(ldt + i, PAGE_KERNEL);
}
static void xen_set_ldt(const void *addr, unsigned entries)
{
struct mmuext_op *op;
struct multicall_space mcs = xen_mc_entry(sizeof(*op));
trace_xen_cpu_set_ldt(addr, entries);
op = mcs.args;
op->cmd = MMUEXT_SET_LDT;
op->arg1.linear_addr = (unsigned long)addr;
op->arg2.nr_ents = entries;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
static void xen_load_gdt(const struct desc_ptr *dtr)
{
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
unsigned long frames[pages];
int f;
/*
* A GDT can be up to 64k in size, which corresponds to 8192
* 8-byte entries, or 16 4k pages..
*/
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
int level;
pte_t *ptep;
unsigned long pfn, mfn;
void *virt;
/*
* The GDT is per-cpu and is in the percpu data area.
* That can be virtually mapped, so we need to do a
* page-walk to get the underlying MFN for the
* hypercall. The page can also be in the kernel's
* linear range, so we need to RO that mapping too.
*/
ptep = lookup_address(va, &level);
BUG_ON(ptep == NULL);
pfn = pte_pfn(*ptep);
mfn = pfn_to_mfn(pfn);
virt = __va(PFN_PHYS(pfn));
frames[f] = mfn;
make_lowmem_page_readonly((void *)va);
make_lowmem_page_readonly(virt);
}
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
BUG();
}
/*
* load_gdt for early boot, when the gdt is only mapped once
*/
static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
{
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
unsigned long frames[pages];
int f;
/*
* A GDT can be up to 64k in size, which corresponds to 8192
* 8-byte entries, or 16 4k pages..
*/
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
pte_t pte;
unsigned long pfn, mfn;
pfn = virt_to_pfn(va);
mfn = pfn_to_mfn(pfn);
pte = pfn_pte(pfn, PAGE_KERNEL_RO);
if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0))
BUG();
frames[f] = mfn;
}
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
BUG();
}
static inline bool desc_equal(const struct desc_struct *d1,
const struct desc_struct *d2)
{
return d1->a == d2->a && d1->b == d2->b;
}
static void load_TLS_descriptor(struct thread_struct *t,
unsigned int cpu, unsigned int i)
void xen_pin_vcpu(int cpu)
{
struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
struct desc_struct *gdt;
xmaddr_t maddr;
struct multicall_space mc;
static bool disable_pinning;
struct sched_pin_override pin_override;
int ret;
if (desc_equal(shadow, &t->tls_array[i]))
if (disable_pinning)
return;
*shadow = t->tls_array[i];
gdt = get_cpu_gdt_rw(cpu);
maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
mc = __xen_mc_entry(0);
pin_override.pcpu = cpu;
ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
}
/* Ignore errors when removing override. */
if (cpu < 0)
return;
static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
{
/*
* XXX sleazy hack: If we're being called in a lazy-cpu zone
* and lazy gs handling is enabled, it means we're in a
* context switch, and %gs has just been saved. This means we
* can zero it out to prevent faults on exit from the
* hypervisor if the next process has no %gs. Either way, it
* has been saved, and the new value will get loaded properly.
* This will go away as soon as Xen has been modified to not
* save/restore %gs for normal hypercalls.
*
* On x86_64, this hack is not used for %gs, because gs points
* to KERNEL_GS_BASE (and uses it for PDA references), so we
* must not zero %gs on x86_64
*
* For x86_64, we need to zero %fs, otherwise we may get an
* exception between the new %fs descriptor being loaded and
* %fs being effectively cleared at __switch_to().
*/
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
#ifdef CONFIG_X86_32
lazy_load_gs(0);
#else
loadsegment(fs, 0);
#endif
switch (ret) {
case -ENOSYS:
pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
cpu);
disable_pinning = true;
break;
case -EPERM:
WARN(1, "Trying to pin vcpu without having privilege to do so\n");
disable_pinning = true;
break;
case -EINVAL:
case -EBUSY:
pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
cpu);
break;
case 0:
break;
default:
WARN(1, "rc %d while trying to pin vcpu\n", ret);
disable_pinning = true;
}
xen_mc_batch();
load_TLS_descriptor(t, cpu, 0);
load_TLS_descriptor(t, cpu, 1);
load_TLS_descriptor(t, cpu, 2);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
#ifdef CONFIG_X86_64
static void xen_load_gs_index(unsigned int idx)
{
if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
BUG();
}
#endif
static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
const void *ptr)
{
xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
u64 entry = *(u64 *)ptr;
trace_xen_cpu_write_ldt_entry(dt, entrynum, entry);
preempt_disable();
xen_mc_flush();
if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
BUG();
preempt_enable();
}
static int cvt_gate_to_trap(int vector, const gate_desc *val,
struct trap_info *info)
{
unsigned long addr;
if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
return 0;
info->vector = vector;
addr = gate_offset(*val);
#ifdef CONFIG_X86_64
/*
* Look for known traps using IST, and substitute them
* appropriately. The debugger ones are the only ones we care
* about. Xen will handle faults like double_fault,
* so we should never see them. Warn if
* there's an unexpected IST-using fault handler.
*/
if (addr == (unsigned long)debug)
addr = (unsigned long)xen_debug;
else if (addr == (unsigned long)int3)
addr = (unsigned long)xen_int3;
else if (addr == (unsigned long)stack_segment)
addr = (unsigned long)xen_stack_segment;
else if (addr == (unsigned long)double_fault) {
/* Don't need to handle these */
return 0;
#ifdef CONFIG_X86_MCE
} else if (addr == (unsigned long)machine_check) {
/*
* when xen hypervisor inject vMCE to guest,
* use native mce handler to handle it
*/
;
#endif
} else if (addr == (unsigned long)nmi)
/*
* Use the native version as well.
*/
;
else {
/* Some other trap using IST? */
if (WARN_ON(val->ist != 0))
return 0;
}
#endif /* CONFIG_X86_64 */
info->address = addr;
info->cs = gate_segment(*val);
info->flags = val->dpl;
/* interrupt gates clear IF */
if (val->type == GATE_INTERRUPT)
info->flags |= 1 << 2;
return 1;
}
/* Locations of each CPU's IDT */
static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
/* Set an IDT entry. If the entry is part of the current IDT, then
also update Xen. */
static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
{
unsigned long p = (unsigned long)&dt[entrynum];
unsigned long start, end;
trace_xen_cpu_write_idt_entry(dt, entrynum, g);
preempt_disable();
start = __this_cpu_read(idt_desc.address);
end = start + __this_cpu_read(idt_desc.size) + 1;
xen_mc_flush();
native_write_idt_entry(dt, entrynum, g);
if (p >= start && (p + 8) <= end) {
struct trap_info info[2];
info[1].address = 0;
if (cvt_gate_to_trap(entrynum, g, &info[0]))
if (HYPERVISOR_set_trap_table(info))
BUG();
}
preempt_enable();
}
static void xen_convert_trap_info(const struct desc_ptr *desc,
struct trap_info *traps)
{
unsigned in, out, count;
count = (desc->size+1) / sizeof(gate_desc);
BUG_ON(count > 256);
for (in = out = 0; in < count; in++) {
gate_desc *entry = (gate_desc*)(desc->address) + in;
if (cvt_gate_to_trap(in, entry, &traps[out]))
out++;
}
traps[out].address = 0;
}
void xen_copy_trap_info(struct trap_info *traps)
{
const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
xen_convert_trap_info(desc, traps);
}
/* Load a new IDT into Xen. In principle this can be per-CPU, so we
hold a spinlock to protect the static traps[] array (static because
it avoids allocation, and saves stack space). */
static void xen_load_idt(const struct desc_ptr *desc)
{
static DEFINE_SPINLOCK(lock);
static struct trap_info traps[257];
trace_xen_cpu_load_idt(desc);
spin_lock(&lock);
memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
xen_convert_trap_info(desc, traps);
xen_mc_flush();
if (HYPERVISOR_set_trap_table(traps))
BUG();
spin_unlock(&lock);
}
/* Write a GDT descriptor entry. Ignore LDT descriptors, since
they're handled differently. */
static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
const void *desc, int type)
{
trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
preempt_disable();
switch (type) {
case DESC_LDT:
case DESC_TSS:
/* ignore */
break;
default: {
xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
xen_mc_flush();
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
BUG();
}
}
preempt_enable();
}
/*
* Version of write_gdt_entry for use at early boot-time needed to
* update an entry as simply as possible.
*/
static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
const void *desc, int type)
{
trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
switch (type) {
case DESC_LDT:
case DESC_TSS:
/* ignore */
break;
default: {
xmaddr_t maddr = virt_to_machine(&dt[entry]);
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
dt[entry] = *(struct desc_struct *)desc;
}
}
}
static void xen_load_sp0(struct tss_struct *tss,
struct thread_struct *thread)
{
struct multicall_space mcs;
mcs = xen_mc_entry(0);
MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
xen_mc_issue(PARAVIRT_LAZY_CPU);
tss->x86_tss.sp0 = thread->sp0;
}
void xen_set_iopl_mask(unsigned mask)
{
struct physdev_set_iopl set_iopl;
/* Force the change at ring 0. */
set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
}
static void xen_io_delay(void)
{
}
static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
static unsigned long xen_read_cr0(void)
{
unsigned long cr0 = this_cpu_read(xen_cr0_value);
if (unlikely(cr0 == 0)) {
cr0 = native_read_cr0();
this_cpu_write(xen_cr0_value, cr0);
}
return cr0;
}
static void xen_write_cr0(unsigned long cr0)
{
struct multicall_space mcs;
this_cpu_write(xen_cr0_value, cr0);
/* Only pay attention to cr0.TS; everything else is
ignored. */
mcs = xen_mc_entry(0);
MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
static void xen_write_cr4(unsigned long cr4)
{
cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
native_write_cr4(cr4);
}
#ifdef CONFIG_X86_64
static inline unsigned long xen_read_cr8(void)
{
return 0;
}
static inline void xen_write_cr8(unsigned long val)
{
BUG_ON(val);
}
#endif
static u64 xen_read_msr_safe(unsigned int msr, int *err)
{
u64 val;
if (pmu_msr_read(msr, &val, err))
return val;
val = native_read_msr_safe(msr, err);
switch (msr) {
case MSR_IA32_APICBASE:
#ifdef CONFIG_X86_X2APIC
if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
#endif
val &= ~X2APIC_ENABLE;
break;
}
return val;
}
static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
{
int ret;
ret = 0;
switch (msr) {
#ifdef CONFIG_X86_64
unsigned which;
u64 base;
case MSR_FS_BASE: which = SEGBASE_FS; goto set;
case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
set:
base = ((u64)high << 32) | low;
if (HYPERVISOR_set_segment_base(which, base) != 0)
ret = -EIO;
break;
#endif
case MSR_STAR:
case MSR_CSTAR:
case MSR_LSTAR:
case MSR_SYSCALL_MASK:
case MSR_IA32_SYSENTER_CS:
case MSR_IA32_SYSENTER_ESP:
case MSR_IA32_SYSENTER_EIP:
/* Fast syscall setup is all done in hypercalls, so
these are all ignored. Stub them out here to stop
Xen console noise. */
break;
default:
if (!pmu_msr_write(msr, low, high, &ret))
ret = native_write_msr_safe(msr, low, high);
}
return ret;
}
static u64 xen_read_msr(unsigned int msr)
{
/*
* This will silently swallow a #GP from RDMSR. It may be worth
* changing that.
*/
int err;
return xen_read_msr_safe(msr, &err);
}
static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
{
/*
* This will silently swallow a #GP from WRMSR. It may be worth
* changing that.
*/
xen_write_msr_safe(msr, low, high);
}
void xen_setup_shared_info(void)
{
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
set_fixmap(FIX_PARAVIRT_BOOTMAP,
xen_start_info->shared_info);
HYPERVISOR_shared_info =
(struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
} else
HYPERVISOR_shared_info =
(struct shared_info *)__va(xen_start_info->shared_info);
#ifndef CONFIG_SMP
/* In UP this is as good a place as any to set up shared info */
xen_setup_vcpu_info_placement();
#endif
xen_setup_mfn_list_list();
}
/* This is called once we have the cpu_possible_mask */
void xen_setup_vcpu_info_placement(void)
{
int cpu;
for_each_possible_cpu(cpu) {
/* Set up direct vCPU id mapping for PV guests. */
per_cpu(xen_vcpu_id, cpu) = cpu;
xen_vcpu_setup(cpu);
}
/*
* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it.
*/
if (have_vcpu_info_placement) {
pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct);
pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
}
}
static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
unsigned long addr, unsigned len)
{
char *start, *end, *reloc;
unsigned ret;
start = end = reloc = NULL;
#define SITE(op, x) \
case PARAVIRT_PATCH(op.x): \
if (have_vcpu_info_placement) { \
start = (char *)xen_##x##_direct; \
end = xen_##x##_direct_end; \
reloc = xen_##x##_direct_reloc; \
} \
goto patch_site
switch (type) {
SITE(pv_irq_ops, irq_enable);
SITE(pv_irq_ops, irq_disable);
SITE(pv_irq_ops, save_fl);
SITE(pv_irq_ops, restore_fl);
#undef SITE
patch_site:
if (start == NULL || (end-start) > len)
goto default_patch;
ret = paravirt_patch_insns(insnbuf, len, start, end);
/* Note: because reloc is assigned from something that
appears to be an array, gcc assumes it's non-null,
but doesn't know its relationship with start and
end. */
if (reloc > start && reloc < end) {
int reloc_off = reloc - start;
long *relocp = (long *)(insnbuf + reloc_off);
long delta = start - (char *)addr;
*relocp += delta;
}
break;
default_patch:
default:
ret = paravirt_patch_default(type, clobbers, insnbuf,
addr, len);
break;
}
return ret;
}
static const struct pv_info xen_info __initconst = {
.shared_kernel_pmd = 0,
#ifdef CONFIG_X86_64
.extra_user_64bit_cs = FLAT_USER_CS64,
#endif
.name = "Xen",
};
static const struct pv_init_ops xen_init_ops __initconst = {
.patch = xen_patch,
};
static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.cpuid = xen_cpuid,
.set_debugreg = xen_set_debugreg,
.get_debugreg = xen_get_debugreg,
.read_cr0 = xen_read_cr0,
.write_cr0 = xen_write_cr0,
.read_cr4 = native_read_cr4,
.write_cr4 = xen_write_cr4,
#ifdef CONFIG_X86_64
.read_cr8 = xen_read_cr8,
.write_cr8 = xen_write_cr8,
#endif
.wbinvd = native_wbinvd,
.read_msr = xen_read_msr,
.write_msr = xen_write_msr,
.read_msr_safe = xen_read_msr_safe,
.write_msr_safe = xen_write_msr_safe,
.read_pmc = xen_read_pmc,
.iret = xen_iret,
#ifdef CONFIG_X86_64
.usergs_sysret64 = xen_sysret64,
#endif
.load_tr_desc = paravirt_nop,
.set_ldt = xen_set_ldt,
.load_gdt = xen_load_gdt,
.load_idt = xen_load_idt,
.load_tls = xen_load_tls,
#ifdef CONFIG_X86_64
.load_gs_index = xen_load_gs_index,
#endif
.alloc_ldt = xen_alloc_ldt,
.free_ldt = xen_free_ldt,
.store_idt = native_store_idt,
.store_tr = xen_store_tr,
.write_ldt_entry = xen_write_ldt_entry,
.write_gdt_entry = xen_write_gdt_entry,
.write_idt_entry = xen_write_idt_entry,
.load_sp0 = xen_load_sp0,
.set_iopl_mask = xen_set_iopl_mask,
.io_delay = xen_io_delay,
/* Xen takes care of %gs when switching to usermode for us */
.swapgs = paravirt_nop,
.start_context_switch = paravirt_start_context_switch,
.end_context_switch = xen_end_context_switch,
};
static void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };
int cpu;
for_each_online_cpu(cpu)
xen_pmu_finish(cpu);
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
BUG();
}
static void xen_restart(char *msg)
{
xen_reboot(SHUTDOWN_reboot);
}
static void xen_emergency_restart(void)
{
xen_reboot(SHUTDOWN_reboot);
}
static void xen_machine_halt(void)
{
xen_reboot(SHUTDOWN_poweroff);
}
static void xen_machine_power_off(void)
{
if (pm_power_off)
pm_power_off();
xen_reboot(SHUTDOWN_poweroff);
}
static void xen_crash_shutdown(struct pt_regs *regs)
{
xen_reboot(SHUTDOWN_crash);
}
static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
if (!kexec_crash_loaded())
xen_reboot(SHUTDOWN_crash);
return NOTIFY_DONE;
}
static struct notifier_block xen_panic_block = {
.notifier_call= xen_panic_event,
.priority = INT_MIN
};
int xen_panic_handler_init(void)
{
atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
return 0;
}
static const struct machine_ops xen_machine_ops __initconst = {
.restart = xen_restart,
.halt = xen_machine_halt,
.power_off = xen_machine_power_off,
.shutdown = xen_machine_halt,
.crash_shutdown = xen_crash_shutdown,
.emergency_restart = xen_emergency_restart,
};
static unsigned char xen_get_nmi_reason(void)
{
unsigned char reason = 0;
/* Construct a value which looks like it came from port 0x61. */
if (test_bit(_XEN_NMIREASON_io_error,
&HYPERVISOR_shared_info->arch.nmi_reason))
reason |= NMI_REASON_IOCHK;
if (test_bit(_XEN_NMIREASON_pci_serr,
&HYPERVISOR_shared_info->arch.nmi_reason))
reason |= NMI_REASON_SERR;
return reason;
}
static void __init xen_boot_params_init_edd(void)
{
#if IS_ENABLED(CONFIG_EDD)
struct xen_platform_op op;
struct edd_info *edd_info;
u32 *mbr_signature;
unsigned nr;
int ret;
edd_info = boot_params.eddbuf;
mbr_signature = boot_params.edd_mbr_sig_buffer;
op.cmd = XENPF_firmware_info;
op.u.firmware_info.type = XEN_FW_DISK_INFO;
for (nr = 0; nr < EDDMAXNR; nr++) {
struct edd_info *info = edd_info + nr;
op.u.firmware_info.index = nr;
info->params.length = sizeof(info->params);
set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
&info->params);
ret = HYPERVISOR_platform_op(&op);
if (ret)
break;
#define C(x) info->x = op.u.firmware_info.u.disk_info.x
C(device);
C(version);
C(interface_support);
C(legacy_max_cylinder);
C(legacy_max_head);
C(legacy_sectors_per_track);
#undef C
}
boot_params.eddbuf_entries = nr;
op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
op.u.firmware_info.index = nr;
ret = HYPERVISOR_platform_op(&op);
if (ret)
break;
mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
}
boot_params.edd_mbr_sig_buf_entries = nr;
#endif
}
/*
* Set up the GDT and segment registers for -fstack-protector. Until
* we do this, we have to be careful not to call any stack-protected
* function, which is most of the kernel.
*/
static void xen_setup_gdt(int cpu)
{
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
pv_cpu_ops.load_gdt = xen_load_gdt_boot;
setup_stack_canary_segment(0);
switch_to_new_gdt(0);
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry;
pv_cpu_ops.load_gdt = xen_load_gdt;
}
static void __init xen_dom0_set_legacy_features(void)
{
x86_platform.legacy.rtc = 1;
}
static int xen_cpuhp_setup(void)
{
int rc;
rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
"x86/xen/hvm_guest:prepare",
xen_cpu_up_prepare, xen_cpu_dead);
if (rc >= 0) {
rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"x86/xen/hvm_guest:online",
xen_cpu_up_online, NULL);
if (rc < 0)
cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
}
return rc >= 0 ? 0 : rc;
}
/* First C function to be called on Xen boot */
asmlinkage __visible void __init xen_start_kernel(void)
{
struct physdev_set_iopl set_iopl;
unsigned long initrd_start = 0;
int rc;
if (!xen_start_info)
return;
xen_domain_type = XEN_PV_DOMAIN;
xen_setup_features();
xen_setup_machphys_mapping();
/* Install Xen paravirt ops */
pv_info = xen_info;
pv_init_ops = xen_init_ops;
pv_cpu_ops = xen_cpu_ops;
x86_platform.get_nmi_reason = xen_get_nmi_reason;
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.oem.arch_setup = xen_arch_setup;
x86_init.oem.banner = xen_banner;
xen_init_time_ops();
/*
* Set up some pagetable state before starting to set any ptes.
*/
xen_init_mmu_ops();
/* Prevent unwanted bits from being set in PTEs. */
__supported_pte_mask &= ~_PAGE_GLOBAL;
/*
* Prevent page tables from being allocated in highmem, even
* if CONFIG_HIGHPTE is enabled.
*/
__userpte_alloc_gfp &= ~__GFP_HIGHMEM;
/* Work out if we support NX */
x86_configure_nx();
/* Get mfn list */
xen_build_dynamic_phys_to_machine();
/*
* Set up kernel GDT and segment registers, mainly so that
* -fstack-protector code can be executed.
*/
xen_setup_gdt(0);
xen_init_irq_ops();
xen_init_cpuid_mask();
#ifdef CONFIG_X86_LOCAL_APIC
/*
* set up the basic apic ops.
*/
xen_init_apic();
#endif
if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
}
machine_ops = xen_machine_ops;
/*
* The only reliable way to retain the initial address of the
* percpu gdt_page is to remember it here, so we can go and
* mark it RW later, when the initial percpu area is freed.
*/
xen_initial_gdt = &per_cpu(gdt_page, 0);
xen_smp_init();
#ifdef CONFIG_ACPI_NUMA
/*
* The pages we from Xen are not related to machine pages, so
* any NUMA information the kernel tries to get from ACPI will
* be meaningless. Prevent it from trying.
*/
acpi_numa = -1;
#endif
/* Don't do the full vcpu_info placement stuff until we have a
possible map and a non-dummy shared_info. */
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
WARN_ON(xen_cpuhp_setup());
local_irq_disable();
early_boot_irqs_disabled = true;
xen_raw_console_write("mapping kernel into physical memory\n");
xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base,
xen_start_info->nr_pages);
xen_reserve_special_pages();
/* keep using Xen gdt for now; no urgent need to change it */
#ifdef CONFIG_X86_32
pv_info.kernel_rpl = 1;
if (xen_feature(XENFEAT_supervisor_mode_kernel))
pv_info.kernel_rpl = 0;
#else
pv_info.kernel_rpl = 0;
#endif
/* set the limit of our address space */
xen_reserve_top();
/*
* We used to do this in xen_arch_setup, but that is too late
* on AMD were early_cpu_init (run before ->arch_setup()) calls
* early_amd_init which pokes 0xcf8 port.
*/
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
#ifdef CONFIG_X86_32
/* set up basic CPUID stuff */
cpu_detect(&new_cpu_data);
set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
new_cpu_data.x86_capability[CPUID_1_EDX] = cpuid_edx(1);
#endif
if (xen_start_info->mod_start) {
if (xen_start_info->flags & SIF_MOD_START_PFN)
initrd_start = PFN_PHYS(xen_start_info->mod_start);
else
initrd_start = __pa(xen_start_info->mod_start);
}
/* Poke various useful things into boot_params */
boot_params.hdr.type_of_loader = (9 << 4) | 0;
boot_params.hdr.ramdisk_image = initrd_start;
boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
if (!xen_initial_domain()) {
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
if (pci_xen)
x86_init.pci.arch_init = pci_xen_init;
} else {
const struct dom0_vga_console_info *info =
(void *)((char *)xen_start_info +
xen_start_info->console.dom0.info_off);
struct xen_platform_op op = {
.cmd = XENPF_firmware_info,
.interface_version = XENPF_INTERFACE_VERSION,
.u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS,
};
x86_platform.set_legacy_features =
xen_dom0_set_legacy_features;
xen_init_vga(info, xen_start_info->console.dom0.info_size);
xen_start_info->console.domU.mfn = 0;
xen_start_info->console.domU.evtchn = 0;
if (HYPERVISOR_platform_op(&op) == 0)
boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags;
/* Make sure ACS will be enabled */
pci_request_acs();
xen_acpi_sleep_register();
/* Avoid searching for BIOS MP tables */
x86_init.mpparse.find_smp_config = x86_init_noop;
x86_init.mpparse.get_smp_config = x86_init_uint_noop;
xen_boot_params_init_edd();
}
#ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */
pci_probe &= ~PCI_PROBE_BIOS;
#endif
xen_raw_console_write("about to get started...\n");
/* Let's presume PV guests always boot on vCPU with id 0. */
per_cpu(xen_vcpu_id, 0) = 0;
xen_setup_runstate_info(0);
xen_efi_init();
/* Start the world */
#ifdef CONFIG_X86_32
i386_start_kernel();
#else
cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
x86_64_start_reservations((char *)__pa_symbol(&boot_params));
#endif
}
#ifdef CONFIG_XEN_PVH
static void xen_pvh_arch_setup(void)
{
#ifdef CONFIG_ACPI
/* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
if (nr_ioapics == 0)
acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
#endif
}
static void __init init_pvh_bootparams(void)
{
struct xen_memory_map memmap;
unsigned int i;
int rc;
memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_table);
set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_table);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc) {
xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
BUG();
}
if (memmap.nr_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) {
pvh_bootparams.e820_table[memmap.nr_entries].addr =
ISA_START_ADDRESS;
pvh_bootparams.e820_table[memmap.nr_entries].size =
ISA_END_ADDRESS - ISA_START_ADDRESS;
pvh_bootparams.e820_table[memmap.nr_entries].type =
E820_TYPE_RESERVED;
memmap.nr_entries++;
} else
xen_raw_printk("Warning: Can fit ISA range into e820\n");
pvh_bootparams.e820_entries = memmap.nr_entries;
for (i = 0; i < pvh_bootparams.e820_entries; i++)
e820__range_add(pvh_bootparams.e820_table[i].addr,
pvh_bootparams.e820_table[i].size,
pvh_bootparams.e820_table[i].type);
e820__update_table(e820_table);
pvh_bootparams.hdr.cmd_line_ptr =
pvh_start_info.cmdline_paddr;
/* The first module is always ramdisk. */
if (pvh_start_info.nr_modules) {
struct hvm_modlist_entry *modaddr =
__va(pvh_start_info.modlist_paddr);
pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
pvh_bootparams.hdr.ramdisk_size = modaddr->size;
}
/*
* See Documentation/x86/boot.txt.
*
* Version 2.12 supports Xen entry point but we will use default x86/PC
* environment (i.e. hardware_subarch 0).
*/
pvh_bootparams.hdr.version = 0x212;
pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
}
/*
* This routine (and those that it might call) should not use
* anything that lives in .bss since that segment will be cleared later.
*/
void __init xen_prepare_pvh(void)
{
u32 msr;
u64 pfn;
if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
pvh_start_info.magic);
BUG();
}
xen_pvh = 1;
msr = cpuid_ebx(xen_cpuid_base() + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
init_pvh_bootparams();
x86_init.oem.arch_setup = xen_pvh_arch_setup;
}
#endif
void __ref xen_hvm_init_shared_info(void)
{
int cpu;
struct xen_add_to_physmap xatp;
static struct shared_info *shared_info_page = 0;
if (!shared_info_page)
shared_info_page = (struct shared_info *)
extend_brk(PAGE_SIZE, PAGE_SIZE);
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
* page, we use it in the event channel upcall and in some pvclock
* related functions. We don't need the vcpu_info placement
* optimizations because we don't use any pv_mmu or pv_irq op on
* HVM.
* When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
* online but xen_hvm_init_shared_info is run at resume time too and
* in that case multiple vcpus might be online. */
for_each_online_cpu(cpu) {
/* Leave it to be NULL. */
if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
continue;
per_cpu(xen_vcpu, cpu) =
&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
}
}
#ifdef CONFIG_XEN_PVHVM
static void __init init_hvm_pv_info(void)
{
int major, minor;
uint32_t eax, ebx, ecx, edx, base;
base = xen_cpuid_base();
eax = cpuid_eax(base + 1);
major = eax >> 16;
minor = eax & 0xffff;
printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
xen_domain_type = XEN_HVM_DOMAIN;
/* PVH set up hypercall page in xen_prepare_pvh(). */
if (xen_pvh_domain())
pv_info.name = "Xen PVH";
else {
u64 pfn;
uint32_t msr;
pv_info.name = "Xen HVM";
msr = cpuid_ebx(base + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
}
xen_setup_features();
cpuid(base + 4, &eax, &ebx, &ecx, &edx);
if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
this_cpu_write(xen_vcpu_id, ebx);
else
this_cpu_write(xen_vcpu_id, smp_processor_id());
}
#endif
static int xen_cpu_up_prepare(unsigned int cpu)
{
int rc;
if (xen_hvm_domain()) {
/*
* This can happen if CPU was offlined earlier and
* offlining timed out in common_cpu_die().
*/
if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
}
if (cpu_acpi_id(cpu) != U32_MAX)
per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
else
per_cpu(xen_vcpu_id, cpu) = cpu;
xen_vcpu_setup(cpu);
}
if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
xen_setup_timer(cpu);
rc = xen_smp_intr_init(cpu);
if (rc) {
WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
cpu, rc);
return rc;
}
return 0;
}
static int xen_cpu_dead(unsigned int cpu)
{
xen_smp_intr_free(cpu);
if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
xen_teardown_timer(cpu);
return 0;
}
static int xen_cpu_up_online(unsigned int cpu)
{
xen_init_lock_cpu(cpu);
return 0;
}
#ifdef CONFIG_XEN_PVHVM
#ifdef CONFIG_KEXEC_CORE
static void xen_hvm_shutdown(void)
{
native_machine_shutdown();
if (kexec_in_progress)
xen_reboot(SHUTDOWN_soft_reset);
}
static void xen_hvm_crash_shutdown(struct pt_regs *regs)
{
native_machine_crash_shutdown(regs);
xen_reboot(SHUTDOWN_soft_reset);
}
#endif
static void __init xen_hvm_guest_init(void)
{
if (xen_pv_domain())
return;
init_hvm_pv_info();
xen_hvm_init_shared_info();
xen_panic_handler_init();
BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
xen_hvm_smp_init();
WARN_ON(xen_cpuhp_setup());
xen_unplug_emulated_devices();
x86_init.irqs.intr_init = xen_init_IRQ;
xen_hvm_init_time_ops();
xen_hvm_init_mmu_ops();
if (xen_pvh_domain())
machine_ops.emergency_restart = xen_emergency_restart;
#ifdef CONFIG_KEXEC_CORE
machine_ops.shutdown = xen_hvm_shutdown;
machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
#endif
}
#endif
static bool xen_nopv = false;
static __init int xen_parse_nopv(char *arg)
{
xen_nopv = true;
return 0;
}
early_param("xen_nopv", xen_parse_nopv);
static uint32_t __init xen_platform(void)
{
if (xen_nopv)
return 0;
return xen_cpuid_base();
}
bool xen_hvm_need_lapic(void)
{
if (xen_nopv)
return false;
if (xen_pv_domain())
return false;
if (!xen_hvm_domain())
return false;
if (xen_feature(XENFEAT_hvm_pirqs))
return false;
return true;
}
EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
static void xen_set_cpu_features(struct cpuinfo_x86 *c)
{
if (xen_pv_domain()) {
clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
set_cpu_cap(c, X86_FEATURE_XENPV);
}
}
static void xen_pin_vcpu(int cpu)
{
static bool disable_pinning;
struct sched_pin_override pin_override;
int ret;
if (disable_pinning)
return;
pin_override.pcpu = cpu;
ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
/* Ignore errors when removing override. */
if (cpu < 0)
return;
switch (ret) {
case -ENOSYS:
pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
cpu);
disable_pinning = true;
break;
case -EPERM:
WARN(1, "Trying to pin vcpu without having privilege to do so\n");
disable_pinning = true;
break;
case -EINVAL:
case -EBUSY:
pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
cpu);
break;
case 0:
break;
default:
WARN(1, "rc %d while trying to pin vcpu\n", ret);
disable_pinning = true;
}
}
const struct hypervisor_x86 x86_hyper_xen = {
.name = "Xen",
.detect = xen_platform,
#ifdef CONFIG_XEN_PVHVM
.init_platform = xen_hvm_guest_init,
#endif
.x2apic_available = xen_x2apic_para_available,
.set_cpu_features = xen_set_cpu_features,
.pin_vcpu = xen_pin_vcpu,
};
EXPORT_SYMBOL(x86_hyper_xen);
#ifdef CONFIG_HOTPLUG_CPU
void xen_arch_register_cpu(int num)
{
......
arch/x86/xen/enlighten_hvm.c 0 → 100644
View file @ a9648072
#include <linux/cpu.h>
#include <linux/kexec.h>
#include <xen/features.h>
#include <xen/events.h>
#include <xen/interface/memory.h>
#include <asm/cpu.h>
#include <asm/smp.h>
#include <asm/reboot.h>
#include <asm/setup.h>
#include <asm/hypervisor.h>
#include <asm/xen/cpuid.h>
#include <asm/xen/hypervisor.h>
#include "xen-ops.h"
#include "mmu.h"
#include "smp.h"
void __ref xen_hvm_init_shared_info(void)
{
int cpu;
struct xen_add_to_physmap xatp;
static struct shared_info *shared_info_page;
if (!shared_info_page)
shared_info_page = (struct shared_info *)
extend_brk(PAGE_SIZE, PAGE_SIZE);
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
* page, we use it in the event channel upcall and in some pvclock
* related functions. We don't need the vcpu_info placement
* optimizations because we don't use any pv_mmu or pv_irq op on
* HVM.
* When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
* online but xen_hvm_init_shared_info is run at resume time too and
* in that case multiple vcpus might be online. */
for_each_online_cpu(cpu) {
/* Leave it to be NULL. */
if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
continue;
per_cpu(xen_vcpu, cpu) =
&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
}
}
static void __init init_hvm_pv_info(void)
{
int major, minor;
uint32_t eax, ebx, ecx, edx, base;
base = xen_cpuid_base();
eax = cpuid_eax(base + 1);
major = eax >> 16;
minor = eax & 0xffff;
printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
xen_domain_type = XEN_HVM_DOMAIN;
/* PVH set up hypercall page in xen_prepare_pvh(). */
if (xen_pvh_domain())
pv_info.name = "Xen PVH";
else {
u64 pfn;
uint32_t msr;
pv_info.name = "Xen HVM";
msr = cpuid_ebx(base + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
}
xen_setup_features();
cpuid(base + 4, &eax, &ebx, &ecx, &edx);
if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
this_cpu_write(xen_vcpu_id, ebx);
else
this_cpu_write(xen_vcpu_id, smp_processor_id());
}
#ifdef CONFIG_KEXEC_CORE
static void xen_hvm_shutdown(void)
{
native_machine_shutdown();
if (kexec_in_progress)
xen_reboot(SHUTDOWN_soft_reset);
}
static void xen_hvm_crash_shutdown(struct pt_regs *regs)
{
native_machine_crash_shutdown(regs);
xen_reboot(SHUTDOWN_soft_reset);
}
#endif
static int xen_cpu_up_prepare_hvm(unsigned int cpu)
{
int rc;
/*
* This can happen if CPU was offlined earlier and
* offlining timed out in common_cpu_die().
*/
if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
}
if (cpu_acpi_id(cpu) != U32_MAX)
per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
else
per_cpu(xen_vcpu_id, cpu) = cpu;
xen_vcpu_setup(cpu);
if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
xen_setup_timer(cpu);
rc = xen_smp_intr_init(cpu);
if (rc) {
WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
cpu, rc);
return rc;
}
return 0;
}
static int xen_cpu_dead_hvm(unsigned int cpu)
{
xen_smp_intr_free(cpu);
if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
xen_teardown_timer(cpu);
return 0;
}
static void __init xen_hvm_guest_init(void)
{
if (xen_pv_domain())
return;
init_hvm_pv_info();
xen_hvm_init_shared_info();
xen_panic_handler_init();
if (xen_feature(XENFEAT_hvm_callback_vector))
xen_have_vector_callback = 1;
xen_hvm_smp_init();
WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
xen_unplug_emulated_devices();
x86_init.irqs.intr_init = xen_init_IRQ;
xen_hvm_init_time_ops();
xen_hvm_init_mmu_ops();
if (xen_pvh_domain())
machine_ops.emergency_restart = xen_emergency_restart;
#ifdef CONFIG_KEXEC_CORE
machine_ops.shutdown = xen_hvm_shutdown;
machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
#endif
}
static bool xen_nopv;
static __init int xen_parse_nopv(char *arg)
{
xen_nopv = true;
return 0;
}
early_param("xen_nopv", xen_parse_nopv);
bool xen_hvm_need_lapic(void)
{
if (xen_nopv)
return false;
if (xen_pv_domain())
return false;
if (!xen_hvm_domain())
return false;
if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback)
return false;
return true;
}
EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
static uint32_t __init xen_platform_hvm(void)
{
if (xen_pv_domain() || xen_nopv)
return 0;
return xen_cpuid_base();
}
const struct hypervisor_x86 x86_hyper_xen_hvm = {
.name = "Xen HVM",
.detect = xen_platform_hvm,
.init_platform = xen_hvm_guest_init,
.pin_vcpu = xen_pin_vcpu,
.x2apic_available = xen_x2apic_para_available,
};
EXPORT_SYMBOL(x86_hyper_xen_hvm);
arch/x86/xen/enlighten_pv.c 0 → 100644
View file @ a9648072
/*
* Core of Xen paravirt_ops implementation.
*
* This file contains the xen_paravirt_ops structure itself, and the
* implementations for:
* - privileged instructions
* - interrupt flags
* - segment operations
* - booting and setup
*
* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
*/
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/preempt.h>
#include <linux/hardirq.h>
#include <linux/percpu.h>
#include <linux/delay.h>
#include <linux/start_kernel.h>
#include <linux/sched.h>
#include <linux/kprobes.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/highmem.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/edd.h>
#include <linux/frame.h>
#include <xen/xen.h>
#include <xen/events.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
#include <xen/interface/physdev.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/memory.h>
#include <xen/interface/nmi.h>
#include <xen/interface/xen-mca.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvc-console.h>
#include <xen/acpi.h>
#include <asm/paravirt.h>
#include <asm/apic.h>
#include <asm/page.h>
#include <asm/xen/pci.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/cpuid.h>
#include <asm/fixmap.h>
#include <asm/processor.h>
#include <asm/proto.h>
#include <asm/msr-index.h>
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/reboot.h>
#include <asm/stackprotector.h>
#include <asm/hypervisor.h>
#include <asm/mach_traps.h>
#include <asm/mwait.h>
#include <asm/pci_x86.h>
#include <asm/cpu.h>
#ifdef CONFIG_ACPI
#include <linux/acpi.h>
#include <asm/acpi.h>
#include <acpi/pdc_intel.h>
#include <acpi/processor.h>
#include <xen/interface/platform.h>
#endif
#include "xen-ops.h"
#include "mmu.h"
#include "smp.h"
#include "multicalls.h"
#include "pmu.h"
void *xen_initial_gdt;
RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
static int xen_cpu_up_prepare_pv(unsigned int cpu);
static int xen_cpu_dead_pv(unsigned int cpu);
struct tls_descs {
struct desc_struct desc[3];
};
/*
* Updating the 3 TLS descriptors in the GDT on every task switch is
* surprisingly expensive so we avoid updating them if they haven't
* changed. Since Xen writes different descriptors than the one
* passed in the update_descriptor hypercall we keep shadow copies to
* compare against.
*/
static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
/*
* On restore, set the vcpu placement up again.
* If it fails, then we're in a bad state, since
* we can't back out from using it...
*/
void xen_vcpu_restore(void)
{
int cpu;
for_each_possible_cpu(cpu) {
bool other_cpu = (cpu != smp_processor_id());
bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu),
NULL);
if (other_cpu && is_up &&
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
BUG();
xen_setup_runstate_info(cpu);
if (xen_have_vcpu_info_placement)
xen_vcpu_setup(cpu);
if (other_cpu && is_up &&
HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
BUG();
}
}
static void __init xen_banner(void)
{
unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
struct xen_extraversion extra;
HYPERVISOR_xen_version(XENVER_extraversion, &extra);
pr_info("Booting paravirtualized kernel %son %s\n",
xen_feature(XENFEAT_auto_translated_physmap) ?
"with PVH extensions " : "", pv_info.name);
printk(KERN_INFO "Xen version: %d.%d%s%s\n",
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
}
/* Check if running on Xen version (major, minor) or later */
bool
xen_running_on_version_or_later(unsigned int major, unsigned int minor)
{
unsigned int version;
if (!xen_domain())
return false;
version = HYPERVISOR_xen_version(XENVER_version, NULL);
if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
((version >> 16) > major))
return true;
return false;
}
static __read_mostly unsigned int cpuid_leaf5_ecx_val;
static __read_mostly unsigned int cpuid_leaf5_edx_val;
static void xen_cpuid(unsigned int *ax, unsigned int *bx,
unsigned int *cx, unsigned int *dx)
{
unsigned maskebx = ~0;
/*
* Mask out inconvenient features, to try and disable as many
* unsupported kernel subsystems as possible.
*/
switch (*ax) {
case CPUID_MWAIT_LEAF:
/* Synthesize the values.. */
*ax = 0;
*bx = 0;
*cx = cpuid_leaf5_ecx_val;
*dx = cpuid_leaf5_edx_val;
return;
case 0xb:
/* Suppress extended topology stuff */
maskebx = 0;
break;
}
asm(XEN_EMULATE_PREFIX "cpuid"
: "=a" (*ax),
"=b" (*bx),
"=c" (*cx),
"=d" (*dx)
: "0" (*ax), "2" (*cx));
*bx &= maskebx;
}
STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */
static bool __init xen_check_mwait(void)
{
#ifdef CONFIG_ACPI
struct xen_platform_op op = {
.cmd = XENPF_set_processor_pminfo,
.u.set_pminfo.id = -1,
.u.set_pminfo.type = XEN_PM_PDC,
};
uint32_t buf[3];
unsigned int ax, bx, cx, dx;
unsigned int mwait_mask;
/* We need to determine whether it is OK to expose the MWAIT
* capability to the kernel to harvest deeper than C3 states from ACPI
* _CST using the processor_harvest_xen.c module. For this to work, we
* need to gather the MWAIT_LEAF values (which the cstate.c code
* checks against). The hypervisor won't expose the MWAIT flag because
* it would break backwards compatibility; so we will find out directly
* from the hardware and hypercall.
*/
if (!xen_initial_domain())
return false;
/*
* When running under platform earlier than Xen4.2, do not expose
* mwait, to avoid the risk of loading native acpi pad driver
*/
if (!xen_running_on_version_or_later(4, 2))
return false;
ax = 1;
cx = 0;
native_cpuid(&ax, &bx, &cx, &dx);
mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
(1 << (X86_FEATURE_MWAIT % 32));
if ((cx & mwait_mask) != mwait_mask)
return false;
/* We need to emulate the MWAIT_LEAF and for that we need both
* ecx and edx. The hypercall provides only partial information.
*/
ax = CPUID_MWAIT_LEAF;
bx = 0;
cx = 0;
dx = 0;
native_cpuid(&ax, &bx, &cx, &dx);
/* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
* don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
*/
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP);
set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
if ((HYPERVISOR_platform_op(&op) == 0) &&
(buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) {
cpuid_leaf5_ecx_val = cx;
cpuid_leaf5_edx_val = dx;
}
return true;
#else
return false;
#endif
}
static bool __init xen_check_xsave(void)
{
unsigned int err, eax, edx;
/*
* Xen 4.0 and older accidentally leaked the host XSAVE flag into guest
* view, despite not being able to support guests using the
* functionality. Probe for the actual availability of XSAVE by seeing
* whether xgetbv executes successfully or raises #UD.
*/
asm volatile("1: .byte 0x0f,0x01,0xd0\n\t" /* xgetbv */
"xor %[err], %[err]\n"
"2:\n\t"
".pushsection .fixup,\"ax\"\n\t"
"3: movl $1,%[err]\n\t"
"jmp 2b\n\t"
".popsection\n\t"
_ASM_EXTABLE(1b, 3b)
: [err] "=r" (err), "=a" (eax), "=d" (edx)
: "c" (0));
return err == 0;
}
static void __init xen_init_capabilities(void)
{
setup_clear_cpu_cap(X86_BUG_SYSRET_SS_ATTRS);
setup_force_cpu_cap(X86_FEATURE_XENPV);
setup_clear_cpu_cap(X86_FEATURE_DCA);
setup_clear_cpu_cap(X86_FEATURE_APERFMPERF);
setup_clear_cpu_cap(X86_FEATURE_MTRR);
setup_clear_cpu_cap(X86_FEATURE_ACC);
setup_clear_cpu_cap(X86_FEATURE_X2APIC);
if (!xen_initial_domain())
setup_clear_cpu_cap(X86_FEATURE_ACPI);
if (xen_check_mwait())
setup_force_cpu_cap(X86_FEATURE_MWAIT);
else
setup_clear_cpu_cap(X86_FEATURE_MWAIT);
if (xen_check_xsave()) {
setup_force_cpu_cap(X86_FEATURE_XSAVE);
setup_force_cpu_cap(X86_FEATURE_OSXSAVE);
} else {
setup_clear_cpu_cap(X86_FEATURE_XSAVE);
setup_clear_cpu_cap(X86_FEATURE_OSXSAVE);
}
}
static void xen_set_debugreg(int reg, unsigned long val)
{
HYPERVISOR_set_debugreg(reg, val);
}
static unsigned long xen_get_debugreg(int reg)
{
return HYPERVISOR_get_debugreg(reg);
}
static void xen_end_context_switch(struct task_struct *next)
{
xen_mc_flush();
paravirt_end_context_switch(next);
}
static unsigned long xen_store_tr(void)
{
return 0;
}
/*
* Set the page permissions for a particular virtual address. If the
* address is a vmalloc mapping (or other non-linear mapping), then
* find the linear mapping of the page and also set its protections to
* match.
*/
static void set_aliased_prot(void *v, pgprot_t prot)
{
int level;
pte_t *ptep;
pte_t pte;
unsigned long pfn;
struct page *page;
unsigned char dummy;
ptep = lookup_address((unsigned long)v, &level);
BUG_ON(ptep == NULL);
pfn = pte_pfn(*ptep);
page = pfn_to_page(pfn);
pte = pfn_pte(pfn, prot);
/*
* Careful: update_va_mapping() will fail if the virtual address
* we're poking isn't populated in the page tables. We don't
* need to worry about the direct map (that's always in the page
* tables), but we need to be careful about vmap space. In
* particular, the top level page table can lazily propagate
* entries between processes, so if we've switched mms since we
* vmapped the target in the first place, we might not have the
* top-level page table entry populated.
*
* We disable preemption because we want the same mm active when
* we probe the target and when we issue the hypercall. We'll
* have the same nominal mm, but if we're a kernel thread, lazy
* mm dropping could change our pgd.
*
* Out of an abundance of caution, this uses __get_user() to fault
* in the target address just in case there's some obscure case
* in which the target address isn't readable.
*/
preempt_disable();
probe_kernel_read(&dummy, v, 1);
if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
BUG();
if (!PageHighMem(page)) {
void *av = __va(PFN_PHYS(pfn));
if (av != v)
if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
BUG();
} else
kmap_flush_unused();
preempt_enable();
}
static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
int i;
/*
* We need to mark the all aliases of the LDT pages RO. We
* don't need to call vm_flush_aliases(), though, since that's
* only responsible for flushing aliases out the TLBs, not the
* page tables, and Xen will flush the TLB for us if needed.
*
* To avoid confusing future readers: none of this is necessary
* to load the LDT. The hypervisor only checks this when the
* LDT is faulted in due to subsequent descriptor access.
*/
for (i = 0; i < entries; i += entries_per_page)
set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
}
static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
{
const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
int i;
for (i = 0; i < entries; i += entries_per_page)
set_aliased_prot(ldt + i, PAGE_KERNEL);
}
static void xen_set_ldt(const void *addr, unsigned entries)
{
struct mmuext_op *op;
struct multicall_space mcs = xen_mc_entry(sizeof(*op));
trace_xen_cpu_set_ldt(addr, entries);
op = mcs.args;
op->cmd = MMUEXT_SET_LDT;
op->arg1.linear_addr = (unsigned long)addr;
op->arg2.nr_ents = entries;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
static void xen_load_gdt(const struct desc_ptr *dtr)
{
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
unsigned long frames[pages];
int f;
/*
* A GDT can be up to 64k in size, which corresponds to 8192
* 8-byte entries, or 16 4k pages..
*/
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
int level;
pte_t *ptep;
unsigned long pfn, mfn;
void *virt;
/*
* The GDT is per-cpu and is in the percpu data area.
* That can be virtually mapped, so we need to do a
* page-walk to get the underlying MFN for the
* hypercall. The page can also be in the kernel's
* linear range, so we need to RO that mapping too.
*/
ptep = lookup_address(va, &level);
BUG_ON(ptep == NULL);
pfn = pte_pfn(*ptep);
mfn = pfn_to_mfn(pfn);
virt = __va(PFN_PHYS(pfn));
frames[f] = mfn;
make_lowmem_page_readonly((void *)va);
make_lowmem_page_readonly(virt);
}
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
BUG();
}
/*
* load_gdt for early boot, when the gdt is only mapped once
*/
static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
{
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
unsigned long frames[pages];
int f;
/*
* A GDT can be up to 64k in size, which corresponds to 8192
* 8-byte entries, or 16 4k pages..
*/
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
pte_t pte;
unsigned long pfn, mfn;
pfn = virt_to_pfn(va);
mfn = pfn_to_mfn(pfn);
pte = pfn_pte(pfn, PAGE_KERNEL_RO);
if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0))
BUG();
frames[f] = mfn;
}
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
BUG();
}
static inline bool desc_equal(const struct desc_struct *d1,
const struct desc_struct *d2)
{
return d1->a == d2->a && d1->b == d2->b;
}
static void load_TLS_descriptor(struct thread_struct *t,
unsigned int cpu, unsigned int i)
{
struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
struct desc_struct *gdt;
xmaddr_t maddr;
struct multicall_space mc;
if (desc_equal(shadow, &t->tls_array[i]))
return;
*shadow = t->tls_array[i];
gdt = get_cpu_gdt_rw(cpu);
maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
mc = __xen_mc_entry(0);
MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
}
static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
{
/*
* XXX sleazy hack: If we're being called in a lazy-cpu zone
* and lazy gs handling is enabled, it means we're in a
* context switch, and %gs has just been saved. This means we
* can zero it out to prevent faults on exit from the
* hypervisor if the next process has no %gs. Either way, it
* has been saved, and the new value will get loaded properly.
* This will go away as soon as Xen has been modified to not
* save/restore %gs for normal hypercalls.
*
* On x86_64, this hack is not used for %gs, because gs points
* to KERNEL_GS_BASE (and uses it for PDA references), so we
* must not zero %gs on x86_64
*
* For x86_64, we need to zero %fs, otherwise we may get an
* exception between the new %fs descriptor being loaded and
* %fs being effectively cleared at __switch_to().
*/
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
#ifdef CONFIG_X86_32
lazy_load_gs(0);
#else
loadsegment(fs, 0);
#endif
}
xen_mc_batch();
load_TLS_descriptor(t, cpu, 0);
load_TLS_descriptor(t, cpu, 1);
load_TLS_descriptor(t, cpu, 2);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
#ifdef CONFIG_X86_64
static void xen_load_gs_index(unsigned int idx)
{
if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
BUG();
}
#endif
static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
const void *ptr)
{
xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
u64 entry = *(u64 *)ptr;
trace_xen_cpu_write_ldt_entry(dt, entrynum, entry);
preempt_disable();
xen_mc_flush();
if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
BUG();
preempt_enable();
}
static int cvt_gate_to_trap(int vector, const gate_desc *val,
struct trap_info *info)
{
unsigned long addr;
if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
return 0;
info->vector = vector;
addr = gate_offset(*val);
#ifdef CONFIG_X86_64
/*
* Look for known traps using IST, and substitute them
* appropriately. The debugger ones are the only ones we care
* about. Xen will handle faults like double_fault,
* so we should never see them. Warn if
* there's an unexpected IST-using fault handler.
*/
if (addr == (unsigned long)debug)
addr = (unsigned long)xen_debug;
else if (addr == (unsigned long)int3)
addr = (unsigned long)xen_int3;
else if (addr == (unsigned long)stack_segment)
addr = (unsigned long)xen_stack_segment;
else if (addr == (unsigned long)double_fault) {
/* Don't need to handle these */
return 0;
#ifdef CONFIG_X86_MCE
} else if (addr == (unsigned long)machine_check) {
/*
* when xen hypervisor inject vMCE to guest,
* use native mce handler to handle it
*/
;
#endif
} else if (addr == (unsigned long)nmi)
/*
* Use the native version as well.
*/
;
else {
/* Some other trap using IST? */
if (WARN_ON(val->ist != 0))
return 0;
}
#endif /* CONFIG_X86_64 */
info->address = addr;
info->cs = gate_segment(*val);
info->flags = val->dpl;
/* interrupt gates clear IF */
if (val->type == GATE_INTERRUPT)
info->flags |= 1 << 2;
return 1;
}
/* Locations of each CPU's IDT */
static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
/* Set an IDT entry. If the entry is part of the current IDT, then
also update Xen. */
static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
{
unsigned long p = (unsigned long)&dt[entrynum];
unsigned long start, end;
trace_xen_cpu_write_idt_entry(dt, entrynum, g);
preempt_disable();
start = __this_cpu_read(idt_desc.address);
end = start + __this_cpu_read(idt_desc.size) + 1;
xen_mc_flush();
native_write_idt_entry(dt, entrynum, g);
if (p >= start && (p + 8) <= end) {
struct trap_info info[2];
info[1].address = 0;
if (cvt_gate_to_trap(entrynum, g, &info[0]))
if (HYPERVISOR_set_trap_table(info))
BUG();
}
preempt_enable();
}
static void xen_convert_trap_info(const struct desc_ptr *desc,
struct trap_info *traps)
{
unsigned in, out, count;
count = (desc->size+1) / sizeof(gate_desc);
BUG_ON(count > 256);
for (in = out = 0; in < count; in++) {
gate_desc *entry = (gate_desc *)(desc->address) + in;
if (cvt_gate_to_trap(in, entry, &traps[out]))
out++;
}
traps[out].address = 0;
}
void xen_copy_trap_info(struct trap_info *traps)
{
const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
xen_convert_trap_info(desc, traps);
}
/* Load a new IDT into Xen. In principle this can be per-CPU, so we
hold a spinlock to protect the static traps[] array (static because
it avoids allocation, and saves stack space). */
static void xen_load_idt(const struct desc_ptr *desc)
{
static DEFINE_SPINLOCK(lock);
static struct trap_info traps[257];
trace_xen_cpu_load_idt(desc);
spin_lock(&lock);
memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
xen_convert_trap_info(desc, traps);
xen_mc_flush();
if (HYPERVISOR_set_trap_table(traps))
BUG();
spin_unlock(&lock);
}
/* Write a GDT descriptor entry. Ignore LDT descriptors, since
they're handled differently. */
static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
const void *desc, int type)
{
trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
preempt_disable();
switch (type) {
case DESC_LDT:
case DESC_TSS:
/* ignore */
break;
default: {
xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
xen_mc_flush();
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
BUG();
}
}
preempt_enable();
}
/*
* Version of write_gdt_entry for use at early boot-time needed to
* update an entry as simply as possible.
*/
static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
const void *desc, int type)
{
trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
switch (type) {
case DESC_LDT:
case DESC_TSS:
/* ignore */
break;
default: {
xmaddr_t maddr = virt_to_machine(&dt[entry]);
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
dt[entry] = *(struct desc_struct *)desc;
}
}
}
static void xen_load_sp0(struct tss_struct *tss,
struct thread_struct *thread)
{
struct multicall_space mcs;
mcs = xen_mc_entry(0);
MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
xen_mc_issue(PARAVIRT_LAZY_CPU);
tss->x86_tss.sp0 = thread->sp0;
}
void xen_set_iopl_mask(unsigned mask)
{
struct physdev_set_iopl set_iopl;
/* Force the change at ring 0. */
set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
}
static void xen_io_delay(void)
{
}
static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
static unsigned long xen_read_cr0(void)
{
unsigned long cr0 = this_cpu_read(xen_cr0_value);
if (unlikely(cr0 == 0)) {
cr0 = native_read_cr0();
this_cpu_write(xen_cr0_value, cr0);
}
return cr0;
}
static void xen_write_cr0(unsigned long cr0)
{
struct multicall_space mcs;
this_cpu_write(xen_cr0_value, cr0);
/* Only pay attention to cr0.TS; everything else is
ignored. */
mcs = xen_mc_entry(0);
MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
static void xen_write_cr4(unsigned long cr4)
{
cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
native_write_cr4(cr4);
}
#ifdef CONFIG_X86_64
static inline unsigned long xen_read_cr8(void)
{
return 0;
}
static inline void xen_write_cr8(unsigned long val)
{
BUG_ON(val);
}
#endif
static u64 xen_read_msr_safe(unsigned int msr, int *err)
{
u64 val;
if (pmu_msr_read(msr, &val, err))
return val;
val = native_read_msr_safe(msr, err);
switch (msr) {
case MSR_IA32_APICBASE:
#ifdef CONFIG_X86_X2APIC
if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
#endif
val &= ~X2APIC_ENABLE;
break;
}
return val;
}
static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
{
int ret;
ret = 0;
switch (msr) {
#ifdef CONFIG_X86_64
unsigned which;
u64 base;
case MSR_FS_BASE: which = SEGBASE_FS; goto set;
case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
set:
base = ((u64)high << 32) | low;
if (HYPERVISOR_set_segment_base(which, base) != 0)
ret = -EIO;
break;
#endif
case MSR_STAR:
case MSR_CSTAR:
case MSR_LSTAR:
case MSR_SYSCALL_MASK:
case MSR_IA32_SYSENTER_CS:
case MSR_IA32_SYSENTER_ESP:
case MSR_IA32_SYSENTER_EIP:
/* Fast syscall setup is all done in hypercalls, so
these are all ignored. Stub them out here to stop
Xen console noise. */
break;
default:
if (!pmu_msr_write(msr, low, high, &ret))
ret = native_write_msr_safe(msr, low, high);
}
return ret;
}
static u64 xen_read_msr(unsigned int msr)
{
/*
* This will silently swallow a #GP from RDMSR. It may be worth
* changing that.
*/
int err;
return xen_read_msr_safe(msr, &err);
}
static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
{
/*
* This will silently swallow a #GP from WRMSR. It may be worth
* changing that.
*/
xen_write_msr_safe(msr, low, high);
}
void xen_setup_shared_info(void)
{
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
set_fixmap(FIX_PARAVIRT_BOOTMAP,
xen_start_info->shared_info);
HYPERVISOR_shared_info =
(struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
} else
HYPERVISOR_shared_info =
(struct shared_info *)__va(xen_start_info->shared_info);
#ifndef CONFIG_SMP
/* In UP this is as good a place as any to set up shared info */
xen_setup_vcpu_info_placement();
#endif
xen_setup_mfn_list_list();
}
/* This is called once we have the cpu_possible_mask */
void xen_setup_vcpu_info_placement(void)
{
int cpu;
for_each_possible_cpu(cpu) {
/* Set up direct vCPU id mapping for PV guests. */
per_cpu(xen_vcpu_id, cpu) = cpu;
xen_vcpu_setup(cpu);
}
/*
* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it.
*/
if (xen_have_vcpu_info_placement) {
pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct);
pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
}
}
static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
unsigned long addr, unsigned len)
{
char *start, *end, *reloc;
unsigned ret;
start = end = reloc = NULL;
#define SITE(op, x) \
case PARAVIRT_PATCH(op.x): \
if (xen_have_vcpu_info_placement) { \
start = (char *)xen_##x##_direct; \
end = xen_##x##_direct_end; \
reloc = xen_##x##_direct_reloc; \
} \
goto patch_site
switch (type) {
SITE(pv_irq_ops, irq_enable);
SITE(pv_irq_ops, irq_disable);
SITE(pv_irq_ops, save_fl);
SITE(pv_irq_ops, restore_fl);
#undef SITE
patch_site:
if (start == NULL || (end-start) > len)
goto default_patch;
ret = paravirt_patch_insns(insnbuf, len, start, end);
/* Note: because reloc is assigned from something that
appears to be an array, gcc assumes it's non-null,
but doesn't know its relationship with start and
end. */
if (reloc > start && reloc < end) {
int reloc_off = reloc - start;
long *relocp = (long *)(insnbuf + reloc_off);
long delta = start - (char *)addr;
*relocp += delta;
}
break;
default_patch:
default:
ret = paravirt_patch_default(type, clobbers, insnbuf,
addr, len);
break;
}
return ret;
}
static const struct pv_info xen_info __initconst = {
.shared_kernel_pmd = 0,
#ifdef CONFIG_X86_64
.extra_user_64bit_cs = FLAT_USER_CS64,
#endif
.name = "Xen",
};
static const struct pv_init_ops xen_init_ops __initconst = {
.patch = xen_patch,
};
static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.cpuid = xen_cpuid,
.set_debugreg = xen_set_debugreg,
.get_debugreg = xen_get_debugreg,
.read_cr0 = xen_read_cr0,
.write_cr0 = xen_write_cr0,
.read_cr4 = native_read_cr4,
.write_cr4 = xen_write_cr4,
#ifdef CONFIG_X86_64
.read_cr8 = xen_read_cr8,
.write_cr8 = xen_write_cr8,
#endif
.wbinvd = native_wbinvd,
.read_msr = xen_read_msr,
.write_msr = xen_write_msr,
.read_msr_safe = xen_read_msr_safe,
.write_msr_safe = xen_write_msr_safe,
.read_pmc = xen_read_pmc,
.iret = xen_iret,
#ifdef CONFIG_X86_64
.usergs_sysret64 = xen_sysret64,
#endif
.load_tr_desc = paravirt_nop,
.set_ldt = xen_set_ldt,
.load_gdt = xen_load_gdt,
.load_idt = xen_load_idt,
.load_tls = xen_load_tls,
#ifdef CONFIG_X86_64
.load_gs_index = xen_load_gs_index,
#endif
.alloc_ldt = xen_alloc_ldt,
.free_ldt = xen_free_ldt,
.store_idt = native_store_idt,
.store_tr = xen_store_tr,
.write_ldt_entry = xen_write_ldt_entry,
.write_gdt_entry = xen_write_gdt_entry,
.write_idt_entry = xen_write_idt_entry,
.load_sp0 = xen_load_sp0,
.set_iopl_mask = xen_set_iopl_mask,
.io_delay = xen_io_delay,
/* Xen takes care of %gs when switching to usermode for us */
.swapgs = paravirt_nop,
.start_context_switch = paravirt_start_context_switch,
.end_context_switch = xen_end_context_switch,
};
static void xen_restart(char *msg)
{
xen_reboot(SHUTDOWN_reboot);
}
static void xen_machine_halt(void)
{
xen_reboot(SHUTDOWN_poweroff);
}
static void xen_machine_power_off(void)
{
if (pm_power_off)
pm_power_off();
xen_reboot(SHUTDOWN_poweroff);
}
static void xen_crash_shutdown(struct pt_regs *regs)
{
xen_reboot(SHUTDOWN_crash);
}
static const struct machine_ops xen_machine_ops __initconst = {
.restart = xen_restart,
.halt = xen_machine_halt,
.power_off = xen_machine_power_off,
.shutdown = xen_machine_halt,
.crash_shutdown = xen_crash_shutdown,
.emergency_restart = xen_emergency_restart,
};
static unsigned char xen_get_nmi_reason(void)
{
unsigned char reason = 0;
/* Construct a value which looks like it came from port 0x61. */
if (test_bit(_XEN_NMIREASON_io_error,
&HYPERVISOR_shared_info->arch.nmi_reason))
reason |= NMI_REASON_IOCHK;
if (test_bit(_XEN_NMIREASON_pci_serr,
&HYPERVISOR_shared_info->arch.nmi_reason))
reason |= NMI_REASON_SERR;
return reason;
}
static void __init xen_boot_params_init_edd(void)
{
#if IS_ENABLED(CONFIG_EDD)
struct xen_platform_op op;
struct edd_info *edd_info;
u32 *mbr_signature;
unsigned nr;
int ret;
edd_info = boot_params.eddbuf;
mbr_signature = boot_params.edd_mbr_sig_buffer;
op.cmd = XENPF_firmware_info;
op.u.firmware_info.type = XEN_FW_DISK_INFO;
for (nr = 0; nr < EDDMAXNR; nr++) {
struct edd_info *info = edd_info + nr;
op.u.firmware_info.index = nr;
info->params.length = sizeof(info->params);
set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
&info->params);
ret = HYPERVISOR_platform_op(&op);
if (ret)
break;
#define C(x) info->x = op.u.firmware_info.u.disk_info.x
C(device);
C(version);
C(interface_support);
C(legacy_max_cylinder);
C(legacy_max_head);
C(legacy_sectors_per_track);
#undef C
}
boot_params.eddbuf_entries = nr;
op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
op.u.firmware_info.index = nr;
ret = HYPERVISOR_platform_op(&op);
if (ret)
break;
mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
}
boot_params.edd_mbr_sig_buf_entries = nr;
#endif
}
/*
* Set up the GDT and segment registers for -fstack-protector. Until
* we do this, we have to be careful not to call any stack-protected
* function, which is most of the kernel.
*/
static void xen_setup_gdt(int cpu)
{
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
pv_cpu_ops.load_gdt = xen_load_gdt_boot;
setup_stack_canary_segment(0);
switch_to_new_gdt(0);
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry;
pv_cpu_ops.load_gdt = xen_load_gdt;
}
static void __init xen_dom0_set_legacy_features(void)
{
x86_platform.legacy.rtc = 1;
}
/* First C function to be called on Xen boot */
asmlinkage __visible void __init xen_start_kernel(void)
{
struct physdev_set_iopl set_iopl;
unsigned long initrd_start = 0;
int rc;
if (!xen_start_info)
return;
xen_domain_type = XEN_PV_DOMAIN;
xen_setup_features();
xen_setup_machphys_mapping();
/* Install Xen paravirt ops */
pv_info = xen_info;
pv_init_ops = xen_init_ops;
pv_cpu_ops = xen_cpu_ops;
x86_platform.get_nmi_reason = xen_get_nmi_reason;
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.oem.arch_setup = xen_arch_setup;
x86_init.oem.banner = xen_banner;
xen_init_time_ops();
/*
* Set up some pagetable state before starting to set any ptes.
*/
xen_init_mmu_ops();
/* Prevent unwanted bits from being set in PTEs. */
__supported_pte_mask &= ~_PAGE_GLOBAL;
/*
* Prevent page tables from being allocated in highmem, even
* if CONFIG_HIGHPTE is enabled.
*/
__userpte_alloc_gfp &= ~__GFP_HIGHMEM;
/* Work out if we support NX */
x86_configure_nx();
/* Get mfn list */
xen_build_dynamic_phys_to_machine();
/*
* Set up kernel GDT and segment registers, mainly so that
* -fstack-protector code can be executed.
*/
xen_setup_gdt(0);
xen_init_irq_ops();
xen_init_capabilities();
#ifdef CONFIG_X86_LOCAL_APIC
/*
* set up the basic apic ops.
*/
xen_init_apic();
#endif
if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
}
machine_ops = xen_machine_ops;
/*
* The only reliable way to retain the initial address of the
* percpu gdt_page is to remember it here, so we can go and
* mark it RW later, when the initial percpu area is freed.
*/
xen_initial_gdt = &per_cpu(gdt_page, 0);
xen_smp_init();
#ifdef CONFIG_ACPI_NUMA
/*
* The pages we from Xen are not related to machine pages, so
* any NUMA information the kernel tries to get from ACPI will
* be meaningless. Prevent it from trying.
*/
acpi_numa = -1;
#endif
/* Don't do the full vcpu_info placement stuff until we have a
possible map and a non-dummy shared_info. */
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
local_irq_disable();
early_boot_irqs_disabled = true;
xen_raw_console_write("mapping kernel into physical memory\n");
xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base,
xen_start_info->nr_pages);
xen_reserve_special_pages();
/* keep using Xen gdt for now; no urgent need to change it */
#ifdef CONFIG_X86_32
pv_info.kernel_rpl = 1;
if (xen_feature(XENFEAT_supervisor_mode_kernel))
pv_info.kernel_rpl = 0;
#else
pv_info.kernel_rpl = 0;
#endif
/* set the limit of our address space */
xen_reserve_top();
/*
* We used to do this in xen_arch_setup, but that is too late
* on AMD were early_cpu_init (run before ->arch_setup()) calls
* early_amd_init which pokes 0xcf8 port.
*/
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
#ifdef CONFIG_X86_32
/* set up basic CPUID stuff */
cpu_detect(&new_cpu_data);
set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
new_cpu_data.x86_capability[CPUID_1_EDX] = cpuid_edx(1);
#endif
if (xen_start_info->mod_start) {
if (xen_start_info->flags & SIF_MOD_START_PFN)
initrd_start = PFN_PHYS(xen_start_info->mod_start);
else
initrd_start = __pa(xen_start_info->mod_start);
}
/* Poke various useful things into boot_params */
boot_params.hdr.type_of_loader = (9 << 4) | 0;
boot_params.hdr.ramdisk_image = initrd_start;
boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
if (!xen_initial_domain()) {
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
if (pci_xen)
x86_init.pci.arch_init = pci_xen_init;
} else {
const struct dom0_vga_console_info *info =
(void *)((char *)xen_start_info +
xen_start_info->console.dom0.info_off);
struct xen_platform_op op = {
.cmd = XENPF_firmware_info,
.interface_version = XENPF_INTERFACE_VERSION,
.u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS,
};
x86_platform.set_legacy_features =
xen_dom0_set_legacy_features;
xen_init_vga(info, xen_start_info->console.dom0.info_size);
xen_start_info->console.domU.mfn = 0;
xen_start_info->console.domU.evtchn = 0;
if (HYPERVISOR_platform_op(&op) == 0)
boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags;
/* Make sure ACS will be enabled */
pci_request_acs();
xen_acpi_sleep_register();
/* Avoid searching for BIOS MP tables */
x86_init.mpparse.find_smp_config = x86_init_noop;
x86_init.mpparse.get_smp_config = x86_init_uint_noop;
xen_boot_params_init_edd();
}
#ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */
pci_probe &= ~PCI_PROBE_BIOS;
#endif
xen_raw_console_write("about to get started...\n");
/* Let's presume PV guests always boot on vCPU with id 0. */
per_cpu(xen_vcpu_id, 0) = 0;
xen_setup_runstate_info(0);
xen_efi_init();
/* Start the world */
#ifdef CONFIG_X86_32
i386_start_kernel();
#else
cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
x86_64_start_reservations((char *)__pa_symbol(&boot_params));
#endif
}
static int xen_cpu_up_prepare_pv(unsigned int cpu)
{
int rc;
xen_setup_timer(cpu);
rc = xen_smp_intr_init(cpu);
if (rc) {
WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
cpu, rc);
return rc;
}
rc = xen_smp_intr_init_pv(cpu);
if (rc) {
WARN(1, "xen_smp_intr_init_pv() for CPU %d failed: %d\n",
cpu, rc);
return rc;
}
return 0;
}
static int xen_cpu_dead_pv(unsigned int cpu)
{
xen_smp_intr_free(cpu);
xen_smp_intr_free_pv(cpu);
xen_teardown_timer(cpu);
return 0;
}
static uint32_t __init xen_platform_pv(void)
{
if (xen_pv_domain())
return xen_cpuid_base();
return 0;
}
const struct hypervisor_x86 x86_hyper_xen_pv = {
.name = "Xen PV",
.detect = xen_platform_pv,
.pin_vcpu = xen_pin_vcpu,
};
EXPORT_SYMBOL(x86_hyper_xen_pv);
arch/x86/xen/enlighten_pvh.c 0 → 100644
View file @ a9648072
#include <linux/acpi.h>
#include <xen/hvc-console.h>
#include <asm/io_apic.h>
#include <asm/hypervisor.h>
#include <asm/e820/api.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
#include <xen/interface/memory.h>
#include <xen/interface/hvm/start_info.h>
/*
* PVH variables.
*
* xen_pvh and pvh_bootparams need to live in data segment since they
* are used after startup_{32|64}, which clear .bss, are invoked.
*/
bool xen_pvh __attribute__((section(".data"))) = 0;
struct boot_params pvh_bootparams __attribute__((section(".data")));
struct hvm_start_info pvh_start_info;
unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
static void xen_pvh_arch_setup(void)
{
/* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
if (nr_ioapics == 0)
acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
}
static void __init init_pvh_bootparams(void)
{
struct xen_memory_map memmap;
int rc;
memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_table);
set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_table);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc) {
xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
BUG();
}
pvh_bootparams.e820_entries = memmap.nr_entries;
if (pvh_bootparams.e820_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) {
pvh_bootparams.e820_table[pvh_bootparams.e820_entries].addr =
ISA_START_ADDRESS;
pvh_bootparams.e820_table[pvh_bootparams.e820_entries].size =
ISA_END_ADDRESS - ISA_START_ADDRESS;
pvh_bootparams.e820_table[pvh_bootparams.e820_entries].type =
E820_TYPE_RESERVED;
pvh_bootparams.e820_entries++;
} else
xen_raw_printk("Warning: Can fit ISA range into e820\n");
pvh_bootparams.hdr.cmd_line_ptr =
pvh_start_info.cmdline_paddr;
/* The first module is always ramdisk. */
if (pvh_start_info.nr_modules) {
struct hvm_modlist_entry *modaddr =
__va(pvh_start_info.modlist_paddr);
pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
pvh_bootparams.hdr.ramdisk_size = modaddr->size;
}
/*
* See Documentation/x86/boot.txt.
*
* Version 2.12 supports Xen entry point but we will use default x86/PC
* environment (i.e. hardware_subarch 0).
*/
pvh_bootparams.hdr.version = 0x212;
pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
}
/*
* This routine (and those that it might call) should not use
* anything that lives in .bss since that segment will be cleared later.
*/
void __init xen_prepare_pvh(void)
{
u32 msr;
u64 pfn;
if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
pvh_start_info.magic);
BUG();
}
xen_pvh = 1;
msr = cpuid_ebx(xen_cpuid_base() + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
init_pvh_bootparams();
x86_init.oem.arch_setup = xen_pvh_arch_setup;
}
arch/x86/xen/mmu.c
View file @ a9648072
/*
* Xen mmu operations
*
* This file contains the various mmu fetch and update operations.
* The most important job they must perform is the mapping between the
* domain's pfn and the overall machine mfns.
*
* Xen allows guests to directly update the pagetable, in a controlled
* fashion. In other words, the guest modifies the same pagetable
* that the CPU actually uses, which eliminates the overhead of having
* a separate shadow pagetable.
*
* In order to allow this, it falls on the guest domain to map its
* notion of a "physical" pfn - which is just a domain-local linear
* address - into a real "machine address" which the CPU's MMU can
* use.
*
* A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
* inserted directly into the pagetable. When creating a new
* pte/pmd/pgd, it converts the passed pfn into an mfn. Conversely,
* when reading the content back with __(pgd|pmd|pte)_val, it converts
* the mfn back into a pfn.
*
* The other constraint is that all pages which make up a pagetable
* must be mapped read-only in the guest. This prevents uncontrolled
* guest updates to the pagetable. Xen strictly enforces this, and
* will disallow any pagetable update which will end up mapping a
* pagetable page RW, and will disallow using any writable page as a
* pagetable.
*
* Naively, when loading %cr3 with the base of a new pagetable, Xen
* would need to validate the whole pagetable before going on.
* Naturally, this is quite slow. The solution is to "pin" a
* pagetable, which enforces all the constraints on the pagetable even
* when it is not actively in use. This menas that Xen can be assured
* that it is still valid when you do load it into %cr3, and doesn't
* need to revalidate it.
*
* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
*/
#include <linux/sched/mm.h>
#include <linux/highmem.h>
#include <linux/debugfs.h>
#include <linux/bug.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/seq_file.h>
#include <linux/crash_dump.h>
#include <trace/events/xen.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/fixmap.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/paravirt.h>
#include <asm/e820/api.h>
#include <asm/linkage.h>
#include <asm/page.h>
#include <asm/init.h>
#include <asm/pat.h>
#include <asm/smp.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/interface/xen.h>
#include <xen/interface/hvm/hvm_op.h>
#include <xen/interface/version.h>
#include <xen/interface/memory.h>
#include <xen/hvc-console.h>
#include "multicalls.h"
#include "mmu.h"
#include "debugfs.h"
/*
* Protects atomic reservation decrease/increase against concurrent increases.
* Also protects non-atomic updates of current_pages and balloon lists.
*/
DEFINE_SPINLOCK(xen_reservation_lock);
#ifdef CONFIG_X86_32
/*
* Identity map, in addition to plain kernel map. This needs to be
* large enough to allocate page table pages to allocate the rest.
* Each page can map 2MB.
*/
#define LEVEL1_IDENT_ENTRIES (PTRS_PER_PTE * 4)
static RESERVE_BRK_ARRAY(pte_t, level1_ident_pgt, LEVEL1_IDENT_ENTRIES);
#endif
#ifdef CONFIG_X86_64
/* l3 pud for userspace vsyscall mapping */
static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
#endif /* CONFIG_X86_64 */
/*
* Note about cr3 (pagetable base) values:
*
* xen_cr3 contains the current logical cr3 value; it contains the
* last set cr3. This may not be the current effective cr3, because
* its update may be being lazily deferred. However, a vcpu looking
* at its own cr3 can use this value knowing that it everything will
* be self-consistent.
*
* xen_current_cr3 contains the actual vcpu cr3; it is set once the
* hypercall to set the vcpu cr3 is complete (so it may be a little
* out of date, but it will never be set early). If one vcpu is
* looking at another vcpu's cr3 value, it should use this variable.
*/
DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
static phys_addr_t xen_pt_base, xen_pt_size __initdata;
/*
* Just beyond the highest usermode address. STACK_TOP_MAX has a
* redzone above it, so round it up to a PGD boundary.
*/
#define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
unsigned long arbitrary_virt_to_mfn(void *vaddr)
{
xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
return PFN_DOWN(maddr.maddr);
}
xmaddr_t arbitrary_virt_to_machine(void *vaddr)
{
unsigned long address = (unsigned long)vaddr;
unsigned int level;
pte_t *pte;
unsigned offset;
/*
* if the PFN is in the linear mapped vaddr range, we can just use
* the (quick) virt_to_machine() p2m lookup
*/
if (virt_addr_valid(vaddr))
return virt_to_machine(vaddr);
/* otherwise we have to do a (slower) full page-table walk */
pte = lookup_address(address, &level);
BUG_ON(pte == NULL);
offset = address & ~PAGE_MASK;
return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
}
EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
void make_lowmem_page_readonly(void *vaddr)
{
pte_t *pte, ptev;
unsigned long address = (unsigned long)vaddr;
unsigned int level;
pte = lookup_address(address, &level);
if (pte == NULL)
return; /* vaddr missing */
ptev = pte_wrprotect(*pte);
if (HYPERVISOR_update_va_mapping(address, ptev, 0))
BUG();
}
void make_lowmem_page_readwrite(void *vaddr)
{
pte_t *pte, ptev;
unsigned long address = (unsigned long)vaddr;
unsigned int level;
pte = lookup_address(address, &level);
if (pte == NULL)
return; /* vaddr missing */
ptev = pte_mkwrite(*pte);
if (HYPERVISOR_update_va_mapping(address, ptev, 0))
BUG();
}
static bool xen_page_pinned(void *ptr)
{
struct page *page = virt_to_page(ptr);
return PagePinned(page);
}
void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
{
struct multicall_space mcs;
struct mmu_update *u;
trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
mcs = xen_mc_entry(sizeof(*u));
u = mcs.args;
/* ptep might be kmapped when using 32-bit HIGHPTE */
u->ptr = virt_to_machine(ptep).maddr;
u->val = pte_val_ma(pteval);
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
EXPORT_SYMBOL_GPL(xen_set_domain_pte);
static void xen_extend_mmu_update(const struct mmu_update *update)
{
struct multicall_space mcs;
struct mmu_update *u;
mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
if (mcs.mc != NULL) {
mcs.mc->args[1]++;
} else {
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
u = mcs.args;
*u = *update;
}
static void xen_extend_mmuext_op(const struct mmuext_op *op)
{
struct multicall_space mcs;
struct mmuext_op *u;
mcs = xen_mc_extend_args(__HYPERVISOR_mmuext_op, sizeof(*u));
if (mcs.mc != NULL) {
mcs.mc->args[1]++;
} else {
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
u = mcs.args;
*u = *op;
}
static void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
{
struct mmu_update u;
preempt_disable();
xen_mc_batch();
/* ptr may be ioremapped for 64-bit pagetable setup */
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
u.val = pmd_val_ma(val);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_pmd(pmd_t *ptr, pmd_t val)
{
trace_xen_mmu_set_pmd(ptr, val);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
*ptr = val;
return;
}
xen_set_pmd_hyper(ptr, val);
}
/*
* Associate a virtual page frame with a given physical page frame
* and protection flags for that frame.
*/
void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
{
set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
}
static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)
{
struct mmu_update u;
if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU)
return false;
xen_mc_batch();
u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
u.val = pte_val_ma(pteval);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
return true;
}
static inline void __xen_set_pte(pte_t *ptep, pte_t pteval)
{
if (!xen_batched_set_pte(ptep, pteval)) {
/*
* Could call native_set_pte() here and trap and
* emulate the PTE write but with 32-bit guests this
* needs two traps (one for each of the two 32-bit
* words in the PTE) so do one hypercall directly
* instead.
*/
struct mmu_update u;
u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
u.val = pte_val_ma(pteval);
HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF);
}
}
static void xen_set_pte(pte_t *ptep, pte_t pteval)
{
trace_xen_mmu_set_pte(ptep, pteval);
__xen_set_pte(ptep, pteval);
}
static void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
trace_xen_mmu_set_pte_at(mm, addr, ptep, pteval);
__xen_set_pte(ptep, pteval);
}
pte_t xen_ptep_modify_prot_start(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
/* Just return the pte as-is. We preserve the bits on commit */
trace_xen_mmu_ptep_modify_prot_start(mm, addr, ptep, *ptep);
return *ptep;
}
void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
struct mmu_update u;
trace_xen_mmu_ptep_modify_prot_commit(mm, addr, ptep, pte);
xen_mc_batch();
u.ptr = virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
u.val = pte_val_ma(pte);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
/* Assume pteval_t is equivalent to all the other *val_t types. */
static pteval_t pte_mfn_to_pfn(pteval_t val)
{
if (val & _PAGE_PRESENT) {
unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
unsigned long pfn = mfn_to_pfn(mfn);
pteval_t flags = val & PTE_FLAGS_MASK;
if (unlikely(pfn == ~0))
val = flags & ~_PAGE_PRESENT;
else
val = ((pteval_t)pfn << PAGE_SHIFT) | flags;
}
return val;
}
static pteval_t pte_pfn_to_mfn(pteval_t val)
{
if (val & _PAGE_PRESENT) {
unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
pteval_t flags = val & PTE_FLAGS_MASK;
unsigned long mfn;
if (!xen_feature(XENFEAT_auto_translated_physmap))
mfn = __pfn_to_mfn(pfn);
else
mfn = pfn;
/*
* If there's no mfn for the pfn, then just create an
* empty non-present pte. Unfortunately this loses
* information about the original pfn, so
* pte_mfn_to_pfn is asymmetric.
*/
if (unlikely(mfn == INVALID_P2M_ENTRY)) {
mfn = 0;
flags = 0;
} else
mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
}
return val;
}
__visible pteval_t xen_pte_val(pte_t pte)
{
pteval_t pteval = pte.pte;
return pte_mfn_to_pfn(pteval);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
__visible pgdval_t xen_pgd_val(pgd_t pgd)
{
return pte_mfn_to_pfn(pgd.pgd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
__visible pte_t xen_make_pte(pteval_t pte)
{
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
__visible pgd_t xen_make_pgd(pgdval_t pgd)
{
pgd = pte_pfn_to_mfn(pgd);
return native_make_pgd(pgd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pgd);
__visible pmdval_t xen_pmd_val(pmd_t pmd)
{
return pte_mfn_to_pfn(pmd.pmd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pmd_val);
static void xen_set_pud_hyper(pud_t *ptr, pud_t val)
{
struct mmu_update u;
preempt_disable();
xen_mc_batch();
/* ptr may be ioremapped for 64-bit pagetable setup */
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
u.val = pud_val_ma(val);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_pud(pud_t *ptr, pud_t val)
{
trace_xen_mmu_set_pud(ptr, val);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
*ptr = val;
return;
}
xen_set_pud_hyper(ptr, val);
}
#ifdef CONFIG_X86_PAE
static void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
{
trace_xen_mmu_set_pte_atomic(ptep, pte);
set_64bit((u64 *)ptep, native_pte_val(pte));
}
static void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
trace_xen_mmu_pte_clear(mm, addr, ptep);
if (!xen_batched_set_pte(ptep, native_make_pte(0)))
native_pte_clear(mm, addr, ptep);
}
static void xen_pmd_clear(pmd_t *pmdp)
{
trace_xen_mmu_pmd_clear(pmdp);
set_pmd(pmdp, __pmd(0));
}
#endif /* CONFIG_X86_PAE */
__visible pmd_t xen_make_pmd(pmdval_t pmd)
{
pmd = pte_pfn_to_mfn(pmd);
return native_make_pmd(pmd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pmd);
#if CONFIG_PGTABLE_LEVELS == 4
__visible pudval_t xen_pud_val(pud_t pud)
{
return pte_mfn_to_pfn(pud.pud);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pud_val);
__visible pud_t xen_make_pud(pudval_t pud)
{
pud = pte_pfn_to_mfn(pud);
return native_make_pud(pud);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pud);
static pgd_t *xen_get_user_pgd(pgd_t *pgd)
{
pgd_t *pgd_page = (pgd_t *)(((unsigned long)pgd) & PAGE_MASK);
unsigned offset = pgd - pgd_page;
pgd_t *user_ptr = NULL;
if (offset < pgd_index(USER_LIMIT)) {
struct page *page = virt_to_page(pgd_page);
user_ptr = (pgd_t *)page->private;
if (user_ptr)
user_ptr += offset;
}
return user_ptr;
}
static void __xen_set_p4d_hyper(p4d_t *ptr, p4d_t val)
{
struct mmu_update u;
u.ptr = virt_to_machine(ptr).maddr;
u.val = p4d_val_ma(val);
xen_extend_mmu_update(&u);
}
/*
* Raw hypercall-based set_p4d, intended for in early boot before
* there's a page structure. This implies:
* 1. The only existing pagetable is the kernel's
* 2. It is always pinned
* 3. It has no user pagetable attached to it
*/
static void __init xen_set_p4d_hyper(p4d_t *ptr, p4d_t val)
{
preempt_disable();
xen_mc_batch();
__xen_set_p4d_hyper(ptr, val);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_p4d(p4d_t *ptr, p4d_t val)
{
pgd_t *user_ptr = xen_get_user_pgd((pgd_t *)ptr);
pgd_t pgd_val;
trace_xen_mmu_set_p4d(ptr, (p4d_t *)user_ptr, val);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
*ptr = val;
if (user_ptr) {
WARN_ON(xen_page_pinned(user_ptr));
pgd_val.pgd = p4d_val_ma(val);
*user_ptr = pgd_val;
}
return;
}
/* If it's pinned, then we can at least batch the kernel and
user updates together. */
xen_mc_batch();
__xen_set_p4d_hyper(ptr, val);
if (user_ptr)
__xen_set_p4d_hyper((p4d_t *)user_ptr, val);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
static int xen_pmd_walk(struct mm_struct *mm, pmd_t *pmd,
int (*func)(struct mm_struct *mm, struct page *, enum pt_level),
bool last, unsigned long limit)
{
int i, nr, flush = 0;
nr = last ? pmd_index(limit) + 1 : PTRS_PER_PMD;
for (i = 0; i < nr; i++) {
if (!pmd_none(pmd[i]))
flush |= (*func)(mm, pmd_page(pmd[i]), PT_PTE);
}
return flush;
}
static int xen_pud_walk(struct mm_struct *mm, pud_t *pud,
int (*func)(struct mm_struct *mm, struct page *, enum pt_level),
bool last, unsigned long limit)
{
int i, nr, flush = 0;
nr = last ? pud_index(limit) + 1 : PTRS_PER_PUD;
for (i = 0; i < nr; i++) {
pmd_t *pmd;
if (pud_none(pud[i]))
continue;
pmd = pmd_offset(&pud[i], 0);
if (PTRS_PER_PMD > 1)
flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
flush |= xen_pmd_walk(mm, pmd, func,
last && i == nr - 1, limit);
}
return flush;
}
static int xen_p4d_walk(struct mm_struct *mm, p4d_t *p4d,
int (*func)(struct mm_struct *mm, struct page *, enum pt_level),
bool last, unsigned long limit)
{
int i, nr, flush = 0;
nr = last ? p4d_index(limit) + 1 : PTRS_PER_P4D;
for (i = 0; i < nr; i++) {
pud_t *pud;
if (p4d_none(p4d[i]))
continue;
pud = pud_offset(&p4d[i], 0);
if (PTRS_PER_PUD > 1)
flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
flush |= xen_pud_walk(mm, pud, func,
last && i == nr - 1, limit);
}
return flush;
}
/*
* (Yet another) pagetable walker. This one is intended for pinning a
* pagetable. This means that it walks a pagetable and calls the
* callback function on each page it finds making up the page table,
* at every level. It walks the entire pagetable, but it only bothers
* pinning pte pages which are below limit. In the normal case this
* will be STACK_TOP_MAX, but at boot we need to pin up to
* FIXADDR_TOP.
*
* For 32-bit the important bit is that we don't pin beyond there,
* because then we start getting into Xen's ptes.
*
* For 64-bit, we must skip the Xen hole in the middle of the address
* space, just after the big x86-64 virtual hole.
*/
static int __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
int (*func)(struct mm_struct *mm, struct page *,
enum pt_level),
unsigned long limit)
{
int i, nr, flush = 0;
unsigned hole_low, hole_high;
/* The limit is the last byte to be touched */
limit--;
BUG_ON(limit >= FIXADDR_TOP);
if (xen_feature(XENFEAT_auto_translated_physmap))
return 0;
/*
* 64-bit has a great big hole in the middle of the address
* space, which contains the Xen mappings. On 32-bit these
* will end up making a zero-sized hole and so is a no-op.
*/
hole_low = pgd_index(USER_LIMIT);
hole_high = pgd_index(PAGE_OFFSET);
nr = pgd_index(limit) + 1;
for (i = 0; i < nr; i++) {
p4d_t *p4d;
if (i >= hole_low && i < hole_high)
continue;
if (pgd_none(pgd[i]))
continue;
p4d = p4d_offset(&pgd[i], 0);
if (PTRS_PER_P4D > 1)
flush |= (*func)(mm, virt_to_page(p4d), PT_P4D);
flush |= xen_p4d_walk(mm, p4d, func, i == nr - 1, limit);
}
/* Do the top level last, so that the callbacks can use it as
a cue to do final things like tlb flushes. */
flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
return flush;
}
static int xen_pgd_walk(struct mm_struct *mm,
int (*func)(struct mm_struct *mm, struct page *,
enum pt_level),
unsigned long limit)
{
return __xen_pgd_walk(mm, mm->pgd, func, limit);
}
/* If we're using split pte locks, then take the page's lock and
return a pointer to it. Otherwise return NULL. */
static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
{
spinlock_t *ptl = NULL;
#if USE_SPLIT_PTE_PTLOCKS
ptl = ptlock_ptr(page);
spin_lock_nest_lock(ptl, &mm->page_table_lock);
#endif
return ptl;
}
static void xen_pte_unlock(void *v)
{
spinlock_t *ptl = v;
spin_unlock(ptl);
}
static void xen_do_pin(unsigned level, unsigned long pfn)
{
struct mmuext_op op;
op.cmd = level;
op.arg1.mfn = pfn_to_mfn(pfn);
xen_extend_mmuext_op(&op);
}
static int xen_pin_page(struct mm_struct *mm, struct page *page,
enum pt_level level)
{
unsigned pgfl = TestSetPagePinned(page);
int flush;
if (pgfl)
flush = 0; /* already pinned */
else if (PageHighMem(page))
/* kmaps need flushing if we found an unpinned
highpage */
flush = 1;
else {
void *pt = lowmem_page_address(page);
unsigned long pfn = page_to_pfn(page);
struct multicall_space mcs = __xen_mc_entry(0);
spinlock_t *ptl;
flush = 0;
/*
* We need to hold the pagetable lock between the time
* we make the pagetable RO and when we actually pin
* it. If we don't, then other users may come in and
* attempt to update the pagetable by writing it,
* which will fail because the memory is RO but not
* pinned, so Xen won't do the trap'n'emulate.
*
* If we're using split pte locks, we can't hold the
* entire pagetable's worth of locks during the
* traverse, because we may wrap the preempt count (8
* bits). The solution is to mark RO and pin each PTE
* page while holding the lock. This means the number
* of locks we end up holding is never more than a
* batch size (~32 entries, at present).
*
* If we're not using split pte locks, we needn't pin
* the PTE pages independently, because we're
* protected by the overall pagetable lock.
*/
ptl = NULL;
if (level == PT_PTE)
ptl = xen_pte_lock(page, mm);
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
pfn_pte(pfn, PAGE_KERNEL_RO),
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
if (ptl) {
xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
/* Queue a deferred unlock for when this batch
is completed. */
xen_mc_callback(xen_pte_unlock, ptl);
}
}
return flush;
}
/* This is called just after a mm has been created, but it has not
been used yet. We need to make sure that its pagetable is all
read-only, and can be pinned. */
static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
{
trace_xen_mmu_pgd_pin(mm, pgd);
xen_mc_batch();
if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
/* re-enable interrupts for flushing */
xen_mc_issue(0);
kmap_flush_unused();
xen_mc_batch();
}
#ifdef CONFIG_X86_64
{
pgd_t *user_pgd = xen_get_user_pgd(pgd);
xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
if (user_pgd) {
xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
xen_do_pin(MMUEXT_PIN_L4_TABLE,
PFN_DOWN(__pa(user_pgd)));
}
}
#else /* CONFIG_X86_32 */
#ifdef CONFIG_X86_PAE
/* Need to make sure unshared kernel PMD is pinnable */
xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
PT_PMD);
#endif
xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
#endif /* CONFIG_X86_64 */
xen_mc_issue(0);
}
static void xen_pgd_pin(struct mm_struct *mm)
{
__xen_pgd_pin(mm, mm->pgd);
}
/*
* On save, we need to pin all pagetables to make sure they get their
* mfns turned into pfns. Search the list for any unpinned pgds and pin
* them (unpinned pgds are not currently in use, probably because the
* process is under construction or destruction).
*
* Expected to be called in stop_machine() ("equivalent to taking
* every spinlock in the system"), so the locking doesn't really
* matter all that much.
*/
void xen_mm_pin_all(void)
{
struct page *page;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
if (!PagePinned(page)) {
__xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
SetPageSavePinned(page);
}
}
spin_unlock(&pgd_lock);
}
/*
* The init_mm pagetable is really pinned as soon as its created, but
* that's before we have page structures to store the bits. So do all
* the book-keeping now.
*/
static int __init xen_mark_pinned(struct mm_struct *mm, struct page *page,
enum pt_level level)
{
SetPagePinned(page);
return 0;
}
static void __init xen_mark_init_mm_pinned(void)
{
xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
}
static int xen_unpin_page(struct mm_struct *mm, struct page *page,
enum pt_level level)
{
unsigned pgfl = TestClearPagePinned(page);
if (pgfl && !PageHighMem(page)) {
void *pt = lowmem_page_address(page);
unsigned long pfn = page_to_pfn(page);
spinlock_t *ptl = NULL;
struct multicall_space mcs;
/*
* Do the converse to pin_page. If we're using split
* pte locks, we must be holding the lock for while
* the pte page is unpinned but still RO to prevent
* concurrent updates from seeing it in this
* partially-pinned state.
*/
if (level == PT_PTE) {
ptl = xen_pte_lock(page, mm);
if (ptl)
xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
}
mcs = __xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
pfn_pte(pfn, PAGE_KERNEL),
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
if (ptl) {
/* unlock when batch completed */
xen_mc_callback(xen_pte_unlock, ptl);
}
}
return 0; /* never need to flush on unpin */
}
/* Release a pagetables pages back as normal RW */
static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
{
trace_xen_mmu_pgd_unpin(mm, pgd);
xen_mc_batch();
xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
#ifdef CONFIG_X86_64
{
pgd_t *user_pgd = xen_get_user_pgd(pgd);
if (user_pgd) {
xen_do_pin(MMUEXT_UNPIN_TABLE,
PFN_DOWN(__pa(user_pgd)));
xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
}
}
#endif
#ifdef CONFIG_X86_PAE
/* Need to make sure unshared kernel PMD is unpinned */
xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
PT_PMD);
#endif
__xen_pgd_walk(mm, pgd, xen_unpin_page, USER_LIMIT);
xen_mc_issue(0);
}
static void xen_pgd_unpin(struct mm_struct *mm)
{
__xen_pgd_unpin(mm, mm->pgd);
}
/*
* On resume, undo any pinning done at save, so that the rest of the
* kernel doesn't see any unexpected pinned pagetables.
*/
void xen_mm_unpin_all(void)
{
struct page *page;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
if (PageSavePinned(page)) {
BUG_ON(!PagePinned(page));
__xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
ClearPageSavePinned(page);
}
}
spin_unlock(&pgd_lock);
}
static void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
spin_lock(&next->page_table_lock);
xen_pgd_pin(next);
spin_unlock(&next->page_table_lock);
}
static void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{
spin_lock(&mm->page_table_lock);
xen_pgd_pin(mm);
spin_unlock(&mm->page_table_lock);
}
#ifdef CONFIG_SMP
/* Another cpu may still have their %cr3 pointing at the pagetable, so
we need to repoint it somewhere else before we can unpin it. */
static void drop_other_mm_ref(void *info)
{
struct mm_struct *mm = info;
struct mm_struct *active_mm;
active_mm = this_cpu_read(cpu_tlbstate.active_mm);
if (active_mm == mm && this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
leave_mm(smp_processor_id());
/* If this cpu still has a stale cr3 reference, then make sure
it has been flushed. */
if (this_cpu_read(xen_current_cr3) == __pa(mm->pgd))
load_cr3(swapper_pg_dir);
}
static void xen_drop_mm_ref(struct mm_struct *mm)
{
cpumask_var_t mask;
unsigned cpu;
if (current->active_mm == mm) {
if (current->mm == mm)
load_cr3(swapper_pg_dir);
else
leave_mm(smp_processor_id());
}
/* Get the "official" set of cpus referring to our pagetable. */
if (!alloc_cpumask_var(&mask, GFP_ATOMIC)) {
for_each_online_cpu(cpu) {
if (!cpumask_test_cpu(cpu, mm_cpumask(mm))
&& per_cpu(xen_current_cr3, cpu) != __pa(mm->pgd))
continue;
smp_call_function_single(cpu, drop_other_mm_ref, mm, 1);
}
return;
}
cpumask_copy(mask, mm_cpumask(mm));
/* It's possible that a vcpu may have a stale reference to our
cr3, because its in lazy mode, and it hasn't yet flushed
its set of pending hypercalls yet. In this case, we can
look at its actual current cr3 value, and force it to flush
if needed. */
for_each_online_cpu(cpu) {
if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd))
cpumask_set_cpu(cpu, mask);
}
if (!cpumask_empty(mask))
smp_call_function_many(mask, drop_other_mm_ref, mm, 1);
free_cpumask_var(mask);
}
#else
static void xen_drop_mm_ref(struct mm_struct *mm)
{
if (current->active_mm == mm)
load_cr3(swapper_pg_dir);
}
#endif
/*
* While a process runs, Xen pins its pagetables, which means that the
* hypervisor forces it to be read-only, and it controls all updates
* to it. This means that all pagetable updates have to go via the
* hypervisor, which is moderately expensive.
*
* Since we're pulling the pagetable down, we switch to use init_mm,
* unpin old process pagetable and mark it all read-write, which
* allows further operations on it to be simple memory accesses.
*
* The only subtle point is that another CPU may be still using the
* pagetable because of lazy tlb flushing. This means we need need to
* switch all CPUs off this pagetable before we can unpin it.
*/
static void xen_exit_mmap(struct mm_struct *mm)
{
get_cpu(); /* make sure we don't move around */
xen_drop_mm_ref(mm);
put_cpu();
spin_lock(&mm->page_table_lock);
/* pgd may not be pinned in the error exit path of execve */
if (xen_page_pinned(mm->pgd))
xen_pgd_unpin(mm);
spin_unlock(&mm->page_table_lock);
}
static void xen_post_allocator_init(void);
static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
{
struct mmuext_op op;
op.cmd = cmd;
op.arg1.mfn = pfn_to_mfn(pfn);
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
}
#ifdef CONFIG_X86_64
static void __init xen_cleanhighmap(unsigned long vaddr,
unsigned long vaddr_end)
{
unsigned long kernel_end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
pmd_t *pmd = level2_kernel_pgt + pmd_index(vaddr);
/* NOTE: The loop is more greedy than the cleanup_highmap variant.
* We include the PMD passed in on _both_ boundaries. */
for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));
pmd++, vaddr += PMD_SIZE) {
if (pmd_none(*pmd))
continue;
if (vaddr < (unsigned long) _text || vaddr > kernel_end)
set_pmd(pmd, __pmd(0));
}
/* In case we did something silly, we should crash in this function
* instead of somewhere later and be confusing. */
xen_mc_flush();
}
/*
* Make a page range writeable and free it.
*/
static void __init xen_free_ro_pages(unsigned long paddr, unsigned long size)
{
void *vaddr = __va(paddr);
void *vaddr_end = vaddr + size;
for (; vaddr < vaddr_end; vaddr += PAGE_SIZE)
make_lowmem_page_readwrite(vaddr);
memblock_free(paddr, size);
}
static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl, bool unpin)
{
unsigned long pa = __pa(pgtbl) & PHYSICAL_PAGE_MASK;
if (unpin)
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
ClearPagePinned(virt_to_page(__va(pa)));
xen_free_ro_pages(pa, PAGE_SIZE);
}
static void __init xen_cleanmfnmap_pmd(pmd_t *pmd, bool unpin)
{
unsigned long pa;
pte_t *pte_tbl;
int i;
if (pmd_large(*pmd)) {
pa = pmd_val(*pmd) & PHYSICAL_PAGE_MASK;
xen_free_ro_pages(pa, PMD_SIZE);
return;
}
pte_tbl = pte_offset_kernel(pmd, 0);
for (i = 0; i < PTRS_PER_PTE; i++) {
if (pte_none(pte_tbl[i]))
continue;
pa = pte_pfn(pte_tbl[i]) << PAGE_SHIFT;
xen_free_ro_pages(pa, PAGE_SIZE);
}
set_pmd(pmd, __pmd(0));
xen_cleanmfnmap_free_pgtbl(pte_tbl, unpin);
}
static void __init xen_cleanmfnmap_pud(pud_t *pud, bool unpin)
{
unsigned long pa;
pmd_t *pmd_tbl;
int i;
if (pud_large(*pud)) {
pa = pud_val(*pud) & PHYSICAL_PAGE_MASK;
xen_free_ro_pages(pa, PUD_SIZE);
return;
}
pmd_tbl = pmd_offset(pud, 0);
for (i = 0; i < PTRS_PER_PMD; i++) {
if (pmd_none(pmd_tbl[i]))
continue;
xen_cleanmfnmap_pmd(pmd_tbl + i, unpin);
}
set_pud(pud, __pud(0));
xen_cleanmfnmap_free_pgtbl(pmd_tbl, unpin);
}
static void __init xen_cleanmfnmap_p4d(p4d_t *p4d, bool unpin)
{
unsigned long pa;
pud_t *pud_tbl;
int i;
if (p4d_large(*p4d)) {
pa = p4d_val(*p4d) & PHYSICAL_PAGE_MASK;
xen_free_ro_pages(pa, P4D_SIZE);
return;
}
pud_tbl = pud_offset(p4d, 0);
for (i = 0; i < PTRS_PER_PUD; i++) {
if (pud_none(pud_tbl[i]))
continue;
xen_cleanmfnmap_pud(pud_tbl + i, unpin);
}
set_p4d(p4d, __p4d(0));
xen_cleanmfnmap_free_pgtbl(pud_tbl, unpin);
}
/*
* Since it is well isolated we can (and since it is perhaps large we should)
* also free the page tables mapping the initial P->M table.
*/
static void __init xen_cleanmfnmap(unsigned long vaddr)
{
pgd_t *pgd;
p4d_t *p4d;
unsigned int i;
bool unpin;
unpin = (vaddr == 2 * PGDIR_SIZE);
vaddr &= PMD_MASK;
pgd = pgd_offset_k(vaddr);
p4d = p4d_offset(pgd, 0);
for (i = 0; i < PTRS_PER_P4D; i++) {
if (p4d_none(p4d[i]))
continue;
xen_cleanmfnmap_p4d(p4d + i, unpin);
}
if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
set_pgd(pgd, __pgd(0));
xen_cleanmfnmap_free_pgtbl(p4d, unpin);
}
}
static void __init xen_pagetable_p2m_free(void)
{
unsigned long size;
unsigned long addr;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
/* No memory or already called. */
if ((unsigned long)xen_p2m_addr == xen_start_info->mfn_list)
return;
/* using __ka address and sticking INVALID_P2M_ENTRY! */
memset((void *)xen_start_info->mfn_list, 0xff, size);
addr = xen_start_info->mfn_list;
/*
* We could be in __ka space.
* We roundup to the PMD, which means that if anybody at this stage is
* using the __ka address of xen_start_info or
* xen_start_info->shared_info they are in going to crash. Fortunatly
* we have already revectored in xen_setup_kernel_pagetable and in
* xen_setup_shared_info.
*/
size = roundup(size, PMD_SIZE);
if (addr >= __START_KERNEL_map) {
xen_cleanhighmap(addr, addr + size);
size = PAGE_ALIGN(xen_start_info->nr_pages *
sizeof(unsigned long));
memblock_free(__pa(addr), size);
} else {
xen_cleanmfnmap(addr);
}
}
static void __init xen_pagetable_cleanhighmap(void)
{
unsigned long size;
unsigned long addr;
/* At this stage, cleanup_highmap has already cleaned __ka space
* from _brk_limit way up to the max_pfn_mapped (which is the end of
* the ramdisk). We continue on, erasing PMD entries that point to page
* tables - do note that they are accessible at this stage via __va.
* For good measure we also round up to the PMD - which means that if
* anybody is using __ka address to the initial boot-stack - and try
* to use it - they are going to crash. The xen_start_info has been
* taken care of already in xen_setup_kernel_pagetable. */
addr = xen_start_info->pt_base;
size = roundup(xen_start_info->nr_pt_frames * PAGE_SIZE, PMD_SIZE);
xen_cleanhighmap(addr, addr + size);
xen_start_info->pt_base = (unsigned long)__va(__pa(xen_start_info->pt_base));
#ifdef DEBUG
/* This is superfluous and is not necessary, but you know what
* lets do it. The MODULES_VADDR -> MODULES_END should be clear of
* anything at this stage. */
xen_cleanhighmap(MODULES_VADDR, roundup(MODULES_VADDR, PUD_SIZE) - 1);
#endif
}
#endif
static void __init xen_pagetable_p2m_setup(void)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
xen_vmalloc_p2m_tree();
#ifdef CONFIG_X86_64
xen_pagetable_p2m_free();
xen_pagetable_cleanhighmap();
#endif
/* And revector! Bye bye old array */
xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
}
static void __init xen_pagetable_init(void)
{
paging_init();
xen_post_allocator_init();
xen_pagetable_p2m_setup();
/* Allocate and initialize top and mid mfn levels for p2m structure */
xen_build_mfn_list_list();
/* Remap memory freed due to conflicts with E820 map */
if (!xen_feature(XENFEAT_auto_translated_physmap))
xen_remap_memory();
xen_setup_shared_info();
}
static void xen_write_cr2(unsigned long cr2)
{
this_cpu_read(xen_vcpu)->arch.cr2 = cr2;
}
static unsigned long xen_read_cr2(void)
{
return this_cpu_read(xen_vcpu)->arch.cr2;
}
unsigned long xen_read_cr2_direct(void)
{
return this_cpu_read(xen_vcpu_info.arch.cr2);
}
void xen_flush_tlb_all(void)
{
struct mmuext_op *op;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb_all(0);
preempt_disable();
mcs = xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_TLB_FLUSH_ALL;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_flush_tlb(void)
{
struct mmuext_op *op;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb(0);
preempt_disable();
mcs = xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_flush_tlb_single(unsigned long addr)
{
struct mmuext_op *op;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb_single(addr);
preempt_disable();
mcs = xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_INVLPG_LOCAL;
op->arg1.linear_addr = addr & PAGE_MASK;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_flush_tlb_others(const struct cpumask *cpus,
struct mm_struct *mm, unsigned long start,
unsigned long end)
{
struct {
struct mmuext_op op;
#ifdef CONFIG_SMP
DECLARE_BITMAP(mask, num_processors);
#else
DECLARE_BITMAP(mask, NR_CPUS);
#endif
} *args;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb_others(cpus, mm, start, end);
if (cpumask_empty(cpus))
return; /* nothing to do */
mcs = xen_mc_entry(sizeof(*args));
args = mcs.args;
args->op.arg2.vcpumask = to_cpumask(args->mask);
/* Remove us, and any offline CPUS. */
cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
if (end != TLB_FLUSH_ALL && (end - start) <= PAGE_SIZE) {
args->op.cmd = MMUEXT_INVLPG_MULTI;
args->op.arg1.linear_addr = start;
}
MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static unsigned long xen_read_cr3(void)
{
return this_cpu_read(xen_cr3);
}
static void set_current_cr3(void *v)
{
this_cpu_write(xen_current_cr3, (unsigned long)v);
}
static void __xen_write_cr3(bool kernel, unsigned long cr3)
{
struct mmuext_op op;
unsigned long mfn;
trace_xen_mmu_write_cr3(kernel, cr3);
if (cr3)
mfn = pfn_to_mfn(PFN_DOWN(cr3));
else
mfn = 0;
WARN_ON(mfn == 0 && kernel);
op.cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
op.arg1.mfn = mfn;
xen_extend_mmuext_op(&op);
if (kernel) {
this_cpu_write(xen_cr3, cr3);
/* Update xen_current_cr3 once the batch has actually
been submitted. */
xen_mc_callback(set_current_cr3, (void *)cr3);
}
}
static void xen_write_cr3(unsigned long cr3)
{
BUG_ON(preemptible());
xen_mc_batch(); /* disables interrupts */
/* Update while interrupts are disabled, so its atomic with
respect to ipis */
this_cpu_write(xen_cr3, cr3);
__xen_write_cr3(true, cr3);
#ifdef CONFIG_X86_64
{
pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
if (user_pgd)
__xen_write_cr3(false, __pa(user_pgd));
else
__xen_write_cr3(false, 0);
}
#endif
xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
}
#ifdef CONFIG_X86_64
/*
* At the start of the day - when Xen launches a guest, it has already
* built pagetables for the guest. We diligently look over them
* in xen_setup_kernel_pagetable and graft as appropriate them in the
* init_level4_pgt and its friends. Then when we are happy we load
* the new init_level4_pgt - and continue on.
*
* The generic code starts (start_kernel) and 'init_mem_mapping' sets
* up the rest of the pagetables. When it has completed it loads the cr3.
* N.B. that baremetal would start at 'start_kernel' (and the early
* #PF handler would create bootstrap pagetables) - so we are running
* with the same assumptions as what to do when write_cr3 is executed
* at this point.
*
* Since there are no user-page tables at all, we have two variants
* of xen_write_cr3 - the early bootup (this one), and the late one
* (xen_write_cr3). The reason we have to do that is that in 64-bit
* the Linux kernel and user-space are both in ring 3 while the
* hypervisor is in ring 0.
*/
static void __init xen_write_cr3_init(unsigned long cr3)
{
BUG_ON(preemptible());
xen_mc_batch(); /* disables interrupts */
/* Update while interrupts are disabled, so its atomic with
respect to ipis */
this_cpu_write(xen_cr3, cr3);
__xen_write_cr3(true, cr3);
xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
}
#endif
static int xen_pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd = mm->pgd;
int ret = 0;
BUG_ON(PagePinned(virt_to_page(pgd)));
#ifdef CONFIG_X86_64
{
struct page *page = virt_to_page(pgd);
pgd_t *user_pgd;
BUG_ON(page->private != 0);
ret = -ENOMEM;
user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
page->private = (unsigned long)user_pgd;
if (user_pgd != NULL) {
#ifdef CONFIG_X86_VSYSCALL_EMULATION
user_pgd[pgd_index(VSYSCALL_ADDR)] =
__pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
#endif
ret = 0;
}
BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
}
#endif
return ret;
}
static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
#ifdef CONFIG_X86_64
pgd_t *user_pgd = xen_get_user_pgd(pgd);
if (user_pgd)
free_page((unsigned long)user_pgd);
#endif
}
/*
* Init-time set_pte while constructing initial pagetables, which
* doesn't allow RO page table pages to be remapped RW.
*
* If there is no MFN for this PFN then this page is initially
* ballooned out so clear the PTE (as in decrease_reservation() in
* drivers/xen/balloon.c).
*
* Many of these PTE updates are done on unpinned and writable pages
* and doing a hypercall for these is unnecessary and expensive. At
* this point it is not possible to tell if a page is pinned or not,
* so always write the PTE directly and rely on Xen trapping and
* emulating any updates as necessary.
*/
__visible pte_t xen_make_pte_init(pteval_t pte)
{
#ifdef CONFIG_X86_64
unsigned long pfn;
/*
* Pages belonging to the initial p2m list mapped outside the default
* address range must be mapped read-only. This region contains the
* page tables for mapping the p2m list, too, and page tables MUST be
* mapped read-only.
*/
pfn = (pte & PTE_PFN_MASK) >> PAGE_SHIFT;
if (xen_start_info->mfn_list < __START_KERNEL_map &&
pfn >= xen_start_info->first_p2m_pfn &&
pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
pte &= ~_PAGE_RW;
#endif
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_init);
static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
{
#ifdef CONFIG_X86_32
/* If there's an existing pte, then don't allow _PAGE_RW to be set */
if (pte_mfn(pte) != INVALID_P2M_ENTRY
&& pte_val_ma(*ptep) & _PAGE_PRESENT)
pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
pte_val_ma(pte));
#endif
native_set_pte(ptep, pte);
}
/* Early in boot, while setting up the initial pagetable, assume
everything is pinned. */
static void __init xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
{
#ifdef CONFIG_FLATMEM
BUG_ON(mem_map); /* should only be used early */
#endif
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
}
/* Used for pmd and pud */
static void __init xen_alloc_pmd_init(struct mm_struct *mm, unsigned long pfn)
{
#ifdef CONFIG_FLATMEM
BUG_ON(mem_map); /* should only be used early */
#endif
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
}
/* Early release_pte assumes that all pts are pinned, since there's
only init_mm and anything attached to that is pinned. */
static void __init xen_release_pte_init(unsigned long pfn)
{
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
static void __init xen_release_pmd_init(unsigned long pfn)
{
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
static inline void __pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
{
struct multicall_space mcs;
struct mmuext_op *op;
mcs = __xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = cmd;
op->arg1.mfn = pfn_to_mfn(pfn);
MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
static inline void __set_pfn_prot(unsigned long pfn, pgprot_t prot)
{
struct multicall_space mcs;
unsigned long addr = (unsigned long)__va(pfn << PAGE_SHIFT);
mcs = __xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, (unsigned long)addr,
pfn_pte(pfn, prot), 0);
}
/* This needs to make sure the new pte page is pinned iff its being
attached to a pinned pagetable. */
static inline void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn,
unsigned level)
{
bool pinned = PagePinned(virt_to_page(mm->pgd));
trace_xen_mmu_alloc_ptpage(mm, pfn, level, pinned);
if (pinned) {
struct page *page = pfn_to_page(pfn);
SetPagePinned(page);
if (!PageHighMem(page)) {
xen_mc_batch();
__set_pfn_prot(pfn, PAGE_KERNEL_RO);
if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
__pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
xen_mc_issue(PARAVIRT_LAZY_MMU);
} else {
/* make sure there are no stray mappings of
this page */
kmap_flush_unused();
}
}
}
static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PTE);
}
static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PMD);
}
/* This should never happen until we're OK to use struct page */
static inline void xen_release_ptpage(unsigned long pfn, unsigned level)
{
struct page *page = pfn_to_page(pfn);
bool pinned = PagePinned(page);
trace_xen_mmu_release_ptpage(pfn, level, pinned);
if (pinned) {
if (!PageHighMem(page)) {
xen_mc_batch();
if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
__pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
__set_pfn_prot(pfn, PAGE_KERNEL);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
ClearPagePinned(page);
}
}
static void xen_release_pte(unsigned long pfn)
{
xen_release_ptpage(pfn, PT_PTE);
}
static void xen_release_pmd(unsigned long pfn)
{
xen_release_ptpage(pfn, PT_PMD);
}
#if CONFIG_PGTABLE_LEVELS >= 4
static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PUD);
}
static void xen_release_pud(unsigned long pfn)
{
xen_release_ptpage(pfn, PT_PUD);
}
#endif
void __init xen_reserve_top(void)
{
#ifdef CONFIG_X86_32
unsigned long top = HYPERVISOR_VIRT_START;
struct xen_platform_parameters pp;
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
top = pp.virt_start;
reserve_top_address(-top);
#endif /* CONFIG_X86_32 */
}
/*
* Like __va(), but returns address in the kernel mapping (which is
* all we have until the physical memory mapping has been set up.
*/
static void * __init __ka(phys_addr_t paddr)
{
#ifdef CONFIG_X86_64
return (void *)(paddr + __START_KERNEL_map);
#else
return __va(paddr);
#endif
}
/* Convert a machine address to physical address */
static unsigned long __init m2p(phys_addr_t maddr)
{
phys_addr_t paddr;
maddr &= PTE_PFN_MASK;
paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
return paddr;
}
/* Convert a machine address to kernel virtual */
static void * __init m2v(phys_addr_t maddr)
{
return __ka(m2p(maddr));
}
/* Set the page permissions on an identity-mapped pages */
static void __init set_page_prot_flags(void *addr, pgprot_t prot,
unsigned long flags)
{
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
pte_t pte = pfn_pte(pfn, prot);
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
BUG();
}
static void __init set_page_prot(void *addr, pgprot_t prot)
{
return set_page_prot_flags(addr, prot, UVMF_NONE);
}
#ifdef CONFIG_X86_32
static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
{
unsigned pmdidx, pteidx;
unsigned ident_pte;
unsigned long pfn;
level1_ident_pgt = extend_brk(sizeof(pte_t) * LEVEL1_IDENT_ENTRIES,
PAGE_SIZE);
ident_pte = 0;
pfn = 0;
for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
pte_t *pte_page;
/* Reuse or allocate a page of ptes */
if (pmd_present(pmd[pmdidx]))
pte_page = m2v(pmd[pmdidx].pmd);
else {
/* Check for free pte pages */
if (ident_pte == LEVEL1_IDENT_ENTRIES)
break;
pte_page = &level1_ident_pgt[ident_pte];
ident_pte += PTRS_PER_PTE;
pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
}
/* Install mappings */
for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
pte_t pte;
if (pfn > max_pfn_mapped)
max_pfn_mapped = pfn;
if (!pte_none(pte_page[pteidx]))
continue;
pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
pte_page[pteidx] = pte;
}
}
for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
set_page_prot(pmd, PAGE_KERNEL_RO);
}
#endif
void __init xen_setup_machphys_mapping(void)
{
struct xen_machphys_mapping mapping;
if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
machine_to_phys_mapping = (unsigned long *)mapping.v_start;
machine_to_phys_nr = mapping.max_mfn + 1;
} else {
machine_to_phys_nr = MACH2PHYS_NR_ENTRIES;
}
#ifdef CONFIG_X86_32
WARN_ON((machine_to_phys_mapping + (machine_to_phys_nr - 1))
< machine_to_phys_mapping);
#endif
}
#ifdef CONFIG_X86_64
static void __init convert_pfn_mfn(void *v)
{
pte_t *pte = v;
int i;
/* All levels are converted the same way, so just treat them
as ptes. */
for (i = 0; i < PTRS_PER_PTE; i++)
pte[i] = xen_make_pte(pte[i].pte);
}
static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
unsigned long addr)
{
if (*pt_base == PFN_DOWN(__pa(addr))) {
set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
clear_page((void *)addr);
(*pt_base)++;
}
if (*pt_end == PFN_DOWN(__pa(addr))) {
set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
clear_page((void *)addr);
(*pt_end)--;
}
}
/*
* Set up the initial kernel pagetable.
*
* We can construct this by grafting the Xen provided pagetable into
* head_64.S's preconstructed pagetables. We copy the Xen L2's into
* level2_ident_pgt, and level2_kernel_pgt. This means that only the
* kernel has a physical mapping to start with - but that's enough to
* get __va working. We need to fill in the rest of the physical
* mapping once some sort of allocator has been set up.
*/
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
pud_t *l3;
pmd_t *l2;
unsigned long addr[3];
unsigned long pt_base, pt_end;
unsigned i;
/* max_pfn_mapped is the last pfn mapped in the initial memory
* mappings. Considering that on Xen after the kernel mappings we
* have the mappings of some pages that don't exist in pfn space, we
* set max_pfn_mapped to the last real pfn mapped. */
if (xen_start_info->mfn_list < __START_KERNEL_map)
max_pfn_mapped = xen_start_info->first_p2m_pfn;
else
max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
pt_base = PFN_DOWN(__pa(xen_start_info->pt_base));
pt_end = pt_base + xen_start_info->nr_pt_frames;
/* Zap identity mapping */
init_level4_pgt[0] = __pgd(0);
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/* Pre-constructed entries are in pfn, so convert to mfn */
/* L4[272] -> level3_ident_pgt
* L4[511] -> level3_kernel_pgt */
convert_pfn_mfn(init_level4_pgt);
/* L3_i[0] -> level2_ident_pgt */
convert_pfn_mfn(level3_ident_pgt);
/* L3_k[510] -> level2_kernel_pgt
* L3_k[511] -> level2_fixmap_pgt */
convert_pfn_mfn(level3_kernel_pgt);
/* L3_k[511][506] -> level1_fixmap_pgt */
convert_pfn_mfn(level2_fixmap_pgt);
}
/* We get [511][511] and have Xen's version of level2_kernel_pgt */
l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
addr[0] = (unsigned long)pgd;
addr[1] = (unsigned long)l3;
addr[2] = (unsigned long)l2;
/* Graft it onto L4[272][0]. Note that we creating an aliasing problem:
* Both L4[272][0] and L4[511][510] have entries that point to the same
* L2 (PMD) tables. Meaning that if you modify it in __va space
* it will be also modified in the __ka space! (But if you just
* modify the PMD table to point to other PTE's or none, then you
* are OK - which is what cleanup_highmap does) */
copy_page(level2_ident_pgt, l2);
/* Graft it onto L4[511][510] */
copy_page(level2_kernel_pgt, l2);
/* Copy the initial P->M table mappings if necessary. */
i = pgd_index(xen_start_info->mfn_list);
if (i && i < pgd_index(__START_KERNEL_map))
init_level4_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/* Make pagetable pieces RO */
set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
set_page_prot(level2_ident_pgt, PAGE_KERNEL_RO);
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
set_page_prot(level1_fixmap_pgt, PAGE_KERNEL_RO);
/* Pin down new L4 */
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
PFN_DOWN(__pa_symbol(init_level4_pgt)));
/* Unpin Xen-provided one */
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
/*
* At this stage there can be no user pgd, and no page
* structure to attach it to, so make sure we just set kernel
* pgd.
*/
xen_mc_batch();
__xen_write_cr3(true, __pa(init_level4_pgt));
xen_mc_issue(PARAVIRT_LAZY_CPU);
} else
native_write_cr3(__pa(init_level4_pgt));
/* We can't that easily rip out L3 and L2, as the Xen pagetables are
* set out this way: [L4], [L1], [L2], [L3], [L1], [L1] ... for
* the initial domain. For guests using the toolstack, they are in:
* [L4], [L3], [L2], [L1], [L1], order .. So for dom0 we can only
* rip out the [L4] (pgd), but for guests we shave off three pages.
*/
for (i = 0; i < ARRAY_SIZE(addr); i++)
check_pt_base(&pt_base, &pt_end, addr[i]);
/* Our (by three pages) smaller Xen pagetable that we are using */
xen_pt_base = PFN_PHYS(pt_base);
xen_pt_size = (pt_end - pt_base) * PAGE_SIZE;
memblock_reserve(xen_pt_base, xen_pt_size);
/* Revector the xen_start_info */
xen_start_info = (struct start_info *)__va(__pa(xen_start_info));
}
/*
* Read a value from a physical address.
*/
static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
{
unsigned long *vaddr;
unsigned long val;
vaddr = early_memremap_ro(addr, sizeof(val));
val = *vaddr;
early_memunmap(vaddr, sizeof(val));
return val;
}
/*
* Translate a virtual address to a physical one without relying on mapped
* page tables.
*/
static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
{
phys_addr_t pa;
pgd_t pgd;
pud_t pud;
pmd_t pmd;
pte_t pte;
pa = read_cr3();
pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
sizeof(pgd)));
if (!pgd_present(pgd))
return 0;
pa = pgd_val(pgd) & PTE_PFN_MASK;
pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
sizeof(pud)));
if (!pud_present(pud))
return 0;
pa = pud_pfn(pud) << PAGE_SHIFT;
if (pud_large(pud))
return pa + (vaddr & ~PUD_MASK);
pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
sizeof(pmd)));
if (!pmd_present(pmd))
return 0;
pa = pmd_pfn(pmd) << PAGE_SHIFT;
if (pmd_large(pmd))
return pa + (vaddr & ~PMD_MASK);
pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
sizeof(pte)));
if (!pte_present(pte))
return 0;
pa = pte_pfn(pte) << PAGE_SHIFT;
return pa | (vaddr & ~PAGE_MASK);
}
/*
* Find a new area for the hypervisor supplied p2m list and relocate the p2m to
* this area.
*/
void __init xen_relocate_p2m(void)
{
phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys, p4d_phys;
unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
int n_pte, n_pt, n_pmd, n_pud, n_p4d, idx_pte, idx_pt, idx_pmd, idx_pud, idx_p4d;
pte_t *pt;
pmd_t *pmd;
pud_t *pud;
p4d_t *p4d = NULL;
pgd_t *pgd;
unsigned long *new_p2m;
int save_pud;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
n_pud = roundup(size, P4D_SIZE) >> P4D_SHIFT;
if (PTRS_PER_P4D > 1)
n_p4d = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
else
n_p4d = 0;
n_frames = n_pte + n_pt + n_pmd + n_pud + n_p4d;
new_area = xen_find_free_area(PFN_PHYS(n_frames));
if (!new_area) {
xen_raw_console_write("Can't find new memory area for p2m needed due to E820 map conflict\n");
BUG();
}
/*
* Setup the page tables for addressing the new p2m list.
* We have asked the hypervisor to map the p2m list at the user address
* PUD_SIZE. It may have done so, or it may have used a kernel space
* address depending on the Xen version.
* To avoid any possible virtual address collision, just use
* 2 * PUD_SIZE for the new area.
*/
p4d_phys = new_area;
pud_phys = p4d_phys + PFN_PHYS(n_p4d);
pmd_phys = pud_phys + PFN_PHYS(n_pud);
pt_phys = pmd_phys + PFN_PHYS(n_pmd);
p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
pgd = __va(read_cr3());
new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
idx_p4d = 0;
save_pud = n_pud;
do {
if (n_p4d > 0) {
p4d = early_memremap(p4d_phys, PAGE_SIZE);
clear_page(p4d);
n_pud = min(save_pud, PTRS_PER_P4D);
}
for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
pud = early_memremap(pud_phys, PAGE_SIZE);
clear_page(pud);
for (idx_pmd = 0; idx_pmd < min(n_pmd, PTRS_PER_PUD);
idx_pmd++) {
pmd = early_memremap(pmd_phys, PAGE_SIZE);
clear_page(pmd);
for (idx_pt = 0; idx_pt < min(n_pt, PTRS_PER_PMD);
idx_pt++) {
pt = early_memremap(pt_phys, PAGE_SIZE);
clear_page(pt);
for (idx_pte = 0;
idx_pte < min(n_pte, PTRS_PER_PTE);
idx_pte++) {
set_pte(pt + idx_pte,
pfn_pte(p2m_pfn, PAGE_KERNEL));
p2m_pfn++;
}
n_pte -= PTRS_PER_PTE;
early_memunmap(pt, PAGE_SIZE);
make_lowmem_page_readonly(__va(pt_phys));
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
PFN_DOWN(pt_phys));
set_pmd(pmd + idx_pt,
__pmd(_PAGE_TABLE | pt_phys));
pt_phys += PAGE_SIZE;
}
n_pt -= PTRS_PER_PMD;
early_memunmap(pmd, PAGE_SIZE);
make_lowmem_page_readonly(__va(pmd_phys));
pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
PFN_DOWN(pmd_phys));
set_pud(pud + idx_pmd, __pud(_PAGE_TABLE | pmd_phys));
pmd_phys += PAGE_SIZE;
}
n_pmd -= PTRS_PER_PUD;
early_memunmap(pud, PAGE_SIZE);
make_lowmem_page_readonly(__va(pud_phys));
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
if (n_p4d > 0)
set_p4d(p4d + idx_pud, __p4d(_PAGE_TABLE | pud_phys));
else
set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
pud_phys += PAGE_SIZE;
}
if (n_p4d > 0) {
save_pud -= PTRS_PER_P4D;
early_memunmap(p4d, PAGE_SIZE);
make_lowmem_page_readonly(__va(p4d_phys));
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE, PFN_DOWN(p4d_phys));
set_pgd(pgd + 2 + idx_p4d, __pgd(_PAGE_TABLE | p4d_phys));
p4d_phys += PAGE_SIZE;
}
} while (++idx_p4d < n_p4d);
/* Now copy the old p2m info to the new area. */
memcpy(new_p2m, xen_p2m_addr, size);
xen_p2m_addr = new_p2m;
/* Release the old p2m list and set new list info. */
p2m_pfn = PFN_DOWN(xen_early_virt_to_phys(xen_start_info->mfn_list));
BUG_ON(!p2m_pfn);
p2m_pfn_end = p2m_pfn + PFN_DOWN(size);
if (xen_start_info->mfn_list < __START_KERNEL_map) {
pfn = xen_start_info->first_p2m_pfn;
pfn_end = xen_start_info->first_p2m_pfn +
xen_start_info->nr_p2m_frames;
set_pgd(pgd + 1, __pgd(0));
} else {
pfn = p2m_pfn;
pfn_end = p2m_pfn_end;
}
memblock_free(PFN_PHYS(pfn), PAGE_SIZE * (pfn_end - pfn));
while (pfn < pfn_end) {
if (pfn == p2m_pfn) {
pfn = p2m_pfn_end;
continue;
}
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
pfn++;
}
xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
xen_start_info->first_p2m_pfn = PFN_DOWN(new_area);
xen_start_info->nr_p2m_frames = n_frames;
}
#else /* !CONFIG_X86_64 */
static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
static void __init xen_write_cr3_init(unsigned long cr3)
{
unsigned long pfn = PFN_DOWN(__pa(swapper_pg_dir));
BUG_ON(read_cr3() != __pa(initial_page_table));
BUG_ON(cr3 != __pa(swapper_pg_dir));
/*
* We are switching to swapper_pg_dir for the first time (from
* initial_page_table) and therefore need to mark that page
* read-only and then pin it.
*
* Xen disallows sharing of kernel PMDs for PAE
* guests. Therefore we must copy the kernel PMD from
* initial_page_table into a new kernel PMD to be used in
* swapper_pg_dir.
*/
swapper_kernel_pmd =
extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
copy_page(swapper_kernel_pmd, initial_kernel_pmd);
swapper_pg_dir[KERNEL_PGD_BOUNDARY] =
__pgd(__pa(swapper_kernel_pmd) | _PAGE_PRESENT);
set_page_prot(swapper_kernel_pmd, PAGE_KERNEL_RO);
set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
xen_write_cr3(cr3);
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, pfn);
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
PFN_DOWN(__pa(initial_page_table)));
set_page_prot(initial_page_table, PAGE_KERNEL);
set_page_prot(initial_kernel_pmd, PAGE_KERNEL);
#include <linux/pfn.h>
#include <asm/xen/page.h>
#include <asm/xen/hypercall.h>
#include <xen/interface/memory.h>
pv_mmu_ops.write_cr3 = &xen_write_cr3;
}
#include "multicalls.h"
#include "mmu.h"
/*
* For 32 bit domains xen_start_info->pt_base is the pgd address which might be
* not the first page table in the page table pool.
* Iterate through the initial page tables to find the real page table base.
* Protects atomic reservation decrease/increase against concurrent increases.
* Also protects non-atomic updates of current_pages and balloon lists.
*/
static phys_addr_t xen_find_pt_base(pmd_t *pmd)
{
phys_addr_t pt_base, paddr;
unsigned pmdidx;
pt_base = min(__pa(xen_start_info->pt_base), __pa(pmd));
for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++)
if (pmd_present(pmd[pmdidx]) && !pmd_large(pmd[pmdidx])) {
paddr = m2p(pmd[pmdidx].pmd);
pt_base = min(pt_base, paddr);
}
return pt_base;
}
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
pmd_t *kernel_pmd;
kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
xen_pt_base = xen_find_pt_base(kernel_pmd);
xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
initial_kernel_pmd =
extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
max_pfn_mapped = PFN_DOWN(xen_pt_base + xen_pt_size + 512 * 1024);
copy_page(initial_kernel_pmd, kernel_pmd);
xen_map_identity_early(initial_kernel_pmd, max_pfn);
copy_page(initial_page_table, pgd);
initial_page_table[KERNEL_PGD_BOUNDARY] =
__pgd(__pa(initial_kernel_pmd) | _PAGE_PRESENT);
set_page_prot(initial_kernel_pmd, PAGE_KERNEL_RO);
set_page_prot(initial_page_table, PAGE_KERNEL_RO);
set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
PFN_DOWN(__pa(initial_page_table)));
xen_write_cr3(__pa(initial_page_table));
memblock_reserve(xen_pt_base, xen_pt_size);
}
#endif /* CONFIG_X86_64 */
DEFINE_SPINLOCK(xen_reservation_lock);
void __init xen_reserve_special_pages(void)
unsigned long arbitrary_virt_to_mfn(void *vaddr)
{
phys_addr_t paddr;
memblock_reserve(__pa(xen_start_info), PAGE_SIZE);
if (xen_start_info->store_mfn) {
paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->store_mfn));
memblock_reserve(paddr, PAGE_SIZE);
}
if (!xen_initial_domain()) {
paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->console.domU.mfn));
memblock_reserve(paddr, PAGE_SIZE);
}
}
xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
void __init xen_pt_check_e820(void)
{
if (xen_is_e820_reserved(xen_pt_base, xen_pt_size)) {
xen_raw_console_write("Xen hypervisor allocated page table memory conflicts with E820 map\n");
BUG();
}
return PFN_DOWN(maddr.maddr);
}
static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
xmaddr_t arbitrary_virt_to_machine(void *vaddr)
{
pte_t pte;
phys >>= PAGE_SHIFT;
switch (idx) {
case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
case FIX_RO_IDT:
#ifdef CONFIG_X86_32
case FIX_WP_TEST:
# ifdef CONFIG_HIGHMEM
case FIX_KMAP_BEGIN ... FIX_KMAP_END:
# endif
#elif defined(CONFIG_X86_VSYSCALL_EMULATION)
case VSYSCALL_PAGE:
#endif
case FIX_TEXT_POKE0:
case FIX_TEXT_POKE1:
case FIX_GDT_REMAP_BEGIN ... FIX_GDT_REMAP_END:
/* All local page mappings */
pte = pfn_pte(phys, prot);
break;
#ifdef CONFIG_X86_LOCAL_APIC
case FIX_APIC_BASE: /* maps dummy local APIC */
pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
break;
#endif
unsigned long address = (unsigned long)vaddr;
unsigned int level;
pte_t *pte;
unsigned offset;
#ifdef CONFIG_X86_IO_APIC
case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END:
/*
* We just don't map the IO APIC - all access is via
* hypercalls. Keep the address in the pte for reference.
* if the PFN is in the linear mapped vaddr range, we can just use
* the (quick) virt_to_machine() p2m lookup
*/
pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
break;
#endif
case FIX_PARAVIRT_BOOTMAP:
/* This is an MFN, but it isn't an IO mapping from the
IO domain */
pte = mfn_pte(phys, prot);
break;
default:
/* By default, set_fixmap is used for hardware mappings */
pte = mfn_pte(phys, prot);
break;
}
__native_set_fixmap(idx, pte);
#ifdef CONFIG_X86_VSYSCALL_EMULATION
/* Replicate changes to map the vsyscall page into the user
pagetable vsyscall mapping. */
if (idx == VSYSCALL_PAGE) {
unsigned long vaddr = __fix_to_virt(idx);
set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
}
#endif
}
static void __init xen_post_allocator_init(void)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
pv_mmu_ops.set_pte = xen_set_pte;
pv_mmu_ops.set_pmd = xen_set_pmd;
pv_mmu_ops.set_pud = xen_set_pud;
#if CONFIG_PGTABLE_LEVELS >= 4
pv_mmu_ops.set_p4d = xen_set_p4d;
#endif
/* This will work as long as patching hasn't happened yet
(which it hasn't) */
pv_mmu_ops.alloc_pte = xen_alloc_pte;
pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
pv_mmu_ops.release_pte = xen_release_pte;
pv_mmu_ops.release_pmd = xen_release_pmd;
#if CONFIG_PGTABLE_LEVELS >= 4
pv_mmu_ops.alloc_pud = xen_alloc_pud;
pv_mmu_ops.release_pud = xen_release_pud;
#endif
pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte);
#ifdef CONFIG_X86_64
pv_mmu_ops.write_cr3 = &xen_write_cr3;
SetPagePinned(virt_to_page(level3_user_vsyscall));
#endif
xen_mark_init_mm_pinned();
}
static void xen_leave_lazy_mmu(void)
{
preempt_disable();
xen_mc_flush();
paravirt_leave_lazy_mmu();
preempt_enable();
}
static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.read_cr2 = xen_read_cr2,
.write_cr2 = xen_write_cr2,
.read_cr3 = xen_read_cr3,
.write_cr3 = xen_write_cr3_init,
.flush_tlb_user = xen_flush_tlb,
.flush_tlb_kernel = xen_flush_tlb,
.flush_tlb_single = xen_flush_tlb_single,
.flush_tlb_others = xen_flush_tlb_others,
.pte_update = paravirt_nop,
.pgd_alloc = xen_pgd_alloc,
.pgd_free = xen_pgd_free,
.alloc_pte = xen_alloc_pte_init,
.release_pte = xen_release_pte_init,
.alloc_pmd = xen_alloc_pmd_init,
.release_pmd = xen_release_pmd_init,
.set_pte = xen_set_pte_init,
.set_pte_at = xen_set_pte_at,
.set_pmd = xen_set_pmd_hyper,
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
.pte_val = PV_CALLEE_SAVE(xen_pte_val),
.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
.make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
.make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
#ifdef CONFIG_X86_PAE
.set_pte_atomic = xen_set_pte_atomic,
.pte_clear = xen_pte_clear,
.pmd_clear = xen_pmd_clear,
#endif /* CONFIG_X86_PAE */
.set_pud = xen_set_pud_hyper,
.make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
.pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
#if CONFIG_PGTABLE_LEVELS >= 4
.pud_val = PV_CALLEE_SAVE(xen_pud_val),
.make_pud = PV_CALLEE_SAVE(xen_make_pud),
.set_p4d = xen_set_p4d_hyper,
.alloc_pud = xen_alloc_pmd_init,
.release_pud = xen_release_pmd_init,
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
.activate_mm = xen_activate_mm,
.dup_mmap = xen_dup_mmap,
.exit_mmap = xen_exit_mmap,
.lazy_mode = {
.enter = paravirt_enter_lazy_mmu,
.leave = xen_leave_lazy_mmu,
.flush = paravirt_flush_lazy_mmu,
},
.set_fixmap = xen_set_fixmap,
};
void __init xen_init_mmu_ops(void)
{
x86_init.paging.pagetable_init = xen_pagetable_init;
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
pv_mmu_ops = xen_mmu_ops;
memset(dummy_mapping, 0xff, PAGE_SIZE);
}
/* Protected by xen_reservation_lock. */
#define MAX_CONTIG_ORDER 9 /* 2MB */
static unsigned long discontig_frames[1<<MAX_CONTIG_ORDER];
#define VOID_PTE (mfn_pte(0, __pgprot(0)))
static void xen_zap_pfn_range(unsigned long vaddr, unsigned int order,
unsigned long *in_frames,
unsigned long *out_frames)
{
int i;
struct multicall_space mcs;
xen_mc_batch();
for (i = 0; i < (1UL<<order); i++, vaddr += PAGE_SIZE) {
mcs = __xen_mc_entry(0);
if (in_frames)
in_frames[i] = virt_to_mfn(vaddr);
if (virt_addr_valid(vaddr))
return virt_to_machine(vaddr);
MULTI_update_va_mapping(mcs.mc, vaddr, VOID_PTE, 0);
__set_phys_to_machine(virt_to_pfn(vaddr), INVALID_P2M_ENTRY);
/* otherwise we have to do a (slower) full page-table walk */
if (out_frames)
out_frames[i] = virt_to_pfn(vaddr);
}
xen_mc_issue(0);
pte = lookup_address(address, &level);
BUG_ON(pte == NULL);
offset = address & ~PAGE_MASK;
return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
}
EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
/*
* Update the pfn-to-mfn mappings for a virtual address range, either to
* point to an array of mfns, or contiguously from a single starting
* mfn.
*/
static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
unsigned long *mfns,
unsigned long first_mfn)
void xen_flush_tlb_all(void)
{
unsigned i, limit;
unsigned long mfn;
xen_mc_batch();
limit = 1u << order;
for (i = 0; i < limit; i++, vaddr += PAGE_SIZE) {
struct mmuext_op *op;
struct multicall_space mcs;
unsigned flags;
mcs = __xen_mc_entry(0);
if (mfns)
mfn = mfns[i];
else
mfn = first_mfn + i;
if (i < (limit - 1))
flags = 0;
else {
if (order == 0)
flags = UVMF_INVLPG | UVMF_ALL;
else
flags = UVMF_TLB_FLUSH | UVMF_ALL;
}
MULTI_update_va_mapping(mcs.mc, vaddr,
mfn_pte(mfn, PAGE_KERNEL), flags);
set_phys_to_machine(virt_to_pfn(vaddr), mfn);
}
xen_mc_issue(0);
}
/*
* Perform the hypercall to exchange a region of our pfns to point to
* memory with the required contiguous alignment. Takes the pfns as
* input, and populates mfns as output.
*
* Returns a success code indicating whether the hypervisor was able to
* satisfy the request or not.
*/
static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
unsigned long *pfns_in,
unsigned long extents_out,
unsigned int order_out,
unsigned long *mfns_out,
unsigned int address_bits)
{
long rc;
int success;
struct xen_memory_exchange exchange = {
.in = {
.nr_extents = extents_in,
.extent_order = order_in,
.extent_start = pfns_in,
.domid = DOMID_SELF
},
.out = {
.nr_extents = extents_out,
.extent_order = order_out,
.extent_start = mfns_out,
.address_bits = address_bits,
.domid = DOMID_SELF
}
};
BUG_ON(extents_in << order_in != extents_out << order_out);
rc = HYPERVISOR_memory_op(XENMEM_exchange, &exchange);
success = (exchange.nr_exchanged == extents_in);
BUG_ON(!success && ((exchange.nr_exchanged != 0) || (rc == 0)));
BUG_ON(success && (rc != 0));
return success;
}
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
unsigned long *in_frames = discontig_frames, out_frame;
unsigned long flags;
int success;
unsigned long vstart = (unsigned long)phys_to_virt(pstart);
/*
* Currently an auto-translated guest will not perform I/O, nor will
* it require PAE page directories below 4GB. Therefore any calls to
* this function are redundant and can be ignored.
*/
if (xen_feature(XENFEAT_auto_translated_physmap))
return 0;
if (unlikely(order > MAX_CONTIG_ORDER))
return -ENOMEM;
memset((void *) vstart, 0, PAGE_SIZE << order);
spin_lock_irqsave(&xen_reservation_lock, flags);
/* 1. Zap current PTEs, remembering MFNs. */
xen_zap_pfn_range(vstart, order, in_frames, NULL);
/* 2. Get a new contiguous memory extent. */
out_frame = virt_to_pfn(vstart);
success = xen_exchange_memory(1UL << order, 0, in_frames,
1, order, &out_frame,
address_bits);
/* 3. Map the new extent in place of old pages. */
if (success)
xen_remap_exchanged_ptes(vstart, order, NULL, out_frame);
else
xen_remap_exchanged_ptes(vstart, order, in_frames, 0);
spin_unlock_irqrestore(&xen_reservation_lock, flags);
*dma_handle = virt_to_machine(vstart).maddr;
return success ? 0 : -ENOMEM;
}
EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
{
unsigned long *out_frames = discontig_frames, in_frame;
unsigned long flags;
int success;
unsigned long vstart;
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
if (unlikely(order > MAX_CONTIG_ORDER))
return;
vstart = (unsigned long)phys_to_virt(pstart);
memset((void *) vstart, 0, PAGE_SIZE << order);
spin_lock_irqsave(&xen_reservation_lock, flags);
/* 1. Find start MFN of contiguous extent. */
in_frame = virt_to_mfn(vstart);
/* 2. Zap current PTEs. */
xen_zap_pfn_range(vstart, order, NULL, out_frames);
/* 3. Do the exchange for non-contiguous MFNs. */
success = xen_exchange_memory(1, order, &in_frame, 1UL << order,
0, out_frames, 0);
/* 4. Map new pages in place of old pages. */
if (success)
xen_remap_exchanged_ptes(vstart, order, out_frames, 0);
else
xen_remap_exchanged_ptes(vstart, order, NULL, in_frame);
spin_unlock_irqrestore(&xen_reservation_lock, flags);
}
EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
#ifdef CONFIG_XEN_PVHVM
#ifdef CONFIG_PROC_VMCORE
/*
* This function is used in two contexts:
* - the kdump kernel has to check whether a pfn of the crashed kernel
* was a ballooned page. vmcore is using this function to decide
* whether to access a pfn of the crashed kernel.
* - the kexec kernel has to check whether a pfn was ballooned by the
* previous kernel. If the pfn is ballooned, handle it properly.
* Returns 0 if the pfn is not backed by a RAM page, the caller may
* handle the pfn special in this case.
*/
static int xen_oldmem_pfn_is_ram(unsigned long pfn)
{
struct xen_hvm_get_mem_type a = {
.domid = DOMID_SELF,
.pfn = pfn,
};
int ram;
if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
return -ENXIO;
switch (a.mem_type) {
case HVMMEM_mmio_dm:
ram = 0;
break;
case HVMMEM_ram_rw:
case HVMMEM_ram_ro:
default:
ram = 1;
break;
}
return ram;
}
#endif
trace_xen_mmu_flush_tlb_all(0);
static void xen_hvm_exit_mmap(struct mm_struct *mm)
{
struct xen_hvm_pagetable_dying a;
int rc;
preempt_disable();
a.domid = DOMID_SELF;
a.gpa = __pa(mm->pgd);
rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
WARN_ON_ONCE(rc < 0);
}
mcs = xen_mc_entry(sizeof(*op));
static int is_pagetable_dying_supported(void)
{
struct xen_hvm_pagetable_dying a;
int rc = 0;
op = mcs.args;
op->cmd = MMUEXT_TLB_FLUSH_ALL;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
a.domid = DOMID_SELF;
a.gpa = 0x00;
rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
if (rc < 0) {
printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
return 0;
}
return 1;
}
xen_mc_issue(PARAVIRT_LAZY_MMU);
void __init xen_hvm_init_mmu_ops(void)
{
if (is_pagetable_dying_supported())
pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
#ifdef CONFIG_PROC_VMCORE
register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram);
#endif
preempt_enable();
}
#endif
#define REMAP_BATCH_SIZE 16
......@@ -2974,7 +191,6 @@ int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
/* Returns: 0 success */
int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
int numpgs, struct page **pages)
......
arch/x86/xen/mmu_hvm.c 0 → 100644
View file @ a9648072
#include <linux/types.h>
#include <linux/crash_dump.h>
#include <xen/interface/xen.h>
#include <xen/hvm.h>
#include "mmu.h"
#ifdef CONFIG_PROC_VMCORE
/*
* This function is used in two contexts:
* - the kdump kernel has to check whether a pfn of the crashed kernel
* was a ballooned page. vmcore is using this function to decide
* whether to access a pfn of the crashed kernel.
* - the kexec kernel has to check whether a pfn was ballooned by the
* previous kernel. If the pfn is ballooned, handle it properly.
* Returns 0 if the pfn is not backed by a RAM page, the caller may
* handle the pfn special in this case.
*/
static int xen_oldmem_pfn_is_ram(unsigned long pfn)
{
struct xen_hvm_get_mem_type a = {
.domid = DOMID_SELF,
.pfn = pfn,
};
int ram;
if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
return -ENXIO;
switch (a.mem_type) {
case HVMMEM_mmio_dm:
ram = 0;
break;
case HVMMEM_ram_rw:
case HVMMEM_ram_ro:
default:
ram = 1;
break;
}
return ram;
}
#endif
static void xen_hvm_exit_mmap(struct mm_struct *mm)
{
struct xen_hvm_pagetable_dying a;
int rc;
a.domid = DOMID_SELF;
a.gpa = __pa(mm->pgd);
rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
WARN_ON_ONCE(rc < 0);
}
static int is_pagetable_dying_supported(void)
{
struct xen_hvm_pagetable_dying a;
int rc = 0;
a.domid = DOMID_SELF;
a.gpa = 0x00;
rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
if (rc < 0) {
printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
return 0;
}
return 1;
}
void __init xen_hvm_init_mmu_ops(void)
{
if (is_pagetable_dying_supported())
pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
#ifdef CONFIG_PROC_VMCORE
register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram);
#endif
}
arch/x86/xen/mmu_pv.c 0 → 100644
View file @ a9648072
/*
* Xen mmu operations
*
* This file contains the various mmu fetch and update operations.
* The most important job they must perform is the mapping between the
* domain's pfn and the overall machine mfns.
*
* Xen allows guests to directly update the pagetable, in a controlled
* fashion. In other words, the guest modifies the same pagetable
* that the CPU actually uses, which eliminates the overhead of having
* a separate shadow pagetable.
*
* In order to allow this, it falls on the guest domain to map its
* notion of a "physical" pfn - which is just a domain-local linear
* address - into a real "machine address" which the CPU's MMU can
* use.
*
* A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
* inserted directly into the pagetable. When creating a new
* pte/pmd/pgd, it converts the passed pfn into an mfn. Conversely,
* when reading the content back with __(pgd|pmd|pte)_val, it converts
* the mfn back into a pfn.
*
* The other constraint is that all pages which make up a pagetable
* must be mapped read-only in the guest. This prevents uncontrolled
* guest updates to the pagetable. Xen strictly enforces this, and
* will disallow any pagetable update which will end up mapping a
* pagetable page RW, and will disallow using any writable page as a
* pagetable.
*
* Naively, when loading %cr3 with the base of a new pagetable, Xen
* would need to validate the whole pagetable before going on.
* Naturally, this is quite slow. The solution is to "pin" a
* pagetable, which enforces all the constraints on the pagetable even
* when it is not actively in use. This menas that Xen can be assured
* that it is still valid when you do load it into %cr3, and doesn't
* need to revalidate it.
*
* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
*/
#include <linux/sched/mm.h>
#include <linux/highmem.h>
#include <linux/debugfs.h>
#include <linux/bug.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/seq_file.h>
#include <linux/crash_dump.h>
#ifdef CONFIG_KEXEC_CORE
#include <linux/kexec.h>
#endif
#include <trace/events/xen.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/fixmap.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/paravirt.h>
#include <asm/e820/api.h>
#include <asm/linkage.h>
#include <asm/page.h>
#include <asm/init.h>
#include <asm/pat.h>
#include <asm/smp.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/interface/xen.h>
#include <xen/interface/hvm/hvm_op.h>
#include <xen/interface/version.h>
#include <xen/interface/memory.h>
#include <xen/hvc-console.h>
#include "multicalls.h"
#include "mmu.h"
#include "debugfs.h"
#ifdef CONFIG_X86_32
/*
* Identity map, in addition to plain kernel map. This needs to be
* large enough to allocate page table pages to allocate the rest.
* Each page can map 2MB.
*/
#define LEVEL1_IDENT_ENTRIES (PTRS_PER_PTE * 4)
static RESERVE_BRK_ARRAY(pte_t, level1_ident_pgt, LEVEL1_IDENT_ENTRIES);
#endif
#ifdef CONFIG_X86_64
/* l3 pud for userspace vsyscall mapping */
static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
#endif /* CONFIG_X86_64 */
/*
* Note about cr3 (pagetable base) values:
*
* xen_cr3 contains the current logical cr3 value; it contains the
* last set cr3. This may not be the current effective cr3, because
* its update may be being lazily deferred. However, a vcpu looking
* at its own cr3 can use this value knowing that it everything will
* be self-consistent.
*
* xen_current_cr3 contains the actual vcpu cr3; it is set once the
* hypercall to set the vcpu cr3 is complete (so it may be a little
* out of date, but it will never be set early). If one vcpu is
* looking at another vcpu's cr3 value, it should use this variable.
*/
DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
static phys_addr_t xen_pt_base, xen_pt_size __initdata;
/*
* Just beyond the highest usermode address. STACK_TOP_MAX has a
* redzone above it, so round it up to a PGD boundary.
*/
#define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
void make_lowmem_page_readonly(void *vaddr)
{
pte_t *pte, ptev;
unsigned long address = (unsigned long)vaddr;
unsigned int level;
pte = lookup_address(address, &level);
if (pte == NULL)
return; /* vaddr missing */
ptev = pte_wrprotect(*pte);
if (HYPERVISOR_update_va_mapping(address, ptev, 0))
BUG();
}
void make_lowmem_page_readwrite(void *vaddr)
{
pte_t *pte, ptev;
unsigned long address = (unsigned long)vaddr;
unsigned int level;
pte = lookup_address(address, &level);
if (pte == NULL)
return; /* vaddr missing */
ptev = pte_mkwrite(*pte);
if (HYPERVISOR_update_va_mapping(address, ptev, 0))
BUG();
}
static bool xen_page_pinned(void *ptr)
{
struct page *page = virt_to_page(ptr);
return PagePinned(page);
}
void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
{
struct multicall_space mcs;
struct mmu_update *u;
trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
mcs = xen_mc_entry(sizeof(*u));
u = mcs.args;
/* ptep might be kmapped when using 32-bit HIGHPTE */
u->ptr = virt_to_machine(ptep).maddr;
u->val = pte_val_ma(pteval);
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
EXPORT_SYMBOL_GPL(xen_set_domain_pte);
static void xen_extend_mmu_update(const struct mmu_update *update)
{
struct multicall_space mcs;
struct mmu_update *u;
mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
if (mcs.mc != NULL) {
mcs.mc->args[1]++;
} else {
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
u = mcs.args;
*u = *update;
}
static void xen_extend_mmuext_op(const struct mmuext_op *op)
{
struct multicall_space mcs;
struct mmuext_op *u;
mcs = xen_mc_extend_args(__HYPERVISOR_mmuext_op, sizeof(*u));
if (mcs.mc != NULL) {
mcs.mc->args[1]++;
} else {
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
u = mcs.args;
*u = *op;
}
static void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
{
struct mmu_update u;
preempt_disable();
xen_mc_batch();
/* ptr may be ioremapped for 64-bit pagetable setup */
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
u.val = pmd_val_ma(val);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_pmd(pmd_t *ptr, pmd_t val)
{
trace_xen_mmu_set_pmd(ptr, val);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
*ptr = val;
return;
}
xen_set_pmd_hyper(ptr, val);
}
/*
* Associate a virtual page frame with a given physical page frame
* and protection flags for that frame.
*/
void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
{
set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
}
static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)
{
struct mmu_update u;
if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU)
return false;
xen_mc_batch();
u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
u.val = pte_val_ma(pteval);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
return true;
}
static inline void __xen_set_pte(pte_t *ptep, pte_t pteval)
{
if (!xen_batched_set_pte(ptep, pteval)) {
/*
* Could call native_set_pte() here and trap and
* emulate the PTE write but with 32-bit guests this
* needs two traps (one for each of the two 32-bit
* words in the PTE) so do one hypercall directly
* instead.
*/
struct mmu_update u;
u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
u.val = pte_val_ma(pteval);
HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF);
}
}
static void xen_set_pte(pte_t *ptep, pte_t pteval)
{
trace_xen_mmu_set_pte(ptep, pteval);
__xen_set_pte(ptep, pteval);
}
static void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
trace_xen_mmu_set_pte_at(mm, addr, ptep, pteval);
__xen_set_pte(ptep, pteval);
}
pte_t xen_ptep_modify_prot_start(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
/* Just return the pte as-is. We preserve the bits on commit */
trace_xen_mmu_ptep_modify_prot_start(mm, addr, ptep, *ptep);
return *ptep;
}
void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
struct mmu_update u;
trace_xen_mmu_ptep_modify_prot_commit(mm, addr, ptep, pte);
xen_mc_batch();
u.ptr = virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
u.val = pte_val_ma(pte);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
/* Assume pteval_t is equivalent to all the other *val_t types. */
static pteval_t pte_mfn_to_pfn(pteval_t val)
{
if (val & _PAGE_PRESENT) {
unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
unsigned long pfn = mfn_to_pfn(mfn);
pteval_t flags = val & PTE_FLAGS_MASK;
if (unlikely(pfn == ~0))
val = flags & ~_PAGE_PRESENT;
else
val = ((pteval_t)pfn << PAGE_SHIFT) | flags;
}
return val;
}
static pteval_t pte_pfn_to_mfn(pteval_t val)
{
if (val & _PAGE_PRESENT) {
unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
pteval_t flags = val & PTE_FLAGS_MASK;
unsigned long mfn;
if (!xen_feature(XENFEAT_auto_translated_physmap))
mfn = __pfn_to_mfn(pfn);
else
mfn = pfn;
/*
* If there's no mfn for the pfn, then just create an
* empty non-present pte. Unfortunately this loses
* information about the original pfn, so
* pte_mfn_to_pfn is asymmetric.
*/
if (unlikely(mfn == INVALID_P2M_ENTRY)) {
mfn = 0;
flags = 0;
} else
mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
}
return val;
}
__visible pteval_t xen_pte_val(pte_t pte)
{
pteval_t pteval = pte.pte;
return pte_mfn_to_pfn(pteval);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
__visible pgdval_t xen_pgd_val(pgd_t pgd)
{
return pte_mfn_to_pfn(pgd.pgd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
__visible pte_t xen_make_pte(pteval_t pte)
{
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
__visible pgd_t xen_make_pgd(pgdval_t pgd)
{
pgd = pte_pfn_to_mfn(pgd);
return native_make_pgd(pgd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pgd);
__visible pmdval_t xen_pmd_val(pmd_t pmd)
{
return pte_mfn_to_pfn(pmd.pmd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pmd_val);
static void xen_set_pud_hyper(pud_t *ptr, pud_t val)
{
struct mmu_update u;
preempt_disable();
xen_mc_batch();
/* ptr may be ioremapped for 64-bit pagetable setup */
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
u.val = pud_val_ma(val);
xen_extend_mmu_update(&u);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_pud(pud_t *ptr, pud_t val)
{
trace_xen_mmu_set_pud(ptr, val);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
*ptr = val;
return;
}
xen_set_pud_hyper(ptr, val);
}
#ifdef CONFIG_X86_PAE
static void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
{
trace_xen_mmu_set_pte_atomic(ptep, pte);
set_64bit((u64 *)ptep, native_pte_val(pte));
}
static void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
trace_xen_mmu_pte_clear(mm, addr, ptep);
if (!xen_batched_set_pte(ptep, native_make_pte(0)))
native_pte_clear(mm, addr, ptep);
}
static void xen_pmd_clear(pmd_t *pmdp)
{
trace_xen_mmu_pmd_clear(pmdp);
set_pmd(pmdp, __pmd(0));
}
#endif /* CONFIG_X86_PAE */
__visible pmd_t xen_make_pmd(pmdval_t pmd)
{
pmd = pte_pfn_to_mfn(pmd);
return native_make_pmd(pmd);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pmd);
#if CONFIG_PGTABLE_LEVELS == 4
__visible pudval_t xen_pud_val(pud_t pud)
{
return pte_mfn_to_pfn(pud.pud);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pud_val);
__visible pud_t xen_make_pud(pudval_t pud)
{
pud = pte_pfn_to_mfn(pud);
return native_make_pud(pud);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pud);
static pgd_t *xen_get_user_pgd(pgd_t *pgd)
{
pgd_t *pgd_page = (pgd_t *)(((unsigned long)pgd) & PAGE_MASK);
unsigned offset = pgd - pgd_page;
pgd_t *user_ptr = NULL;
if (offset < pgd_index(USER_LIMIT)) {
struct page *page = virt_to_page(pgd_page);
user_ptr = (pgd_t *)page->private;
if (user_ptr)
user_ptr += offset;
}
return user_ptr;
}
static void __xen_set_p4d_hyper(p4d_t *ptr, p4d_t val)
{
struct mmu_update u;
u.ptr = virt_to_machine(ptr).maddr;
u.val = p4d_val_ma(val);
xen_extend_mmu_update(&u);
}
/*
* Raw hypercall-based set_p4d, intended for in early boot before
* there's a page structure. This implies:
* 1. The only existing pagetable is the kernel's
* 2. It is always pinned
* 3. It has no user pagetable attached to it
*/
static void __init xen_set_p4d_hyper(p4d_t *ptr, p4d_t val)
{
preempt_disable();
xen_mc_batch();
__xen_set_p4d_hyper(ptr, val);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_p4d(p4d_t *ptr, p4d_t val)
{
pgd_t *user_ptr = xen_get_user_pgd((pgd_t *)ptr);
pgd_t pgd_val;
trace_xen_mmu_set_p4d(ptr, (p4d_t *)user_ptr, val);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
*ptr = val;
if (user_ptr) {
WARN_ON(xen_page_pinned(user_ptr));
pgd_val.pgd = p4d_val_ma(val);
*user_ptr = pgd_val;
}
return;
}
/* If it's pinned, then we can at least batch the kernel and
user updates together. */
xen_mc_batch();
__xen_set_p4d_hyper(ptr, val);
if (user_ptr)
__xen_set_p4d_hyper((p4d_t *)user_ptr, val);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
static int xen_pmd_walk(struct mm_struct *mm, pmd_t *pmd,
int (*func)(struct mm_struct *mm, struct page *, enum pt_level),
bool last, unsigned long limit)
{
int i, nr, flush = 0;
nr = last ? pmd_index(limit) + 1 : PTRS_PER_PMD;
for (i = 0; i < nr; i++) {
if (!pmd_none(pmd[i]))
flush |= (*func)(mm, pmd_page(pmd[i]), PT_PTE);
}
return flush;
}
static int xen_pud_walk(struct mm_struct *mm, pud_t *pud,
int (*func)(struct mm_struct *mm, struct page *, enum pt_level),
bool last, unsigned long limit)
{
int i, nr, flush = 0;
nr = last ? pud_index(limit) + 1 : PTRS_PER_PUD;
for (i = 0; i < nr; i++) {
pmd_t *pmd;
if (pud_none(pud[i]))
continue;
pmd = pmd_offset(&pud[i], 0);
if (PTRS_PER_PMD > 1)
flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
flush |= xen_pmd_walk(mm, pmd, func,
last && i == nr - 1, limit);
}
return flush;
}
static int xen_p4d_walk(struct mm_struct *mm, p4d_t *p4d,
int (*func)(struct mm_struct *mm, struct page *, enum pt_level),
bool last, unsigned long limit)
{
int i, nr, flush = 0;
nr = last ? p4d_index(limit) + 1 : PTRS_PER_P4D;
for (i = 0; i < nr; i++) {
pud_t *pud;
if (p4d_none(p4d[i]))
continue;
pud = pud_offset(&p4d[i], 0);
if (PTRS_PER_PUD > 1)
flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
flush |= xen_pud_walk(mm, pud, func,
last && i == nr - 1, limit);
}
return flush;
}
/*
* (Yet another) pagetable walker. This one is intended for pinning a
* pagetable. This means that it walks a pagetable and calls the
* callback function on each page it finds making up the page table,
* at every level. It walks the entire pagetable, but it only bothers
* pinning pte pages which are below limit. In the normal case this
* will be STACK_TOP_MAX, but at boot we need to pin up to
* FIXADDR_TOP.
*
* For 32-bit the important bit is that we don't pin beyond there,
* because then we start getting into Xen's ptes.
*
* For 64-bit, we must skip the Xen hole in the middle of the address
* space, just after the big x86-64 virtual hole.
*/
static int __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
int (*func)(struct mm_struct *mm, struct page *,
enum pt_level),
unsigned long limit)
{
int i, nr, flush = 0;
unsigned hole_low, hole_high;
/* The limit is the last byte to be touched */
limit--;
BUG_ON(limit >= FIXADDR_TOP);
if (xen_feature(XENFEAT_auto_translated_physmap))
return 0;
/*
* 64-bit has a great big hole in the middle of the address
* space, which contains the Xen mappings. On 32-bit these
* will end up making a zero-sized hole and so is a no-op.
*/
hole_low = pgd_index(USER_LIMIT);
hole_high = pgd_index(PAGE_OFFSET);
nr = pgd_index(limit) + 1;
for (i = 0; i < nr; i++) {
p4d_t *p4d;
if (i >= hole_low && i < hole_high)
continue;
if (pgd_none(pgd[i]))
continue;
p4d = p4d_offset(&pgd[i], 0);
if (PTRS_PER_P4D > 1)
flush |= (*func)(mm, virt_to_page(p4d), PT_P4D);
flush |= xen_p4d_walk(mm, p4d, func, i == nr - 1, limit);
}
/* Do the top level last, so that the callbacks can use it as
a cue to do final things like tlb flushes. */
flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
return flush;
}
static int xen_pgd_walk(struct mm_struct *mm,
int (*func)(struct mm_struct *mm, struct page *,
enum pt_level),
unsigned long limit)
{
return __xen_pgd_walk(mm, mm->pgd, func, limit);
}
/* If we're using split pte locks, then take the page's lock and
return a pointer to it. Otherwise return NULL. */
static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
{
spinlock_t *ptl = NULL;
#if USE_SPLIT_PTE_PTLOCKS
ptl = ptlock_ptr(page);
spin_lock_nest_lock(ptl, &mm->page_table_lock);
#endif
return ptl;
}
static void xen_pte_unlock(void *v)
{
spinlock_t *ptl = v;
spin_unlock(ptl);
}
static void xen_do_pin(unsigned level, unsigned long pfn)
{
struct mmuext_op op;
op.cmd = level;
op.arg1.mfn = pfn_to_mfn(pfn);
xen_extend_mmuext_op(&op);
}
static int xen_pin_page(struct mm_struct *mm, struct page *page,
enum pt_level level)
{
unsigned pgfl = TestSetPagePinned(page);
int flush;
if (pgfl)
flush = 0; /* already pinned */
else if (PageHighMem(page))
/* kmaps need flushing if we found an unpinned
highpage */
flush = 1;
else {
void *pt = lowmem_page_address(page);
unsigned long pfn = page_to_pfn(page);
struct multicall_space mcs = __xen_mc_entry(0);
spinlock_t *ptl;
flush = 0;
/*
* We need to hold the pagetable lock between the time
* we make the pagetable RO and when we actually pin
* it. If we don't, then other users may come in and
* attempt to update the pagetable by writing it,
* which will fail because the memory is RO but not
* pinned, so Xen won't do the trap'n'emulate.
*
* If we're using split pte locks, we can't hold the
* entire pagetable's worth of locks during the
* traverse, because we may wrap the preempt count (8
* bits). The solution is to mark RO and pin each PTE
* page while holding the lock. This means the number
* of locks we end up holding is never more than a
* batch size (~32 entries, at present).
*
* If we're not using split pte locks, we needn't pin
* the PTE pages independently, because we're
* protected by the overall pagetable lock.
*/
ptl = NULL;
if (level == PT_PTE)
ptl = xen_pte_lock(page, mm);
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
pfn_pte(pfn, PAGE_KERNEL_RO),
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
if (ptl) {
xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
/* Queue a deferred unlock for when this batch
is completed. */
xen_mc_callback(xen_pte_unlock, ptl);
}
}
return flush;
}
/* This is called just after a mm has been created, but it has not
been used yet. We need to make sure that its pagetable is all
read-only, and can be pinned. */
static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
{
trace_xen_mmu_pgd_pin(mm, pgd);
xen_mc_batch();
if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
/* re-enable interrupts for flushing */
xen_mc_issue(0);
kmap_flush_unused();
xen_mc_batch();
}
#ifdef CONFIG_X86_64
{
pgd_t *user_pgd = xen_get_user_pgd(pgd);
xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
if (user_pgd) {
xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
xen_do_pin(MMUEXT_PIN_L4_TABLE,
PFN_DOWN(__pa(user_pgd)));
}
}
#else /* CONFIG_X86_32 */
#ifdef CONFIG_X86_PAE
/* Need to make sure unshared kernel PMD is pinnable */
xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
PT_PMD);
#endif
xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
#endif /* CONFIG_X86_64 */
xen_mc_issue(0);
}
static void xen_pgd_pin(struct mm_struct *mm)
{
__xen_pgd_pin(mm, mm->pgd);
}
/*
* On save, we need to pin all pagetables to make sure they get their
* mfns turned into pfns. Search the list for any unpinned pgds and pin
* them (unpinned pgds are not currently in use, probably because the
* process is under construction or destruction).
*
* Expected to be called in stop_machine() ("equivalent to taking
* every spinlock in the system"), so the locking doesn't really
* matter all that much.
*/
void xen_mm_pin_all(void)
{
struct page *page;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
if (!PagePinned(page)) {
__xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
SetPageSavePinned(page);
}
}
spin_unlock(&pgd_lock);
}
/*
* The init_mm pagetable is really pinned as soon as its created, but
* that's before we have page structures to store the bits. So do all
* the book-keeping now.
*/
static int __init xen_mark_pinned(struct mm_struct *mm, struct page *page,
enum pt_level level)
{
SetPagePinned(page);
return 0;
}
static void __init xen_mark_init_mm_pinned(void)
{
xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
}
static int xen_unpin_page(struct mm_struct *mm, struct page *page,
enum pt_level level)
{
unsigned pgfl = TestClearPagePinned(page);
if (pgfl && !PageHighMem(page)) {
void *pt = lowmem_page_address(page);
unsigned long pfn = page_to_pfn(page);
spinlock_t *ptl = NULL;
struct multicall_space mcs;
/*
* Do the converse to pin_page. If we're using split
* pte locks, we must be holding the lock for while
* the pte page is unpinned but still RO to prevent
* concurrent updates from seeing it in this
* partially-pinned state.
*/
if (level == PT_PTE) {
ptl = xen_pte_lock(page, mm);
if (ptl)
xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
}
mcs = __xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
pfn_pte(pfn, PAGE_KERNEL),
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
if (ptl) {
/* unlock when batch completed */
xen_mc_callback(xen_pte_unlock, ptl);
}
}
return 0; /* never need to flush on unpin */
}
/* Release a pagetables pages back as normal RW */
static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
{
trace_xen_mmu_pgd_unpin(mm, pgd);
xen_mc_batch();
xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
#ifdef CONFIG_X86_64
{
pgd_t *user_pgd = xen_get_user_pgd(pgd);
if (user_pgd) {
xen_do_pin(MMUEXT_UNPIN_TABLE,
PFN_DOWN(__pa(user_pgd)));
xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
}
}
#endif
#ifdef CONFIG_X86_PAE
/* Need to make sure unshared kernel PMD is unpinned */
xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
PT_PMD);
#endif
__xen_pgd_walk(mm, pgd, xen_unpin_page, USER_LIMIT);
xen_mc_issue(0);
}
static void xen_pgd_unpin(struct mm_struct *mm)
{
__xen_pgd_unpin(mm, mm->pgd);
}
/*
* On resume, undo any pinning done at save, so that the rest of the
* kernel doesn't see any unexpected pinned pagetables.
*/
void xen_mm_unpin_all(void)
{
struct page *page;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
if (PageSavePinned(page)) {
BUG_ON(!PagePinned(page));
__xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
ClearPageSavePinned(page);
}
}
spin_unlock(&pgd_lock);
}
static void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
spin_lock(&next->page_table_lock);
xen_pgd_pin(next);
spin_unlock(&next->page_table_lock);
}
static void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{
spin_lock(&mm->page_table_lock);
xen_pgd_pin(mm);
spin_unlock(&mm->page_table_lock);
}
#ifdef CONFIG_SMP
/* Another cpu may still have their %cr3 pointing at the pagetable, so
we need to repoint it somewhere else before we can unpin it. */
static void drop_other_mm_ref(void *info)
{
struct mm_struct *mm = info;
struct mm_struct *active_mm;
active_mm = this_cpu_read(cpu_tlbstate.active_mm);
if (active_mm == mm && this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
leave_mm(smp_processor_id());
/* If this cpu still has a stale cr3 reference, then make sure
it has been flushed. */
if (this_cpu_read(xen_current_cr3) == __pa(mm->pgd))
load_cr3(swapper_pg_dir);
}
static void xen_drop_mm_ref(struct mm_struct *mm)
{
cpumask_var_t mask;
unsigned cpu;
if (current->active_mm == mm) {
if (current->mm == mm)
load_cr3(swapper_pg_dir);
else
leave_mm(smp_processor_id());
}
/* Get the "official" set of cpus referring to our pagetable. */
if (!alloc_cpumask_var(&mask, GFP_ATOMIC)) {
for_each_online_cpu(cpu) {
if (!cpumask_test_cpu(cpu, mm_cpumask(mm))
&& per_cpu(xen_current_cr3, cpu) != __pa(mm->pgd))
continue;
smp_call_function_single(cpu, drop_other_mm_ref, mm, 1);
}
return;
}
cpumask_copy(mask, mm_cpumask(mm));
/* It's possible that a vcpu may have a stale reference to our
cr3, because its in lazy mode, and it hasn't yet flushed
its set of pending hypercalls yet. In this case, we can
look at its actual current cr3 value, and force it to flush
if needed. */
for_each_online_cpu(cpu) {
if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd))
cpumask_set_cpu(cpu, mask);
}
if (!cpumask_empty(mask))
smp_call_function_many(mask, drop_other_mm_ref, mm, 1);
free_cpumask_var(mask);
}
#else
static void xen_drop_mm_ref(struct mm_struct *mm)
{
if (current->active_mm == mm)
load_cr3(swapper_pg_dir);
}
#endif
/*
* While a process runs, Xen pins its pagetables, which means that the
* hypervisor forces it to be read-only, and it controls all updates
* to it. This means that all pagetable updates have to go via the
* hypervisor, which is moderately expensive.
*
* Since we're pulling the pagetable down, we switch to use init_mm,
* unpin old process pagetable and mark it all read-write, which
* allows further operations on it to be simple memory accesses.
*
* The only subtle point is that another CPU may be still using the
* pagetable because of lazy tlb flushing. This means we need need to
* switch all CPUs off this pagetable before we can unpin it.
*/
static void xen_exit_mmap(struct mm_struct *mm)
{
get_cpu(); /* make sure we don't move around */
xen_drop_mm_ref(mm);
put_cpu();
spin_lock(&mm->page_table_lock);
/* pgd may not be pinned in the error exit path of execve */
if (xen_page_pinned(mm->pgd))
xen_pgd_unpin(mm);
spin_unlock(&mm->page_table_lock);
}
static void xen_post_allocator_init(void);
static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
{
struct mmuext_op op;
op.cmd = cmd;
op.arg1.mfn = pfn_to_mfn(pfn);
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
}
#ifdef CONFIG_X86_64
static void __init xen_cleanhighmap(unsigned long vaddr,
unsigned long vaddr_end)
{
unsigned long kernel_end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
pmd_t *pmd = level2_kernel_pgt + pmd_index(vaddr);
/* NOTE: The loop is more greedy than the cleanup_highmap variant.
* We include the PMD passed in on _both_ boundaries. */
for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));
pmd++, vaddr += PMD_SIZE) {
if (pmd_none(*pmd))
continue;
if (vaddr < (unsigned long) _text || vaddr > kernel_end)
set_pmd(pmd, __pmd(0));
}
/* In case we did something silly, we should crash in this function
* instead of somewhere later and be confusing. */
xen_mc_flush();
}
/*
* Make a page range writeable and free it.
*/
static void __init xen_free_ro_pages(unsigned long paddr, unsigned long size)
{
void *vaddr = __va(paddr);
void *vaddr_end = vaddr + size;
for (; vaddr < vaddr_end; vaddr += PAGE_SIZE)
make_lowmem_page_readwrite(vaddr);
memblock_free(paddr, size);
}
static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl, bool unpin)
{
unsigned long pa = __pa(pgtbl) & PHYSICAL_PAGE_MASK;
if (unpin)
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
ClearPagePinned(virt_to_page(__va(pa)));
xen_free_ro_pages(pa, PAGE_SIZE);
}
static void __init xen_cleanmfnmap_pmd(pmd_t *pmd, bool unpin)
{
unsigned long pa;
pte_t *pte_tbl;
int i;
if (pmd_large(*pmd)) {
pa = pmd_val(*pmd) & PHYSICAL_PAGE_MASK;
xen_free_ro_pages(pa, PMD_SIZE);
return;
}
pte_tbl = pte_offset_kernel(pmd, 0);
for (i = 0; i < PTRS_PER_PTE; i++) {
if (pte_none(pte_tbl[i]))
continue;
pa = pte_pfn(pte_tbl[i]) << PAGE_SHIFT;
xen_free_ro_pages(pa, PAGE_SIZE);
}
set_pmd(pmd, __pmd(0));
xen_cleanmfnmap_free_pgtbl(pte_tbl, unpin);
}
static void __init xen_cleanmfnmap_pud(pud_t *pud, bool unpin)
{
unsigned long pa;
pmd_t *pmd_tbl;
int i;
if (pud_large(*pud)) {
pa = pud_val(*pud) & PHYSICAL_PAGE_MASK;
xen_free_ro_pages(pa, PUD_SIZE);
return;
}
pmd_tbl = pmd_offset(pud, 0);
for (i = 0; i < PTRS_PER_PMD; i++) {
if (pmd_none(pmd_tbl[i]))
continue;
xen_cleanmfnmap_pmd(pmd_tbl + i, unpin);
}
set_pud(pud, __pud(0));
xen_cleanmfnmap_free_pgtbl(pmd_tbl, unpin);
}
static void __init xen_cleanmfnmap_p4d(p4d_t *p4d, bool unpin)
{
unsigned long pa;
pud_t *pud_tbl;
int i;
if (p4d_large(*p4d)) {
pa = p4d_val(*p4d) & PHYSICAL_PAGE_MASK;
xen_free_ro_pages(pa, P4D_SIZE);
return;
}
pud_tbl = pud_offset(p4d, 0);
for (i = 0; i < PTRS_PER_PUD; i++) {
if (pud_none(pud_tbl[i]))
continue;
xen_cleanmfnmap_pud(pud_tbl + i, unpin);
}
set_p4d(p4d, __p4d(0));
xen_cleanmfnmap_free_pgtbl(pud_tbl, unpin);
}
/*
* Since it is well isolated we can (and since it is perhaps large we should)
* also free the page tables mapping the initial P->M table.
*/
static void __init xen_cleanmfnmap(unsigned long vaddr)
{
pgd_t *pgd;
p4d_t *p4d;
unsigned int i;
bool unpin;
unpin = (vaddr == 2 * PGDIR_SIZE);
vaddr &= PMD_MASK;
pgd = pgd_offset_k(vaddr);
p4d = p4d_offset(pgd, 0);
for (i = 0; i < PTRS_PER_P4D; i++) {
if (p4d_none(p4d[i]))
continue;
xen_cleanmfnmap_p4d(p4d + i, unpin);
}
if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
set_pgd(pgd, __pgd(0));
xen_cleanmfnmap_free_pgtbl(p4d, unpin);
}
}
static void __init xen_pagetable_p2m_free(void)
{
unsigned long size;
unsigned long addr;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
/* No memory or already called. */
if ((unsigned long)xen_p2m_addr == xen_start_info->mfn_list)
return;
/* using __ka address and sticking INVALID_P2M_ENTRY! */
memset((void *)xen_start_info->mfn_list, 0xff, size);
addr = xen_start_info->mfn_list;
/*
* We could be in __ka space.
* We roundup to the PMD, which means that if anybody at this stage is
* using the __ka address of xen_start_info or
* xen_start_info->shared_info they are in going to crash. Fortunatly
* we have already revectored in xen_setup_kernel_pagetable and in
* xen_setup_shared_info.
*/
size = roundup(size, PMD_SIZE);
if (addr >= __START_KERNEL_map) {
xen_cleanhighmap(addr, addr + size);
size = PAGE_ALIGN(xen_start_info->nr_pages *
sizeof(unsigned long));
memblock_free(__pa(addr), size);
} else {
xen_cleanmfnmap(addr);
}
}
static void __init xen_pagetable_cleanhighmap(void)
{
unsigned long size;
unsigned long addr;
/* At this stage, cleanup_highmap has already cleaned __ka space
* from _brk_limit way up to the max_pfn_mapped (which is the end of
* the ramdisk). We continue on, erasing PMD entries that point to page
* tables - do note that they are accessible at this stage via __va.
* For good measure we also round up to the PMD - which means that if
* anybody is using __ka address to the initial boot-stack - and try
* to use it - they are going to crash. The xen_start_info has been
* taken care of already in xen_setup_kernel_pagetable. */
addr = xen_start_info->pt_base;
size = roundup(xen_start_info->nr_pt_frames * PAGE_SIZE, PMD_SIZE);
xen_cleanhighmap(addr, addr + size);
xen_start_info->pt_base = (unsigned long)__va(__pa(xen_start_info->pt_base));
#ifdef DEBUG
/* This is superfluous and is not necessary, but you know what
* lets do it. The MODULES_VADDR -> MODULES_END should be clear of
* anything at this stage. */
xen_cleanhighmap(MODULES_VADDR, roundup(MODULES_VADDR, PUD_SIZE) - 1);
#endif
}
#endif
static void __init xen_pagetable_p2m_setup(void)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
xen_vmalloc_p2m_tree();
#ifdef CONFIG_X86_64
xen_pagetable_p2m_free();
xen_pagetable_cleanhighmap();
#endif
/* And revector! Bye bye old array */
xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
}
static void __init xen_pagetable_init(void)
{
paging_init();
xen_post_allocator_init();
xen_pagetable_p2m_setup();
/* Allocate and initialize top and mid mfn levels for p2m structure */
xen_build_mfn_list_list();
/* Remap memory freed due to conflicts with E820 map */
if (!xen_feature(XENFEAT_auto_translated_physmap))
xen_remap_memory();
xen_setup_shared_info();
}
static void xen_write_cr2(unsigned long cr2)
{
this_cpu_read(xen_vcpu)->arch.cr2 = cr2;
}
static unsigned long xen_read_cr2(void)
{
return this_cpu_read(xen_vcpu)->arch.cr2;
}
unsigned long xen_read_cr2_direct(void)
{
return this_cpu_read(xen_vcpu_info.arch.cr2);
}
static void xen_flush_tlb(void)
{
struct mmuext_op *op;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb(0);
preempt_disable();
mcs = xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_flush_tlb_single(unsigned long addr)
{
struct mmuext_op *op;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb_single(addr);
preempt_disable();
mcs = xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_INVLPG_LOCAL;
op->arg1.linear_addr = addr & PAGE_MASK;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_flush_tlb_others(const struct cpumask *cpus,
struct mm_struct *mm, unsigned long start,
unsigned long end)
{
struct {
struct mmuext_op op;
#ifdef CONFIG_SMP
DECLARE_BITMAP(mask, num_processors);
#else
DECLARE_BITMAP(mask, NR_CPUS);
#endif
} *args;
struct multicall_space mcs;
trace_xen_mmu_flush_tlb_others(cpus, mm, start, end);
if (cpumask_empty(cpus))
return; /* nothing to do */
mcs = xen_mc_entry(sizeof(*args));
args = mcs.args;
args->op.arg2.vcpumask = to_cpumask(args->mask);
/* Remove us, and any offline CPUS. */
cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
if (end != TLB_FLUSH_ALL && (end - start) <= PAGE_SIZE) {
args->op.cmd = MMUEXT_INVLPG_MULTI;
args->op.arg1.linear_addr = start;
}
MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static unsigned long xen_read_cr3(void)
{
return this_cpu_read(xen_cr3);
}
static void set_current_cr3(void *v)
{
this_cpu_write(xen_current_cr3, (unsigned long)v);
}
static void __xen_write_cr3(bool kernel, unsigned long cr3)
{
struct mmuext_op op;
unsigned long mfn;
trace_xen_mmu_write_cr3(kernel, cr3);
if (cr3)
mfn = pfn_to_mfn(PFN_DOWN(cr3));
else
mfn = 0;
WARN_ON(mfn == 0 && kernel);
op.cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
op.arg1.mfn = mfn;
xen_extend_mmuext_op(&op);
if (kernel) {
this_cpu_write(xen_cr3, cr3);
/* Update xen_current_cr3 once the batch has actually
been submitted. */
xen_mc_callback(set_current_cr3, (void *)cr3);
}
}
static void xen_write_cr3(unsigned long cr3)
{
BUG_ON(preemptible());
xen_mc_batch(); /* disables interrupts */
/* Update while interrupts are disabled, so its atomic with
respect to ipis */
this_cpu_write(xen_cr3, cr3);
__xen_write_cr3(true, cr3);
#ifdef CONFIG_X86_64
{
pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
if (user_pgd)
__xen_write_cr3(false, __pa(user_pgd));
else
__xen_write_cr3(false, 0);
}
#endif
xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
}
#ifdef CONFIG_X86_64
/*
* At the start of the day - when Xen launches a guest, it has already
* built pagetables for the guest. We diligently look over them
* in xen_setup_kernel_pagetable and graft as appropriate them in the
* init_level4_pgt and its friends. Then when we are happy we load
* the new init_level4_pgt - and continue on.
*
* The generic code starts (start_kernel) and 'init_mem_mapping' sets
* up the rest of the pagetables. When it has completed it loads the cr3.
* N.B. that baremetal would start at 'start_kernel' (and the early
* #PF handler would create bootstrap pagetables) - so we are running
* with the same assumptions as what to do when write_cr3 is executed
* at this point.
*
* Since there are no user-page tables at all, we have two variants
* of xen_write_cr3 - the early bootup (this one), and the late one
* (xen_write_cr3). The reason we have to do that is that in 64-bit
* the Linux kernel and user-space are both in ring 3 while the
* hypervisor is in ring 0.
*/
static void __init xen_write_cr3_init(unsigned long cr3)
{
BUG_ON(preemptible());
xen_mc_batch(); /* disables interrupts */
/* Update while interrupts are disabled, so its atomic with
respect to ipis */
this_cpu_write(xen_cr3, cr3);
__xen_write_cr3(true, cr3);
xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
}
#endif
static int xen_pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd = mm->pgd;
int ret = 0;
BUG_ON(PagePinned(virt_to_page(pgd)));
#ifdef CONFIG_X86_64
{
struct page *page = virt_to_page(pgd);
pgd_t *user_pgd;
BUG_ON(page->private != 0);
ret = -ENOMEM;
user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
page->private = (unsigned long)user_pgd;
if (user_pgd != NULL) {
#ifdef CONFIG_X86_VSYSCALL_EMULATION
user_pgd[pgd_index(VSYSCALL_ADDR)] =
__pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
#endif
ret = 0;
}
BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
}
#endif
return ret;
}
static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
#ifdef CONFIG_X86_64
pgd_t *user_pgd = xen_get_user_pgd(pgd);
if (user_pgd)
free_page((unsigned long)user_pgd);
#endif
}
/*
* Init-time set_pte while constructing initial pagetables, which
* doesn't allow RO page table pages to be remapped RW.
*
* If there is no MFN for this PFN then this page is initially
* ballooned out so clear the PTE (as in decrease_reservation() in
* drivers/xen/balloon.c).
*
* Many of these PTE updates are done on unpinned and writable pages
* and doing a hypercall for these is unnecessary and expensive. At
* this point it is not possible to tell if a page is pinned or not,
* so always write the PTE directly and rely on Xen trapping and
* emulating any updates as necessary.
*/
__visible pte_t xen_make_pte_init(pteval_t pte)
{
#ifdef CONFIG_X86_64
unsigned long pfn;
/*
* Pages belonging to the initial p2m list mapped outside the default
* address range must be mapped read-only. This region contains the
* page tables for mapping the p2m list, too, and page tables MUST be
* mapped read-only.
*/
pfn = (pte & PTE_PFN_MASK) >> PAGE_SHIFT;
if (xen_start_info->mfn_list < __START_KERNEL_map &&
pfn >= xen_start_info->first_p2m_pfn &&
pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
pte &= ~_PAGE_RW;
#endif
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_init);
static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
{
#ifdef CONFIG_X86_32
/* If there's an existing pte, then don't allow _PAGE_RW to be set */
if (pte_mfn(pte) != INVALID_P2M_ENTRY
&& pte_val_ma(*ptep) & _PAGE_PRESENT)
pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
pte_val_ma(pte));
#endif
native_set_pte(ptep, pte);
}
/* Early in boot, while setting up the initial pagetable, assume
everything is pinned. */
static void __init xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
{
#ifdef CONFIG_FLATMEM
BUG_ON(mem_map); /* should only be used early */
#endif
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
}
/* Used for pmd and pud */
static void __init xen_alloc_pmd_init(struct mm_struct *mm, unsigned long pfn)
{
#ifdef CONFIG_FLATMEM
BUG_ON(mem_map); /* should only be used early */
#endif
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
}
/* Early release_pte assumes that all pts are pinned, since there's
only init_mm and anything attached to that is pinned. */
static void __init xen_release_pte_init(unsigned long pfn)
{
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
static void __init xen_release_pmd_init(unsigned long pfn)
{
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
static inline void __pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
{
struct multicall_space mcs;
struct mmuext_op *op;
mcs = __xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = cmd;
op->arg1.mfn = pfn_to_mfn(pfn);
MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
static inline void __set_pfn_prot(unsigned long pfn, pgprot_t prot)
{
struct multicall_space mcs;
unsigned long addr = (unsigned long)__va(pfn << PAGE_SHIFT);
mcs = __xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, (unsigned long)addr,
pfn_pte(pfn, prot), 0);
}
/* This needs to make sure the new pte page is pinned iff its being
attached to a pinned pagetable. */
static inline void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn,
unsigned level)
{
bool pinned = PagePinned(virt_to_page(mm->pgd));
trace_xen_mmu_alloc_ptpage(mm, pfn, level, pinned);
if (pinned) {
struct page *page = pfn_to_page(pfn);
SetPagePinned(page);
if (!PageHighMem(page)) {
xen_mc_batch();
__set_pfn_prot(pfn, PAGE_KERNEL_RO);
if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
__pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
xen_mc_issue(PARAVIRT_LAZY_MMU);
} else {
/* make sure there are no stray mappings of
this page */
kmap_flush_unused();
}
}
}
static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PTE);
}
static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PMD);
}
/* This should never happen until we're OK to use struct page */
static inline void xen_release_ptpage(unsigned long pfn, unsigned level)
{
struct page *page = pfn_to_page(pfn);
bool pinned = PagePinned(page);
trace_xen_mmu_release_ptpage(pfn, level, pinned);
if (pinned) {
if (!PageHighMem(page)) {
xen_mc_batch();
if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
__pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
__set_pfn_prot(pfn, PAGE_KERNEL);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
ClearPagePinned(page);
}
}
static void xen_release_pte(unsigned long pfn)
{
xen_release_ptpage(pfn, PT_PTE);
}
static void xen_release_pmd(unsigned long pfn)
{
xen_release_ptpage(pfn, PT_PMD);
}
#if CONFIG_PGTABLE_LEVELS >= 4
static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PUD);
}
static void xen_release_pud(unsigned long pfn)
{
xen_release_ptpage(pfn, PT_PUD);
}
#endif
void __init xen_reserve_top(void)
{
#ifdef CONFIG_X86_32
unsigned long top = HYPERVISOR_VIRT_START;
struct xen_platform_parameters pp;
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
top = pp.virt_start;
reserve_top_address(-top);
#endif /* CONFIG_X86_32 */
}
/*
* Like __va(), but returns address in the kernel mapping (which is
* all we have until the physical memory mapping has been set up.
*/
static void * __init __ka(phys_addr_t paddr)
{
#ifdef CONFIG_X86_64
return (void *)(paddr + __START_KERNEL_map);
#else
return __va(paddr);
#endif
}
/* Convert a machine address to physical address */
static unsigned long __init m2p(phys_addr_t maddr)
{
phys_addr_t paddr;
maddr &= PTE_PFN_MASK;
paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
return paddr;
}
/* Convert a machine address to kernel virtual */
static void * __init m2v(phys_addr_t maddr)
{
return __ka(m2p(maddr));
}
/* Set the page permissions on an identity-mapped pages */
static void __init set_page_prot_flags(void *addr, pgprot_t prot,
unsigned long flags)
{
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
pte_t pte = pfn_pte(pfn, prot);
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
BUG();
}
static void __init set_page_prot(void *addr, pgprot_t prot)
{
return set_page_prot_flags(addr, prot, UVMF_NONE);
}
#ifdef CONFIG_X86_32
static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
{
unsigned pmdidx, pteidx;
unsigned ident_pte;
unsigned long pfn;
level1_ident_pgt = extend_brk(sizeof(pte_t) * LEVEL1_IDENT_ENTRIES,
PAGE_SIZE);
ident_pte = 0;
pfn = 0;
for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
pte_t *pte_page;
/* Reuse or allocate a page of ptes */
if (pmd_present(pmd[pmdidx]))
pte_page = m2v(pmd[pmdidx].pmd);
else {
/* Check for free pte pages */
if (ident_pte == LEVEL1_IDENT_ENTRIES)
break;
pte_page = &level1_ident_pgt[ident_pte];
ident_pte += PTRS_PER_PTE;
pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
}
/* Install mappings */
for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
pte_t pte;
if (pfn > max_pfn_mapped)
max_pfn_mapped = pfn;
if (!pte_none(pte_page[pteidx]))
continue;
pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
pte_page[pteidx] = pte;
}
}
for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
set_page_prot(pmd, PAGE_KERNEL_RO);
}
#endif
void __init xen_setup_machphys_mapping(void)
{
struct xen_machphys_mapping mapping;
if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
machine_to_phys_mapping = (unsigned long *)mapping.v_start;
machine_to_phys_nr = mapping.max_mfn + 1;
} else {
machine_to_phys_nr = MACH2PHYS_NR_ENTRIES;
}
#ifdef CONFIG_X86_32
WARN_ON((machine_to_phys_mapping + (machine_to_phys_nr - 1))
< machine_to_phys_mapping);
#endif
}
#ifdef CONFIG_X86_64
static void __init convert_pfn_mfn(void *v)
{
pte_t *pte = v;
int i;
/* All levels are converted the same way, so just treat them
as ptes. */
for (i = 0; i < PTRS_PER_PTE; i++)
pte[i] = xen_make_pte(pte[i].pte);
}
static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
unsigned long addr)
{
if (*pt_base == PFN_DOWN(__pa(addr))) {
set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
clear_page((void *)addr);
(*pt_base)++;
}
if (*pt_end == PFN_DOWN(__pa(addr))) {
set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
clear_page((void *)addr);
(*pt_end)--;
}
}
/*
* Set up the initial kernel pagetable.
*
* We can construct this by grafting the Xen provided pagetable into
* head_64.S's preconstructed pagetables. We copy the Xen L2's into
* level2_ident_pgt, and level2_kernel_pgt. This means that only the
* kernel has a physical mapping to start with - but that's enough to
* get __va working. We need to fill in the rest of the physical
* mapping once some sort of allocator has been set up.
*/
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
pud_t *l3;
pmd_t *l2;
unsigned long addr[3];
unsigned long pt_base, pt_end;
unsigned i;
/* max_pfn_mapped is the last pfn mapped in the initial memory
* mappings. Considering that on Xen after the kernel mappings we
* have the mappings of some pages that don't exist in pfn space, we
* set max_pfn_mapped to the last real pfn mapped. */
if (xen_start_info->mfn_list < __START_KERNEL_map)
max_pfn_mapped = xen_start_info->first_p2m_pfn;
else
max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
pt_base = PFN_DOWN(__pa(xen_start_info->pt_base));
pt_end = pt_base + xen_start_info->nr_pt_frames;
/* Zap identity mapping */
init_level4_pgt[0] = __pgd(0);
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/* Pre-constructed entries are in pfn, so convert to mfn */
/* L4[272] -> level3_ident_pgt
* L4[511] -> level3_kernel_pgt */
convert_pfn_mfn(init_level4_pgt);
/* L3_i[0] -> level2_ident_pgt */
convert_pfn_mfn(level3_ident_pgt);
/* L3_k[510] -> level2_kernel_pgt
* L3_k[511] -> level2_fixmap_pgt */
convert_pfn_mfn(level3_kernel_pgt);
/* L3_k[511][506] -> level1_fixmap_pgt */
convert_pfn_mfn(level2_fixmap_pgt);
}
/* We get [511][511] and have Xen's version of level2_kernel_pgt */
l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
addr[0] = (unsigned long)pgd;
addr[1] = (unsigned long)l3;
addr[2] = (unsigned long)l2;
/* Graft it onto L4[272][0]. Note that we creating an aliasing problem:
* Both L4[272][0] and L4[511][510] have entries that point to the same
* L2 (PMD) tables. Meaning that if you modify it in __va space
* it will be also modified in the __ka space! (But if you just
* modify the PMD table to point to other PTE's or none, then you
* are OK - which is what cleanup_highmap does) */
copy_page(level2_ident_pgt, l2);
/* Graft it onto L4[511][510] */
copy_page(level2_kernel_pgt, l2);
/* Copy the initial P->M table mappings if necessary. */
i = pgd_index(xen_start_info->mfn_list);
if (i && i < pgd_index(__START_KERNEL_map))
init_level4_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/* Make pagetable pieces RO */
set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
set_page_prot(level2_ident_pgt, PAGE_KERNEL_RO);
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
set_page_prot(level1_fixmap_pgt, PAGE_KERNEL_RO);
/* Pin down new L4 */
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
PFN_DOWN(__pa_symbol(init_level4_pgt)));
/* Unpin Xen-provided one */
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
/*
* At this stage there can be no user pgd, and no page
* structure to attach it to, so make sure we just set kernel
* pgd.
*/
xen_mc_batch();
__xen_write_cr3(true, __pa(init_level4_pgt));
xen_mc_issue(PARAVIRT_LAZY_CPU);
} else
native_write_cr3(__pa(init_level4_pgt));
/* We can't that easily rip out L3 and L2, as the Xen pagetables are
* set out this way: [L4], [L1], [L2], [L3], [L1], [L1] ... for
* the initial domain. For guests using the toolstack, they are in:
* [L4], [L3], [L2], [L1], [L1], order .. So for dom0 we can only
* rip out the [L4] (pgd), but for guests we shave off three pages.
*/
for (i = 0; i < ARRAY_SIZE(addr); i++)
check_pt_base(&pt_base, &pt_end, addr[i]);
/* Our (by three pages) smaller Xen pagetable that we are using */
xen_pt_base = PFN_PHYS(pt_base);
xen_pt_size = (pt_end - pt_base) * PAGE_SIZE;
memblock_reserve(xen_pt_base, xen_pt_size);
/* Revector the xen_start_info */
xen_start_info = (struct start_info *)__va(__pa(xen_start_info));
}
/*
* Read a value from a physical address.
*/
static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
{
unsigned long *vaddr;
unsigned long val;
vaddr = early_memremap_ro(addr, sizeof(val));
val = *vaddr;
early_memunmap(vaddr, sizeof(val));
return val;
}
/*
* Translate a virtual address to a physical one without relying on mapped
* page tables.
*/
static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
{
phys_addr_t pa;
pgd_t pgd;
pud_t pud;
pmd_t pmd;
pte_t pte;
pa = read_cr3();
pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
sizeof(pgd)));
if (!pgd_present(pgd))
return 0;
pa = pgd_val(pgd) & PTE_PFN_MASK;
pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
sizeof(pud)));
if (!pud_present(pud))
return 0;
pa = pud_pfn(pud) << PAGE_SHIFT;
if (pud_large(pud))
return pa + (vaddr & ~PUD_MASK);
pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
sizeof(pmd)));
if (!pmd_present(pmd))
return 0;
pa = pmd_pfn(pmd) << PAGE_SHIFT;
if (pmd_large(pmd))
return pa + (vaddr & ~PMD_MASK);
pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
sizeof(pte)));
if (!pte_present(pte))
return 0;
pa = pte_pfn(pte) << PAGE_SHIFT;
return pa | (vaddr & ~PAGE_MASK);
}
/*
* Find a new area for the hypervisor supplied p2m list and relocate the p2m to
* this area.
*/
void __init xen_relocate_p2m(void)
{
phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys, p4d_phys;
unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
int n_pte, n_pt, n_pmd, n_pud, n_p4d, idx_pte, idx_pt, idx_pmd, idx_pud, idx_p4d;
pte_t *pt;
pmd_t *pmd;
pud_t *pud;
p4d_t *p4d = NULL;
pgd_t *pgd;
unsigned long *new_p2m;
int save_pud;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
n_pud = roundup(size, P4D_SIZE) >> P4D_SHIFT;
if (PTRS_PER_P4D > 1)
n_p4d = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
else
n_p4d = 0;
n_frames = n_pte + n_pt + n_pmd + n_pud + n_p4d;
new_area = xen_find_free_area(PFN_PHYS(n_frames));
if (!new_area) {
xen_raw_console_write("Can't find new memory area for p2m needed due to E820 map conflict\n");
BUG();
}
/*
* Setup the page tables for addressing the new p2m list.
* We have asked the hypervisor to map the p2m list at the user address
* PUD_SIZE. It may have done so, or it may have used a kernel space
* address depending on the Xen version.
* To avoid any possible virtual address collision, just use
* 2 * PUD_SIZE for the new area.
*/
p4d_phys = new_area;
pud_phys = p4d_phys + PFN_PHYS(n_p4d);
pmd_phys = pud_phys + PFN_PHYS(n_pud);
pt_phys = pmd_phys + PFN_PHYS(n_pmd);
p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
pgd = __va(read_cr3());
new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
idx_p4d = 0;
save_pud = n_pud;
do {
if (n_p4d > 0) {
p4d = early_memremap(p4d_phys, PAGE_SIZE);
clear_page(p4d);
n_pud = min(save_pud, PTRS_PER_P4D);
}
for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
pud = early_memremap(pud_phys, PAGE_SIZE);
clear_page(pud);
for (idx_pmd = 0; idx_pmd < min(n_pmd, PTRS_PER_PUD);
idx_pmd++) {
pmd = early_memremap(pmd_phys, PAGE_SIZE);
clear_page(pmd);
for (idx_pt = 0; idx_pt < min(n_pt, PTRS_PER_PMD);
idx_pt++) {
pt = early_memremap(pt_phys, PAGE_SIZE);
clear_page(pt);
for (idx_pte = 0;
idx_pte < min(n_pte, PTRS_PER_PTE);
idx_pte++) {
set_pte(pt + idx_pte,
pfn_pte(p2m_pfn, PAGE_KERNEL));
p2m_pfn++;
}
n_pte -= PTRS_PER_PTE;
early_memunmap(pt, PAGE_SIZE);
make_lowmem_page_readonly(__va(pt_phys));
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
PFN_DOWN(pt_phys));
set_pmd(pmd + idx_pt,
__pmd(_PAGE_TABLE | pt_phys));
pt_phys += PAGE_SIZE;
}
n_pt -= PTRS_PER_PMD;
early_memunmap(pmd, PAGE_SIZE);
make_lowmem_page_readonly(__va(pmd_phys));
pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
PFN_DOWN(pmd_phys));
set_pud(pud + idx_pmd, __pud(_PAGE_TABLE | pmd_phys));
pmd_phys += PAGE_SIZE;
}
n_pmd -= PTRS_PER_PUD;
early_memunmap(pud, PAGE_SIZE);
make_lowmem_page_readonly(__va(pud_phys));
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
if (n_p4d > 0)
set_p4d(p4d + idx_pud, __p4d(_PAGE_TABLE | pud_phys));
else
set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
pud_phys += PAGE_SIZE;
}
if (n_p4d > 0) {
save_pud -= PTRS_PER_P4D;
early_memunmap(p4d, PAGE_SIZE);
make_lowmem_page_readonly(__va(p4d_phys));
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE, PFN_DOWN(p4d_phys));
set_pgd(pgd + 2 + idx_p4d, __pgd(_PAGE_TABLE | p4d_phys));
p4d_phys += PAGE_SIZE;
}
} while (++idx_p4d < n_p4d);
/* Now copy the old p2m info to the new area. */
memcpy(new_p2m, xen_p2m_addr, size);
xen_p2m_addr = new_p2m;
/* Release the old p2m list and set new list info. */
p2m_pfn = PFN_DOWN(xen_early_virt_to_phys(xen_start_info->mfn_list));
BUG_ON(!p2m_pfn);
p2m_pfn_end = p2m_pfn + PFN_DOWN(size);
if (xen_start_info->mfn_list < __START_KERNEL_map) {
pfn = xen_start_info->first_p2m_pfn;
pfn_end = xen_start_info->first_p2m_pfn +
xen_start_info->nr_p2m_frames;
set_pgd(pgd + 1, __pgd(0));
} else {
pfn = p2m_pfn;
pfn_end = p2m_pfn_end;
}
memblock_free(PFN_PHYS(pfn), PAGE_SIZE * (pfn_end - pfn));
while (pfn < pfn_end) {
if (pfn == p2m_pfn) {
pfn = p2m_pfn_end;
continue;
}
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
pfn++;
}
xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
xen_start_info->first_p2m_pfn = PFN_DOWN(new_area);
xen_start_info->nr_p2m_frames = n_frames;
}
#else /* !CONFIG_X86_64 */
static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
static void __init xen_write_cr3_init(unsigned long cr3)
{
unsigned long pfn = PFN_DOWN(__pa(swapper_pg_dir));
BUG_ON(read_cr3() != __pa(initial_page_table));
BUG_ON(cr3 != __pa(swapper_pg_dir));
/*
* We are switching to swapper_pg_dir for the first time (from
* initial_page_table) and therefore need to mark that page
* read-only and then pin it.
*
* Xen disallows sharing of kernel PMDs for PAE
* guests. Therefore we must copy the kernel PMD from
* initial_page_table into a new kernel PMD to be used in
* swapper_pg_dir.
*/
swapper_kernel_pmd =
extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
copy_page(swapper_kernel_pmd, initial_kernel_pmd);
swapper_pg_dir[KERNEL_PGD_BOUNDARY] =
__pgd(__pa(swapper_kernel_pmd) | _PAGE_PRESENT);
set_page_prot(swapper_kernel_pmd, PAGE_KERNEL_RO);
set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
xen_write_cr3(cr3);
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, pfn);
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
PFN_DOWN(__pa(initial_page_table)));
set_page_prot(initial_page_table, PAGE_KERNEL);
set_page_prot(initial_kernel_pmd, PAGE_KERNEL);
pv_mmu_ops.write_cr3 = &xen_write_cr3;
}
/*
* For 32 bit domains xen_start_info->pt_base is the pgd address which might be
* not the first page table in the page table pool.
* Iterate through the initial page tables to find the real page table base.
*/
static phys_addr_t xen_find_pt_base(pmd_t *pmd)
{
phys_addr_t pt_base, paddr;
unsigned pmdidx;
pt_base = min(__pa(xen_start_info->pt_base), __pa(pmd));
for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++)
if (pmd_present(pmd[pmdidx]) && !pmd_large(pmd[pmdidx])) {
paddr = m2p(pmd[pmdidx].pmd);
pt_base = min(pt_base, paddr);
}
return pt_base;
}
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
pmd_t *kernel_pmd;
kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
xen_pt_base = xen_find_pt_base(kernel_pmd);
xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
initial_kernel_pmd =
extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
max_pfn_mapped = PFN_DOWN(xen_pt_base + xen_pt_size + 512 * 1024);
copy_page(initial_kernel_pmd, kernel_pmd);
xen_map_identity_early(initial_kernel_pmd, max_pfn);
copy_page(initial_page_table, pgd);
initial_page_table[KERNEL_PGD_BOUNDARY] =
__pgd(__pa(initial_kernel_pmd) | _PAGE_PRESENT);
set_page_prot(initial_kernel_pmd, PAGE_KERNEL_RO);
set_page_prot(initial_page_table, PAGE_KERNEL_RO);
set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
PFN_DOWN(__pa(initial_page_table)));
xen_write_cr3(__pa(initial_page_table));
memblock_reserve(xen_pt_base, xen_pt_size);
}
#endif /* CONFIG_X86_64 */
void __init xen_reserve_special_pages(void)
{
phys_addr_t paddr;
memblock_reserve(__pa(xen_start_info), PAGE_SIZE);
if (xen_start_info->store_mfn) {
paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->store_mfn));
memblock_reserve(paddr, PAGE_SIZE);
}
if (!xen_initial_domain()) {
paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->console.domU.mfn));
memblock_reserve(paddr, PAGE_SIZE);
}
}
void __init xen_pt_check_e820(void)
{
if (xen_is_e820_reserved(xen_pt_base, xen_pt_size)) {
xen_raw_console_write("Xen hypervisor allocated page table memory conflicts with E820 map\n");
BUG();
}
}
static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
{
pte_t pte;
phys >>= PAGE_SHIFT;
switch (idx) {
case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
case FIX_RO_IDT:
#ifdef CONFIG_X86_32
case FIX_WP_TEST:
# ifdef CONFIG_HIGHMEM
case FIX_KMAP_BEGIN ... FIX_KMAP_END:
# endif
#elif defined(CONFIG_X86_VSYSCALL_EMULATION)
case VSYSCALL_PAGE:
#endif
case FIX_TEXT_POKE0:
case FIX_TEXT_POKE1:
case FIX_GDT_REMAP_BEGIN ... FIX_GDT_REMAP_END:
/* All local page mappings */
pte = pfn_pte(phys, prot);
break;
#ifdef CONFIG_X86_LOCAL_APIC
case FIX_APIC_BASE: /* maps dummy local APIC */
pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
break;
#endif
#ifdef CONFIG_X86_IO_APIC
case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END:
/*
* We just don't map the IO APIC - all access is via
* hypercalls. Keep the address in the pte for reference.
*/
pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
break;
#endif
case FIX_PARAVIRT_BOOTMAP:
/* This is an MFN, but it isn't an IO mapping from the
IO domain */
pte = mfn_pte(phys, prot);
break;
default:
/* By default, set_fixmap is used for hardware mappings */
pte = mfn_pte(phys, prot);
break;
}
__native_set_fixmap(idx, pte);
#ifdef CONFIG_X86_VSYSCALL_EMULATION
/* Replicate changes to map the vsyscall page into the user
pagetable vsyscall mapping. */
if (idx == VSYSCALL_PAGE) {
unsigned long vaddr = __fix_to_virt(idx);
set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
}
#endif
}
static void __init xen_post_allocator_init(void)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
pv_mmu_ops.set_pte = xen_set_pte;
pv_mmu_ops.set_pmd = xen_set_pmd;
pv_mmu_ops.set_pud = xen_set_pud;
#if CONFIG_PGTABLE_LEVELS >= 4
pv_mmu_ops.set_p4d = xen_set_p4d;
#endif
/* This will work as long as patching hasn't happened yet
(which it hasn't) */
pv_mmu_ops.alloc_pte = xen_alloc_pte;
pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
pv_mmu_ops.release_pte = xen_release_pte;
pv_mmu_ops.release_pmd = xen_release_pmd;
#if CONFIG_PGTABLE_LEVELS >= 4
pv_mmu_ops.alloc_pud = xen_alloc_pud;
pv_mmu_ops.release_pud = xen_release_pud;
#endif
pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte);
#ifdef CONFIG_X86_64
pv_mmu_ops.write_cr3 = &xen_write_cr3;
SetPagePinned(virt_to_page(level3_user_vsyscall));
#endif
xen_mark_init_mm_pinned();
}
static void xen_leave_lazy_mmu(void)
{
preempt_disable();
xen_mc_flush();
paravirt_leave_lazy_mmu();
preempt_enable();
}
static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.read_cr2 = xen_read_cr2,
.write_cr2 = xen_write_cr2,
.read_cr3 = xen_read_cr3,
.write_cr3 = xen_write_cr3_init,
.flush_tlb_user = xen_flush_tlb,
.flush_tlb_kernel = xen_flush_tlb,
.flush_tlb_single = xen_flush_tlb_single,
.flush_tlb_others = xen_flush_tlb_others,
.pte_update = paravirt_nop,
.pgd_alloc = xen_pgd_alloc,
.pgd_free = xen_pgd_free,
.alloc_pte = xen_alloc_pte_init,
.release_pte = xen_release_pte_init,
.alloc_pmd = xen_alloc_pmd_init,
.release_pmd = xen_release_pmd_init,
.set_pte = xen_set_pte_init,
.set_pte_at = xen_set_pte_at,
.set_pmd = xen_set_pmd_hyper,
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
.pte_val = PV_CALLEE_SAVE(xen_pte_val),
.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
.make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
.make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
#ifdef CONFIG_X86_PAE
.set_pte_atomic = xen_set_pte_atomic,
.pte_clear = xen_pte_clear,
.pmd_clear = xen_pmd_clear,
#endif /* CONFIG_X86_PAE */
.set_pud = xen_set_pud_hyper,
.make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
.pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
#if CONFIG_PGTABLE_LEVELS >= 4
.pud_val = PV_CALLEE_SAVE(xen_pud_val),
.make_pud = PV_CALLEE_SAVE(xen_make_pud),
.set_p4d = xen_set_p4d_hyper,
.alloc_pud = xen_alloc_pmd_init,
.release_pud = xen_release_pmd_init,
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
.activate_mm = xen_activate_mm,
.dup_mmap = xen_dup_mmap,
.exit_mmap = xen_exit_mmap,
.lazy_mode = {
.enter = paravirt_enter_lazy_mmu,
.leave = xen_leave_lazy_mmu,
.flush = paravirt_flush_lazy_mmu,
},
.set_fixmap = xen_set_fixmap,
};
void __init xen_init_mmu_ops(void)
{
x86_init.paging.pagetable_init = xen_pagetable_init;
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
pv_mmu_ops = xen_mmu_ops;
memset(dummy_mapping, 0xff, PAGE_SIZE);
}
/* Protected by xen_reservation_lock. */
#define MAX_CONTIG_ORDER 9 /* 2MB */
static unsigned long discontig_frames[1<<MAX_CONTIG_ORDER];
#define VOID_PTE (mfn_pte(0, __pgprot(0)))
static void xen_zap_pfn_range(unsigned long vaddr, unsigned int order,
unsigned long *in_frames,
unsigned long *out_frames)
{
int i;
struct multicall_space mcs;
xen_mc_batch();
for (i = 0; i < (1UL<<order); i++, vaddr += PAGE_SIZE) {
mcs = __xen_mc_entry(0);
if (in_frames)
in_frames[i] = virt_to_mfn(vaddr);
MULTI_update_va_mapping(mcs.mc, vaddr, VOID_PTE, 0);
__set_phys_to_machine(virt_to_pfn(vaddr), INVALID_P2M_ENTRY);
if (out_frames)
out_frames[i] = virt_to_pfn(vaddr);
}
xen_mc_issue(0);
}
/*
* Update the pfn-to-mfn mappings for a virtual address range, either to
* point to an array of mfns, or contiguously from a single starting
* mfn.
*/
static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
unsigned long *mfns,
unsigned long first_mfn)
{
unsigned i, limit;
unsigned long mfn;
xen_mc_batch();
limit = 1u << order;
for (i = 0; i < limit; i++, vaddr += PAGE_SIZE) {
struct multicall_space mcs;
unsigned flags;
mcs = __xen_mc_entry(0);
if (mfns)
mfn = mfns[i];
else
mfn = first_mfn + i;
if (i < (limit - 1))
flags = 0;
else {
if (order == 0)
flags = UVMF_INVLPG | UVMF_ALL;
else
flags = UVMF_TLB_FLUSH | UVMF_ALL;
}
MULTI_update_va_mapping(mcs.mc, vaddr,
mfn_pte(mfn, PAGE_KERNEL), flags);
set_phys_to_machine(virt_to_pfn(vaddr), mfn);
}
xen_mc_issue(0);
}
/*
* Perform the hypercall to exchange a region of our pfns to point to
* memory with the required contiguous alignment. Takes the pfns as
* input, and populates mfns as output.
*
* Returns a success code indicating whether the hypervisor was able to
* satisfy the request or not.
*/
static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
unsigned long *pfns_in,
unsigned long extents_out,
unsigned int order_out,
unsigned long *mfns_out,
unsigned int address_bits)
{
long rc;
int success;
struct xen_memory_exchange exchange = {
.in = {
.nr_extents = extents_in,
.extent_order = order_in,
.extent_start = pfns_in,
.domid = DOMID_SELF
},
.out = {
.nr_extents = extents_out,
.extent_order = order_out,
.extent_start = mfns_out,
.address_bits = address_bits,
.domid = DOMID_SELF
}
};
BUG_ON(extents_in << order_in != extents_out << order_out);
rc = HYPERVISOR_memory_op(XENMEM_exchange, &exchange);
success = (exchange.nr_exchanged == extents_in);
BUG_ON(!success && ((exchange.nr_exchanged != 0) || (rc == 0)));
BUG_ON(success && (rc != 0));
return success;
}
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
unsigned long *in_frames = discontig_frames, out_frame;
unsigned long flags;
int success;
unsigned long vstart = (unsigned long)phys_to_virt(pstart);
/*
* Currently an auto-translated guest will not perform I/O, nor will
* it require PAE page directories below 4GB. Therefore any calls to
* this function are redundant and can be ignored.
*/
if (xen_feature(XENFEAT_auto_translated_physmap))
return 0;
if (unlikely(order > MAX_CONTIG_ORDER))
return -ENOMEM;
memset((void *) vstart, 0, PAGE_SIZE << order);
spin_lock_irqsave(&xen_reservation_lock, flags);
/* 1. Zap current PTEs, remembering MFNs. */
xen_zap_pfn_range(vstart, order, in_frames, NULL);
/* 2. Get a new contiguous memory extent. */
out_frame = virt_to_pfn(vstart);
success = xen_exchange_memory(1UL << order, 0, in_frames,
1, order, &out_frame,
address_bits);
/* 3. Map the new extent in place of old pages. */
if (success)
xen_remap_exchanged_ptes(vstart, order, NULL, out_frame);
else
xen_remap_exchanged_ptes(vstart, order, in_frames, 0);
spin_unlock_irqrestore(&xen_reservation_lock, flags);
*dma_handle = virt_to_machine(vstart).maddr;
return success ? 0 : -ENOMEM;
}
EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
{
unsigned long *out_frames = discontig_frames, in_frame;
unsigned long flags;
int success;
unsigned long vstart;
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
if (unlikely(order > MAX_CONTIG_ORDER))
return;
vstart = (unsigned long)phys_to_virt(pstart);
memset((void *) vstart, 0, PAGE_SIZE << order);
spin_lock_irqsave(&xen_reservation_lock, flags);
/* 1. Find start MFN of contiguous extent. */
in_frame = virt_to_mfn(vstart);
/* 2. Zap current PTEs. */
xen_zap_pfn_range(vstart, order, NULL, out_frames);
/* 3. Do the exchange for non-contiguous MFNs. */
success = xen_exchange_memory(1, order, &in_frame, 1UL << order,
0, out_frames, 0);
/* 4. Map new pages in place of old pages. */
if (success)
xen_remap_exchanged_ptes(vstart, order, out_frames, 0);
else
xen_remap_exchanged_ptes(vstart, order, NULL, in_frame);
spin_unlock_irqrestore(&xen_reservation_lock, flags);
}
EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
#ifdef CONFIG_KEXEC_CORE
phys_addr_t paddr_vmcoreinfo_note(void)
{
if (xen_pv_domain())
return virt_to_machine(&vmcoreinfo_note).maddr;
else
return __pa_symbol(&vmcoreinfo_note);
}
#endif /* CONFIG_KEXEC_CORE */
arch/x86/xen/pmu.h
View file @ a9648072
......@@ -4,8 +4,13 @@
#include <xen/interface/xenpmu.h>
irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id);
#ifdef CONFIG_XEN_HAVE_VPMU
void xen_pmu_init(int cpu);
void xen_pmu_finish(int cpu);
#else
static inline void xen_pmu_init(int cpu) {}
static inline void xen_pmu_finish(int cpu) {}
#endif
bool is_xen_pmu(int cpu);
bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err);
bool pmu_msr_write(unsigned int msr, uint32_t low, uint32_t high, int *err);
......
arch/x86/xen/smp.c
View file @ a9648072
/*
* Xen SMP support
*
* This file implements the Xen versions of smp_ops. SMP under Xen is
* very straightforward. Bringing a CPU up is simply a matter of
* loading its initial context and setting it running.
*
* IPIs are handled through the Xen event mechanism.
*
* Because virtual CPUs can be scheduled onto any real CPU, there's no
* useful topology information for the kernel to make use of. As a
* result, all CPUs are treated as if they're single-core and
* single-threaded.
*/
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/irq_work.h>
#include <linux/tick.h>
#include <linux/nmi.h>
#include <asm/paravirt.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cpu.h>
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/xenpmu.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>
#include <xen/hvc-console.h>
#include "xen-ops.h"
#include "mmu.h"
#include "smp.h"
#include "pmu.h"
cpumask_var_t xen_cpu_initialized_map;
struct xen_common_irq {
int irq;
char *name;
};
static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
/*
* Reschedule call back.
......@@ -70,42 +28,6 @@ static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static void cpu_bringup(void)
{
int cpu;
cpu_init();
touch_softlockup_watchdog();
preempt_disable();
/* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
xen_enable_sysenter();
xen_enable_syscall();
}
cpu = smp_processor_id();
smp_store_cpu_info(cpu);
cpu_data(cpu).x86_max_cores = 1;
set_cpu_sibling_map(cpu);
xen_setup_cpu_clockevents();
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);
cpu_set_state_online(cpu); /* Implies full memory barrier. */
/* We can take interrupts now: we're officially "up". */
local_irq_enable();
}
asmlinkage __visible void cpu_bringup_and_idle(void)
{
cpu_bringup();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
void xen_smp_intr_free(unsigned int cpu)
{
if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
......@@ -133,27 +55,12 @@ void xen_smp_intr_free(unsigned int cpu)
kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
}
if (xen_hvm_domain())
return;
if (per_cpu(xen_irq_work, cpu).irq >= 0) {
unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
per_cpu(xen_irq_work, cpu).irq = -1;
kfree(per_cpu(xen_irq_work, cpu).name);
per_cpu(xen_irq_work, cpu).name = NULL;
}
}
if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
per_cpu(xen_pmu_irq, cpu).irq = -1;
kfree(per_cpu(xen_pmu_irq, cpu).name);
per_cpu(xen_pmu_irq, cpu).name = NULL;
}
};
int xen_smp_intr_init(unsigned int cpu)
{
int rc;
char *resched_name, *callfunc_name, *debug_name, *pmu_name;
char *resched_name, *callfunc_name, *debug_name;
resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
......@@ -200,37 +107,6 @@ int xen_smp_intr_init(unsigned int cpu)
per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
/*
* The IRQ worker on PVHVM goes through the native path and uses the
* IPI mechanism.
*/
if (xen_hvm_domain())
return 0;
callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
cpu,
xen_irq_work_interrupt,
IRQF_PERCPU|IRQF_NOBALANCING,
callfunc_name,
NULL);
if (rc < 0)
goto fail;
per_cpu(xen_irq_work, cpu).irq = rc;
per_cpu(xen_irq_work, cpu).name = callfunc_name;
if (is_xen_pmu(cpu)) {
pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
xen_pmu_irq_handler,
IRQF_PERCPU|IRQF_NOBALANCING,
pmu_name, NULL);
if (rc < 0)
goto fail;
per_cpu(xen_pmu_irq, cpu).irq = rc;
per_cpu(xen_pmu_irq, cpu).name = pmu_name;
}
return 0;
fail:
......@@ -238,333 +114,7 @@ int xen_smp_intr_init(unsigned int cpu)
return rc;
}
static void __init xen_fill_possible_map(void)
{
int i, rc;
if (xen_initial_domain())
return;
for (i = 0; i < nr_cpu_ids; i++) {
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
if (rc >= 0) {
num_processors++;
set_cpu_possible(i, true);
}
}
}
static void __init xen_filter_cpu_maps(void)
{
int i, rc;
unsigned int subtract = 0;
if (!xen_initial_domain())
return;
num_processors = 0;
disabled_cpus = 0;
for (i = 0; i < nr_cpu_ids; i++) {
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
if (rc >= 0) {
num_processors++;
set_cpu_possible(i, true);
} else {
set_cpu_possible(i, false);
set_cpu_present(i, false);
subtract++;
}
}
#ifdef CONFIG_HOTPLUG_CPU
/* This is akin to using 'nr_cpus' on the Linux command line.
* Which is OK as when we use 'dom0_max_vcpus=X' we can only
* have up to X, while nr_cpu_ids is greater than X. This
* normally is not a problem, except when CPU hotplugging
* is involved and then there might be more than X CPUs
* in the guest - which will not work as there is no
* hypercall to expand the max number of VCPUs an already
* running guest has. So cap it up to X. */
if (subtract)
nr_cpu_ids = nr_cpu_ids - subtract;
#endif
}
static void __init xen_smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != 0);
native_smp_prepare_boot_cpu();
if (xen_pv_domain()) {
if (!xen_feature(XENFEAT_writable_page_tables))
/* We've switched to the "real" per-cpu gdt, so make
* sure the old memory can be recycled. */
make_lowmem_page_readwrite(xen_initial_gdt);
#ifdef CONFIG_X86_32
/*
* Xen starts us with XEN_FLAT_RING1_DS, but linux code
* expects __USER_DS
*/
loadsegment(ds, __USER_DS);
loadsegment(es, __USER_DS);
#endif
xen_filter_cpu_maps();
xen_setup_vcpu_info_placement();
}
/*
* Setup vcpu_info for boot CPU.
*/
if (xen_hvm_domain())
xen_vcpu_setup(0);
/*
* The alternative logic (which patches the unlock/lock) runs before
* the smp bootup up code is activated. Hence we need to set this up
* the core kernel is being patched. Otherwise we will have only
* modules patched but not core code.
*/
xen_init_spinlocks();
}
static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
{
unsigned cpu;
unsigned int i;
if (skip_ioapic_setup) {
char *m = (max_cpus == 0) ?
"The nosmp parameter is incompatible with Xen; " \
"use Xen dom0_max_vcpus=1 parameter" :
"The noapic parameter is incompatible with Xen";
xen_raw_printk(m);
panic(m);
}
xen_init_lock_cpu(0);
smp_store_boot_cpu_info();
cpu_data(0).x86_max_cores = 1;
for_each_possible_cpu(i) {
zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}
set_cpu_sibling_map(0);
xen_pmu_init(0);
if (xen_smp_intr_init(0))
BUG();
if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
panic("could not allocate xen_cpu_initialized_map\n");
cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
/* Restrict the possible_map according to max_cpus. */
while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
continue;
set_cpu_possible(cpu, false);
}
for_each_possible_cpu(cpu)
set_cpu_present(cpu, true);
}
static int
cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
{
struct vcpu_guest_context *ctxt;
struct desc_struct *gdt;
unsigned long gdt_mfn;
/* used to tell cpu_init() that it can proceed with initialization */
cpumask_set_cpu(cpu, cpu_callout_mask);
if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
return 0;
ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
if (ctxt == NULL)
return -ENOMEM;
gdt = get_cpu_gdt_rw(cpu);
#ifdef CONFIG_X86_32
ctxt->user_regs.fs = __KERNEL_PERCPU;
ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
#endif
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
ctxt->flags = VGCF_IN_KERNEL;
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
ctxt->user_regs.ds = __USER_DS;
ctxt->user_regs.es = __USER_DS;
ctxt->user_regs.ss = __KERNEL_DS;
xen_copy_trap_info(ctxt->trap_ctxt);
ctxt->ldt_ents = 0;
BUG_ON((unsigned long)gdt & ~PAGE_MASK);
gdt_mfn = arbitrary_virt_to_mfn(gdt);
make_lowmem_page_readonly(gdt);
make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
ctxt->gdt_frames[0] = gdt_mfn;
ctxt->gdt_ents = GDT_ENTRIES;
ctxt->kernel_ss = __KERNEL_DS;
ctxt->kernel_sp = idle->thread.sp0;
#ifdef CONFIG_X86_32
ctxt->event_callback_cs = __KERNEL_CS;
ctxt->failsafe_callback_cs = __KERNEL_CS;
#else
ctxt->gs_base_kernel = per_cpu_offset(cpu);
#endif
ctxt->event_callback_eip =
(unsigned long)xen_hypervisor_callback;
ctxt->failsafe_callback_eip =
(unsigned long)xen_failsafe_callback;
ctxt->user_regs.cs = __KERNEL_CS;
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
BUG();
kfree(ctxt);
return 0;
}
static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
{
int rc;
common_cpu_up(cpu, idle);
xen_setup_runstate_info(cpu);
/*
* PV VCPUs are always successfully taken down (see 'while' loop
* in xen_cpu_die()), so -EBUSY is an error.
*/
rc = cpu_check_up_prepare(cpu);
if (rc)
return rc;
/* make sure interrupts start blocked */
per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
rc = cpu_initialize_context(cpu, idle);
if (rc)
return rc;
xen_pmu_init(cpu);
rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
BUG_ON(rc);
while (cpu_report_state(cpu) != CPU_ONLINE)
HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
return 0;
}
static void xen_smp_cpus_done(unsigned int max_cpus)
{
}
#ifdef CONFIG_HOTPLUG_CPU
static int xen_cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
if (cpu == 0)
return -EBUSY;
cpu_disable_common();
load_cr3(swapper_pg_dir);
return 0;
}
static void xen_cpu_die(unsigned int cpu)
{
while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up,
xen_vcpu_nr(cpu), NULL)) {
__set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/10);
}
if (common_cpu_die(cpu) == 0) {
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
xen_teardown_timer(cpu);
xen_pmu_finish(cpu);
}
}
static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
{
play_dead_common();
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
cpu_bringup();
/*
* commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
* clears certain data that the cpu_idle loop (which called us
* and that we return from) expects. The only way to get that
* data back is to call:
*/
tick_nohz_idle_enter();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
#else /* !CONFIG_HOTPLUG_CPU */
static int xen_cpu_disable(void)
{
return -ENOSYS;
}
static void xen_cpu_die(unsigned int cpu)
{
BUG();
}
static void xen_play_dead(void)
{
BUG();
}
#endif
static void stop_self(void *v)
{
int cpu = smp_processor_id();
/* make sure we're not pinning something down */
load_cr3(swapper_pg_dir);
/* should set up a minimal gdt */
set_cpu_online(cpu, false);
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
BUG();
}
static void xen_stop_other_cpus(int wait)
{
smp_call_function(stop_self, NULL, wait);
}
static void xen_smp_send_reschedule(int cpu)
void xen_smp_send_reschedule(int cpu)
{
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
}
......@@ -578,7 +128,7 @@ static void __xen_send_IPI_mask(const struct cpumask *mask,
xen_send_IPI_one(cpu, vector);
}
static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
void xen_smp_send_call_function_ipi(const struct cpumask *mask)
{
int cpu;
......@@ -593,7 +143,7 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
}
}
static void xen_smp_send_call_function_single_ipi(int cpu)
void xen_smp_send_call_function_single_ipi(int cpu)
{
__xen_send_IPI_mask(cpumask_of(cpu),
XEN_CALL_FUNCTION_SINGLE_VECTOR);
......@@ -698,54 +248,3 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
{
irq_enter();
irq_work_run();
inc_irq_stat(apic_irq_work_irqs);
irq_exit();
return IRQ_HANDLED;
}
static const struct smp_ops xen_smp_ops __initconst = {
.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
.smp_prepare_cpus = xen_smp_prepare_cpus,
.smp_cpus_done = xen_smp_cpus_done,
.cpu_up = xen_cpu_up,
.cpu_die = xen_cpu_die,
.cpu_disable = xen_cpu_disable,
.play_dead = xen_play_dead,
.stop_other_cpus = xen_stop_other_cpus,
.smp_send_reschedule = xen_smp_send_reschedule,
.send_call_func_ipi = xen_smp_send_call_function_ipi,
.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
};
void __init xen_smp_init(void)
{
smp_ops = xen_smp_ops;
xen_fill_possible_map();
}
static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
{
native_smp_prepare_cpus(max_cpus);
WARN_ON(xen_smp_intr_init(0));
xen_init_lock_cpu(0);
}
void __init xen_hvm_smp_init(void)
{
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
smp_ops.cpu_die = xen_cpu_die;
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu;
}
arch/x86/xen/smp.h
View file @ a9648072
......@@ -11,7 +11,17 @@ extern void xen_send_IPI_self(int vector);
extern int xen_smp_intr_init(unsigned int cpu);
extern void xen_smp_intr_free(unsigned int cpu);
int xen_smp_intr_init_pv(unsigned int cpu);
void xen_smp_intr_free_pv(unsigned int cpu);
void xen_smp_send_reschedule(int cpu);
void xen_smp_send_call_function_ipi(const struct cpumask *mask);
void xen_smp_send_call_function_single_ipi(int cpu);
struct xen_common_irq {
int irq;
char *name;
};
#else /* CONFIG_SMP */
static inline int xen_smp_intr_init(unsigned int cpu)
......@@ -19,6 +29,12 @@ static inline int xen_smp_intr_init(unsigned int cpu)
return 0;
}
static inline void xen_smp_intr_free(unsigned int cpu) {}
static inline int xen_smp_intr_init_pv(unsigned int cpu)
{
return 0;
}
static inline void xen_smp_intr_free_pv(unsigned int cpu) {}
#endif /* CONFIG_SMP */
#endif
arch/x86/xen/smp_hvm.c 0 → 100644
View file @ a9648072
#include <asm/smp.h>
#include <xen/events.h>
#include "xen-ops.h"
#include "smp.h"
static void __init xen_hvm_smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != 0);
native_smp_prepare_boot_cpu();
/*
* Setup vcpu_info for boot CPU.
*/
xen_vcpu_setup(0);
/*
* The alternative logic (which patches the unlock/lock) runs before
* the smp bootup up code is activated. Hence we need to set this up
* the core kernel is being patched. Otherwise we will have only
* modules patched but not core code.
*/
xen_init_spinlocks();
}
static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
{
native_smp_prepare_cpus(max_cpus);
WARN_ON(xen_smp_intr_init(0));
xen_init_lock_cpu(0);
}
#ifdef CONFIG_HOTPLUG_CPU
static void xen_hvm_cpu_die(unsigned int cpu)
{
if (common_cpu_die(cpu) == 0) {
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
xen_teardown_timer(cpu);
}
}
#else
static void xen_hvm_cpu_die(unsigned int cpu)
{
BUG();
}
#endif
void __init xen_hvm_smp_init(void)
{
if (!xen_have_vector_callback)
return;
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
smp_ops.cpu_die = xen_hvm_cpu_die;
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
}
arch/x86/xen/smp_pv.c 0 → 100644
View file @ a9648072
/*
* Xen SMP support
*
* This file implements the Xen versions of smp_ops. SMP under Xen is
* very straightforward. Bringing a CPU up is simply a matter of
* loading its initial context and setting it running.
*
* IPIs are handled through the Xen event mechanism.
*
* Because virtual CPUs can be scheduled onto any real CPU, there's no
* useful topology information for the kernel to make use of. As a
* result, all CPUs are treated as if they're single-core and
* single-threaded.
*/
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/irq_work.h>
#include <linux/tick.h>
#include <linux/nmi.h>
#include <asm/paravirt.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cpu.h>
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/xenpmu.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>
#include <xen/hvc-console.h>
#include "xen-ops.h"
#include "mmu.h"
#include "smp.h"
#include "pmu.h"
cpumask_var_t xen_cpu_initialized_map;
static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
static void cpu_bringup(void)
{
int cpu;
cpu_init();
touch_softlockup_watchdog();
preempt_disable();
/* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
xen_enable_sysenter();
xen_enable_syscall();
}
cpu = smp_processor_id();
smp_store_cpu_info(cpu);
cpu_data(cpu).x86_max_cores = 1;
set_cpu_sibling_map(cpu);
xen_setup_cpu_clockevents();
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);
cpu_set_state_online(cpu); /* Implies full memory barrier. */
/* We can take interrupts now: we're officially "up". */
local_irq_enable();
}
asmlinkage __visible void cpu_bringup_and_idle(void)
{
cpu_bringup();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
void xen_smp_intr_free_pv(unsigned int cpu)
{
if (per_cpu(xen_irq_work, cpu).irq >= 0) {
unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
per_cpu(xen_irq_work, cpu).irq = -1;
kfree(per_cpu(xen_irq_work, cpu).name);
per_cpu(xen_irq_work, cpu).name = NULL;
}
if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
per_cpu(xen_pmu_irq, cpu).irq = -1;
kfree(per_cpu(xen_pmu_irq, cpu).name);
per_cpu(xen_pmu_irq, cpu).name = NULL;
}
}
int xen_smp_intr_init_pv(unsigned int cpu)
{
int rc;
char *callfunc_name, *pmu_name;
callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
cpu,
xen_irq_work_interrupt,
IRQF_PERCPU|IRQF_NOBALANCING,
callfunc_name,
NULL);
if (rc < 0)
goto fail;
per_cpu(xen_irq_work, cpu).irq = rc;
per_cpu(xen_irq_work, cpu).name = callfunc_name;
if (is_xen_pmu(cpu)) {
pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
xen_pmu_irq_handler,
IRQF_PERCPU|IRQF_NOBALANCING,
pmu_name, NULL);
if (rc < 0)
goto fail;
per_cpu(xen_pmu_irq, cpu).irq = rc;
per_cpu(xen_pmu_irq, cpu).name = pmu_name;
}
return 0;
fail:
xen_smp_intr_free_pv(cpu);
return rc;
}
static void __init xen_fill_possible_map(void)
{
int i, rc;
if (xen_initial_domain())
return;
for (i = 0; i < nr_cpu_ids; i++) {
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
if (rc >= 0) {
num_processors++;
set_cpu_possible(i, true);
}
}
}
static void __init xen_filter_cpu_maps(void)
{
int i, rc;
unsigned int subtract = 0;
if (!xen_initial_domain())
return;
num_processors = 0;
disabled_cpus = 0;
for (i = 0; i < nr_cpu_ids; i++) {
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
if (rc >= 0) {
num_processors++;
set_cpu_possible(i, true);
} else {
set_cpu_possible(i, false);
set_cpu_present(i, false);
subtract++;
}
}
#ifdef CONFIG_HOTPLUG_CPU
/* This is akin to using 'nr_cpus' on the Linux command line.
* Which is OK as when we use 'dom0_max_vcpus=X' we can only
* have up to X, while nr_cpu_ids is greater than X. This
* normally is not a problem, except when CPU hotplugging
* is involved and then there might be more than X CPUs
* in the guest - which will not work as there is no
* hypercall to expand the max number of VCPUs an already
* running guest has. So cap it up to X. */
if (subtract)
nr_cpu_ids = nr_cpu_ids - subtract;
#endif
}
static void __init xen_pv_smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != 0);
native_smp_prepare_boot_cpu();
if (!xen_feature(XENFEAT_writable_page_tables))
/* We've switched to the "real" per-cpu gdt, so make
* sure the old memory can be recycled. */
make_lowmem_page_readwrite(xen_initial_gdt);
#ifdef CONFIG_X86_32
/*
* Xen starts us with XEN_FLAT_RING1_DS, but linux code
* expects __USER_DS
*/
loadsegment(ds, __USER_DS);
loadsegment(es, __USER_DS);
#endif
xen_filter_cpu_maps();
xen_setup_vcpu_info_placement();
/*
* The alternative logic (which patches the unlock/lock) runs before
* the smp bootup up code is activated. Hence we need to set this up
* the core kernel is being patched. Otherwise we will have only
* modules patched but not core code.
*/
xen_init_spinlocks();
}
static void __init xen_pv_smp_prepare_cpus(unsigned int max_cpus)
{
unsigned cpu;
unsigned int i;
if (skip_ioapic_setup) {
char *m = (max_cpus == 0) ?
"The nosmp parameter is incompatible with Xen; " \
"use Xen dom0_max_vcpus=1 parameter" :
"The noapic parameter is incompatible with Xen";
xen_raw_printk(m);
panic(m);
}
xen_init_lock_cpu(0);
smp_store_boot_cpu_info();
cpu_data(0).x86_max_cores = 1;
for_each_possible_cpu(i) {
zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}
set_cpu_sibling_map(0);
xen_pmu_init(0);
if (xen_smp_intr_init(0) || xen_smp_intr_init_pv(0))
BUG();
if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
panic("could not allocate xen_cpu_initialized_map\n");
cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
/* Restrict the possible_map according to max_cpus. */
while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
continue;
set_cpu_possible(cpu, false);
}
for_each_possible_cpu(cpu)
set_cpu_present(cpu, true);
}
static int
cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
{
struct vcpu_guest_context *ctxt;
struct desc_struct *gdt;
unsigned long gdt_mfn;
/* used to tell cpu_init() that it can proceed with initialization */
cpumask_set_cpu(cpu, cpu_callout_mask);
if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
return 0;
ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
if (ctxt == NULL)
return -ENOMEM;
gdt = get_cpu_gdt_rw(cpu);
#ifdef CONFIG_X86_32
ctxt->user_regs.fs = __KERNEL_PERCPU;
ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
#endif
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
ctxt->flags = VGCF_IN_KERNEL;
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
ctxt->user_regs.ds = __USER_DS;
ctxt->user_regs.es = __USER_DS;
ctxt->user_regs.ss = __KERNEL_DS;
xen_copy_trap_info(ctxt->trap_ctxt);
ctxt->ldt_ents = 0;
BUG_ON((unsigned long)gdt & ~PAGE_MASK);
gdt_mfn = arbitrary_virt_to_mfn(gdt);
make_lowmem_page_readonly(gdt);
make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
ctxt->gdt_frames[0] = gdt_mfn;
ctxt->gdt_ents = GDT_ENTRIES;
ctxt->kernel_ss = __KERNEL_DS;
ctxt->kernel_sp = idle->thread.sp0;
#ifdef CONFIG_X86_32
ctxt->event_callback_cs = __KERNEL_CS;
ctxt->failsafe_callback_cs = __KERNEL_CS;
#else
ctxt->gs_base_kernel = per_cpu_offset(cpu);
#endif
ctxt->event_callback_eip =
(unsigned long)xen_hypervisor_callback;
ctxt->failsafe_callback_eip =
(unsigned long)xen_failsafe_callback;
ctxt->user_regs.cs = __KERNEL_CS;
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
BUG();
kfree(ctxt);
return 0;
}
static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle)
{
int rc;
common_cpu_up(cpu, idle);
xen_setup_runstate_info(cpu);
/*
* PV VCPUs are always successfully taken down (see 'while' loop
* in xen_cpu_die()), so -EBUSY is an error.
*/
rc = cpu_check_up_prepare(cpu);
if (rc)
return rc;
/* make sure interrupts start blocked */
per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
rc = cpu_initialize_context(cpu, idle);
if (rc)
return rc;
xen_pmu_init(cpu);
rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
BUG_ON(rc);
while (cpu_report_state(cpu) != CPU_ONLINE)
HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
return 0;
}
static void xen_pv_smp_cpus_done(unsigned int max_cpus)
{
}
#ifdef CONFIG_HOTPLUG_CPU
static int xen_pv_cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
if (cpu == 0)
return -EBUSY;
cpu_disable_common();
load_cr3(swapper_pg_dir);
return 0;
}
static void xen_pv_cpu_die(unsigned int cpu)
{
while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
xen_vcpu_nr(cpu), NULL)) {
__set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/10);
}
if (common_cpu_die(cpu) == 0) {
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
xen_teardown_timer(cpu);
xen_pmu_finish(cpu);
}
}
static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
{
play_dead_common();
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
cpu_bringup();
/*
* commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
* clears certain data that the cpu_idle loop (which called us
* and that we return from) expects. The only way to get that
* data back is to call:
*/
tick_nohz_idle_enter();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
#else /* !CONFIG_HOTPLUG_CPU */
static int xen_pv_cpu_disable(void)
{
return -ENOSYS;
}
static void xen_pv_cpu_die(unsigned int cpu)
{
BUG();
}
static void xen_pv_play_dead(void)
{
BUG();
}
#endif
static void stop_self(void *v)
{
int cpu = smp_processor_id();
/* make sure we're not pinning something down */
load_cr3(swapper_pg_dir);
/* should set up a minimal gdt */
set_cpu_online(cpu, false);
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
BUG();
}
static void xen_pv_stop_other_cpus(int wait)
{
smp_call_function(stop_self, NULL, wait);
}
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
{
irq_enter();
irq_work_run();
inc_irq_stat(apic_irq_work_irqs);
irq_exit();
return IRQ_HANDLED;
}
static const struct smp_ops xen_smp_ops __initconst = {
.smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
.smp_prepare_cpus = xen_pv_smp_prepare_cpus,
.smp_cpus_done = xen_pv_smp_cpus_done,
.cpu_up = xen_pv_cpu_up,
.cpu_die = xen_pv_cpu_die,
.cpu_disable = xen_pv_cpu_disable,
.play_dead = xen_pv_play_dead,
.stop_other_cpus = xen_pv_stop_other_cpus,
.smp_send_reschedule = xen_smp_send_reschedule,
.send_call_func_ipi = xen_smp_send_call_function_ipi,
.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
};
void __init xen_smp_init(void)
{
smp_ops = xen_smp_ops;
xen_fill_possible_map();
}
arch/x86/xen/suspend.c
View file @ a9648072
......@@ -14,60 +14,6 @@
#include "mmu.h"
#include "pmu.h"
static void xen_pv_pre_suspend(void)
{
xen_mm_pin_all();
xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
xen_start_info->console.domU.mfn =
mfn_to_pfn(xen_start_info->console.domU.mfn);
BUG_ON(!irqs_disabled());
HYPERVISOR_shared_info = &xen_dummy_shared_info;
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
__pte_ma(0), 0))
BUG();
}
static void xen_hvm_post_suspend(int suspend_cancelled)
{
#ifdef CONFIG_XEN_PVHVM
int cpu;
if (!suspend_cancelled)
xen_hvm_init_shared_info();
xen_callback_vector();
xen_unplug_emulated_devices();
if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
for_each_online_cpu(cpu) {
xen_setup_runstate_info(cpu);
}
}
#endif
}
static void xen_pv_post_suspend(int suspend_cancelled)
{
xen_build_mfn_list_list();
xen_setup_shared_info();
if (suspend_cancelled) {
xen_start_info->store_mfn =
pfn_to_mfn(xen_start_info->store_mfn);
xen_start_info->console.domU.mfn =
pfn_to_mfn(xen_start_info->console.domU.mfn);
} else {
#ifdef CONFIG_SMP
BUG_ON(xen_cpu_initialized_map == NULL);
cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
#endif
xen_vcpu_restore();
}
xen_mm_unpin_all();
}
void xen_arch_pre_suspend(void)
{
if (xen_pv_domain())
......
arch/x86/xen/suspend_hvm.c 0 → 100644
View file @ a9648072
#include <linux/types.h>
#include <xen/xen.h>
#include <xen/features.h>
#include <xen/interface/features.h>
#include "xen-ops.h"
void xen_hvm_post_suspend(int suspend_cancelled)
{
int cpu;
if (!suspend_cancelled)
xen_hvm_init_shared_info();
xen_callback_vector();
xen_unplug_emulated_devices();
if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
for_each_online_cpu(cpu) {
xen_setup_runstate_info(cpu);
}
}
}
arch/x86/xen/suspend_pv.c 0 → 100644
View file @ a9648072
#include <linux/types.h>
#include <asm/fixmap.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/page.h>
#include "xen-ops.h"
void xen_pv_pre_suspend(void)
{
xen_mm_pin_all();
xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
xen_start_info->console.domU.mfn =
mfn_to_pfn(xen_start_info->console.domU.mfn);
BUG_ON(!irqs_disabled());
HYPERVISOR_shared_info = &xen_dummy_shared_info;
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
__pte_ma(0), 0))
BUG();
}
void xen_pv_post_suspend(int suspend_cancelled)
{
xen_build_mfn_list_list();
xen_setup_shared_info();
if (suspend_cancelled) {
xen_start_info->store_mfn =
pfn_to_mfn(xen_start_info->store_mfn);
xen_start_info->console.domU.mfn =
pfn_to_mfn(xen_start_info->console.domU.mfn);
} else {
#ifdef CONFIG_SMP
BUG_ON(xen_cpu_initialized_map == NULL);
cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
#endif
xen_vcpu_restore();
}
xen_mm_unpin_all();
}
arch/x86/xen/time.c
View file @ a9648072
......@@ -436,6 +436,14 @@ static void xen_hvm_setup_cpu_clockevents(void)
void __init xen_hvm_init_time_ops(void)
{
/*
* vector callback is needed otherwise we cannot receive interrupts
* on cpu > 0 and at this point we don't know how many cpus are
* available.
*/
if (!xen_have_vector_callback)
return;
if (!xen_feature(XENFEAT_hvm_safe_pvclock)) {
printk(KERN_INFO "Xen doesn't support pvclock on HVM,"
"disable pv timer\n");
......
arch/x86/xen/xen-head.S
View file @ a9648072
......@@ -16,6 +16,7 @@
#include <xen/interface/xen-mca.h>
#include <asm/xen/interface.h>
#ifdef CONFIG_XEN_PV
__INIT
ENTRY(startup_xen)
cld
......@@ -34,6 +35,7 @@ ENTRY(startup_xen)
jmp xen_start_kernel
__FINIT
#endif
.pushsection .text
.balign PAGE_SIZE
......@@ -58,7 +60,9 @@ ENTRY(hypercall_page)
/* Map the p2m table to a 512GB-aligned user address. */
ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
#endif
#ifdef CONFIG_XEN_PV
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
#endif
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
.ascii "!writable_page_tables|pae_pgdir_above_4gb")
......
arch/x86/xen/xen-ops.h
View file @ a9648072
......@@ -76,6 +76,8 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
bool xen_vcpu_stolen(int vcpu);
extern int xen_have_vcpu_info_placement;
void xen_vcpu_setup(int cpu);
void xen_setup_vcpu_info_placement(void);
......@@ -146,4 +148,24 @@ __visible void xen_adjust_exception_frame(void);
extern int xen_panic_handler_init(void);
int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
int (*cpu_dead_cb)(unsigned int));
void xen_pin_vcpu(int cpu);
void xen_emergency_restart(void);
#ifdef CONFIG_XEN_PV
void xen_pv_pre_suspend(void);
void xen_pv_post_suspend(int suspend_cancelled);
#else
static inline void xen_pv_pre_suspend(void) {}
static inline void xen_pv_post_suspend(int suspend_cancelled) {}
#endif
#ifdef CONFIG_XEN_PVHVM
void xen_hvm_post_suspend(int suspend_cancelled);
#else
static inline void xen_hvm_post_suspend(int suspend_cancelled) {}
#endif
#endif /* XEN_OPS_H */
drivers/scsi/xen-scsifront.c
View file @ a9648072
......@@ -434,7 +434,7 @@ static int map_data_for_request(struct vscsifrnt_info *info,
if (seg_grants) {
page = virt_to_page(seg);
off = (unsigned long)seg & ~PAGE_MASK;
off = offset_in_page(seg);
len = sizeof(struct scsiif_request_segment) * data_grants;
while (len > 0) {
bytes = min_t(unsigned int, len, PAGE_SIZE - off);
......
drivers/xen/balloon.c
View file @ a9648072
......@@ -709,6 +709,7 @@ void free_xenballooned_pages(int nr_pages, struct page **pages)
}
EXPORT_SYMBOL(free_xenballooned_pages);
#ifdef CONFIG_XEN_PV
static void __init balloon_add_region(unsigned long start_pfn,
unsigned long pages)
{
......@@ -732,19 +733,22 @@ static void __init balloon_add_region(unsigned long start_pfn,
balloon_stats.total_pages += extra_pfn_end - start_pfn;
}
#endif
static int __init balloon_init(void)
{
int i;
if (!xen_domain())
return -ENODEV;
pr_info("Initialising balloon driver\n");
#ifdef CONFIG_XEN_PV
balloon_stats.current_pages = xen_pv_domain()
? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
: get_num_physpages();
#else
balloon_stats.current_pages = get_num_physpages();
#endif
balloon_stats.target_pages = balloon_stats.current_pages;
balloon_stats.balloon_low = 0;
balloon_stats.balloon_high = 0;
......@@ -761,6 +765,10 @@ static int __init balloon_init(void)
register_sysctl_table(xen_root);
#endif
#ifdef CONFIG_XEN_PV
{
int i;
/*
* Initialize the balloon with pages from the extra memory
* regions (see arch/x86/xen/setup.c).
......@@ -769,6 +777,8 @@ static int __init balloon_init(void)
if (xen_extra_mem[i].n_pfns)
balloon_add_region(xen_extra_mem[i].start_pfn,
xen_extra_mem[i].n_pfns);
}
#endif
return 0;
}
......
drivers/xen/efi.c
View file @ a9648072
......@@ -26,6 +26,7 @@
#include <xen/interface/xen.h>
#include <xen/interface/platform.h>
#include <xen/xen.h>
#include <xen/xen-ops.h>
#include <asm/page.h>
......@@ -263,3 +264,20 @@ efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
return efi_data(op).status;
}
EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);
void xen_efi_reset_system(int reset_type, efi_status_t status,
unsigned long data_size, efi_char16_t *data)
{
switch (reset_type) {
case EFI_RESET_COLD:
case EFI_RESET_WARM:
xen_reboot(SHUTDOWN_reboot);
break;
case EFI_RESET_SHUTDOWN:
xen_reboot(SHUTDOWN_poweroff);
break;
default:
BUG();
}
}
EXPORT_SYMBOL_GPL(xen_efi_reset_system);
drivers/xen/events/events_base.c
View file @ a9648072
......@@ -1312,6 +1312,9 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
if (!VALID_EVTCHN(evtchn))
return -1;
if (!xen_support_evtchn_rebind())
return -1;
/* Send future instances of this interrupt to other vcpu. */
bind_vcpu.port = evtchn;
bind_vcpu.vcpu = xen_vcpu_nr(tcpu);
......@@ -1646,14 +1649,20 @@ void xen_callback_vector(void)
int rc;
uint64_t callback_via;
if (xen_have_vector_callback) {
callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
rc = xen_set_callback_via(callback_via);
BUG_ON(rc);
if (rc) {
pr_err("Request for Xen HVM callback vector failed\n");
xen_have_vector_callback = 0;
return;
}
pr_info("Xen HVM callback vector for event delivery is enabled\n");
/* in the restore case the vector has already been allocated */
if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
xen_hvm_callback_vector);
}
}
#else
void xen_callback_vector(void) {}
......
drivers/xen/platform-pci.c
View file @ a9648072
......@@ -90,8 +90,10 @@ static int xen_allocate_irq(struct pci_dev *pdev)
static int platform_pci_resume(struct pci_dev *pdev)
{
int err;
if (!xen_pv_domain())
if (xen_have_vector_callback)
return 0;
err = xen_set_callback_via(callback_via);
if (err) {
dev_err(&pdev->dev, "platform_pci_resume failure!\n");
......@@ -137,15 +139,7 @@ static int platform_pci_probe(struct pci_dev *pdev,
platform_mmio = mmio_addr;
platform_mmiolen = mmio_len;
/*
* Xen HVM guests always use the vector callback mechanism.
* L1 Dom0 in a nested Xen environment is a PV guest inside in an
* HVM environment. It needs the platform-pci driver to get
* notifications from L0 Xen, but it cannot use the vector callback
* as it is not exported by L1 Xen.
*/
if (xen_pv_domain()) {
if (!xen_have_vector_callback) {
ret = xen_allocate_irq(pdev);
if (ret) {
dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
......
drivers/xen/swiotlb-xen.c
View file @ a9648072
......@@ -693,8 +693,8 @@ xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
unsigned long attrs)
{
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
if (__generic_dma_ops(dev)->mmap)
return __generic_dma_ops(dev)->mmap(dev, vma, cpu_addr,
if (xen_get_dma_ops(dev)->mmap)
return xen_get_dma_ops(dev)->mmap(dev, vma, cpu_addr,
dma_addr, size, attrs);
#endif
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
......@@ -711,7 +711,7 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
unsigned long attrs)
{
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
if (__generic_dma_ops(dev)->get_sgtable) {
if (xen_get_dma_ops(dev)->get_sgtable) {
#if 0
/*
* This check verifies that the page belongs to the current domain and
......@@ -721,7 +721,7 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
unsigned long bfn = PHYS_PFN(dma_to_phys(dev, handle));
BUG_ON (!page_is_ram(bfn));
#endif
return __generic_dma_ops(dev)->get_sgtable(dev, sgt, cpu_addr,
return xen_get_dma_ops(dev)->get_sgtable(dev, sgt, cpu_addr,
handle, size, attrs);
}
#endif
......
include/xen/arm/page-coherent.h
View file @ a9648072
......@@ -2,8 +2,16 @@
#define _ASM_ARM_XEN_PAGE_COHERENT_H
#include <asm/page.h>
#include <asm/dma-mapping.h>
#include <linux/dma-mapping.h>
static inline const struct dma_map_ops *xen_get_dma_ops(struct device *dev)
{
if (dev && dev->archdata.dev_dma_ops)
return dev->archdata.dev_dma_ops;
return get_arch_dma_ops(NULL);
}
void __xen_dma_map_page(struct device *hwdev, struct page *page,
dma_addr_t dev_addr, unsigned long offset, size_t size,
enum dma_data_direction dir, unsigned long attrs);
......@@ -19,13 +27,13 @@ void __xen_dma_sync_single_for_device(struct device *hwdev,
static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
{
return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
return xen_get_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
}
static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
{
__generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
xen_get_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
}
static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
......@@ -49,7 +57,7 @@ static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
* specific function.
*/
if (local)
__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
xen_get_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
else
__xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
}
......@@ -67,8 +75,8 @@ static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
* specific function.
*/
if (pfn_valid(pfn)) {
if (__generic_dma_ops(hwdev)->unmap_page)
__generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
if (xen_get_dma_ops(hwdev)->unmap_page)
xen_get_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
} else
__xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
}
......@@ -78,8 +86,8 @@ static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
{
unsigned long pfn = PFN_DOWN(handle);
if (pfn_valid(pfn)) {
if (__generic_dma_ops(hwdev)->sync_single_for_cpu)
__generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
if (xen_get_dma_ops(hwdev)->sync_single_for_cpu)
xen_get_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
} else
__xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
}
......@@ -89,8 +97,8 @@ static inline void xen_dma_sync_single_for_device(struct device *hwdev,
{
unsigned long pfn = PFN_DOWN(handle);
if (pfn_valid(pfn)) {
if (__generic_dma_ops(hwdev)->sync_single_for_device)
__generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
if (xen_get_dma_ops(hwdev)->sync_single_for_device)
xen_get_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
} else
__xen_dma_sync_single_for_device(hwdev, handle, size, dir);
}
......
include/xen/interface/io/9pfs.h 0 → 100644
View file @ a9648072
/*
* 9pfs.h -- Xen 9PFS transport
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (C) 2017 Stefano Stabellini <stefano@aporeto.com>
*/
#ifndef __XEN_PUBLIC_IO_9PFS_H__
#define __XEN_PUBLIC_IO_9PFS_H__
#include "xen/interface/io/ring.h"
/*
* See docs/misc/9pfs.markdown in xen.git for the full specification:
* https://xenbits.xen.org/docs/unstable/misc/9pfs.html
*/
DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
#endif
include/xen/interface/io/displif.h 0 → 100644
View file @ a9648072
/******************************************************************************
* displif.h
*
* Unified display device I/O interface for Xen guest OSes.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (C) 2016-2017 EPAM Systems Inc.
*
* Authors: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
* Oleksandr Grytsov <oleksandr_grytsov@epam.com>
*/
#ifndef __XEN_PUBLIC_IO_DISPLIF_H__
#define __XEN_PUBLIC_IO_DISPLIF_H__
#include "ring.h"
#include "../grant_table.h"
/*
******************************************************************************
* Protocol version
******************************************************************************
*/
#define XENDISPL_PROTOCOL_VERSION "1"
/*
******************************************************************************
* Main features provided by the protocol
******************************************************************************
* This protocol aims to provide a unified protocol which fits more
* sophisticated use-cases than a framebuffer device can handle. At the
* moment basic functionality is supported with the intention to be extended:
* o multiple dynamically allocated/destroyed framebuffers
* o buffers of arbitrary sizes
* o buffer allocation at either back or front end
* o better configuration options including multiple display support
*
* Note: existing fbif can be used together with displif running at the
* same time, e.g. on Linux one provides framebuffer and another DRM/KMS
*
* Note: display resolution (XenStore's "resolution" property) defines
* visible area of the virtual display. At the same time resolution of
* the display and frame buffers may differ: buffers can be smaller, equal
* or bigger than the visible area. This is to enable use-cases, where backend
* may do some post-processing of the display and frame buffers supplied,
* e.g. those buffers can be just a part of the final composition.
*
******************************************************************************
* Direction of improvements
******************************************************************************
* Future extensions to the existing protocol may include:
* o display/connector cloning
* o allocation of objects other than display buffers
* o plane/overlay support
* o scaling support
* o rotation support
*
******************************************************************************
* Feature and Parameter Negotiation
******************************************************************************
*
* Front->back notifications: when enqueuing a new request, sending a
* notification can be made conditional on xendispl_req (i.e., the generic
* hold-off mechanism provided by the ring macros). Backends must set
* xendispl_req appropriately (e.g., using RING_FINAL_CHECK_FOR_REQUESTS()).
*
* Back->front notifications: when enqueuing a new response, sending a
* notification can be made conditional on xendispl_resp (i.e., the generic
* hold-off mechanism provided by the ring macros). Frontends must set
* xendispl_resp appropriately (e.g., using RING_FINAL_CHECK_FOR_RESPONSES()).
*
* The two halves of a para-virtual display driver utilize nodes within
* XenStore to communicate capabilities and to negotiate operating parameters.
* This section enumerates these nodes which reside in the respective front and
* backend portions of XenStore, following the XenBus convention.
*
* All data in XenStore is stored as strings. Nodes specifying numeric
* values are encoded in decimal. Integer value ranges listed below are
* expressed as fixed sized integer types capable of storing the conversion
* of a properly formated node string, without loss of information.
*
******************************************************************************
* Example configuration
******************************************************************************
*
* Note: depending on the use-case backend can expose more display connectors
* than the underlying HW physically has by employing SW graphics compositors
*
* This is an example of backend and frontend configuration:
*
*--------------------------------- Backend -----------------------------------
*
* /local/domain/0/backend/vdispl/1/0/frontend-id = "1"
* /local/domain/0/backend/vdispl/1/0/frontend = "/local/domain/1/device/vdispl/0"
* /local/domain/0/backend/vdispl/1/0/state = "4"
* /local/domain/0/backend/vdispl/1/0/versions = "1,2"
*
*--------------------------------- Frontend ----------------------------------
*
* /local/domain/1/device/vdispl/0/backend-id = "0"
* /local/domain/1/device/vdispl/0/backend = "/local/domain/0/backend/vdispl/1/0"
* /local/domain/1/device/vdispl/0/state = "4"
* /local/domain/1/device/vdispl/0/version = "1"
* /local/domain/1/device/vdispl/0/be-alloc = "1"
*
*-------------------------- Connector 0 configuration ------------------------
*
* /local/domain/1/device/vdispl/0/0/resolution = "1920x1080"
* /local/domain/1/device/vdispl/0/0/req-ring-ref = "2832"
* /local/domain/1/device/vdispl/0/0/req-event-channel = "15"
* /local/domain/1/device/vdispl/0/0/evt-ring-ref = "387"
* /local/domain/1/device/vdispl/0/0/evt-event-channel = "16"
*
*-------------------------- Connector 1 configuration ------------------------
*
* /local/domain/1/device/vdispl/0/1/resolution = "800x600"
* /local/domain/1/device/vdispl/0/1/req-ring-ref = "2833"
* /local/domain/1/device/vdispl/0/1/req-event-channel = "17"
* /local/domain/1/device/vdispl/0/1/evt-ring-ref = "388"
* /local/domain/1/device/vdispl/0/1/evt-event-channel = "18"
*
******************************************************************************
* Backend XenBus Nodes
******************************************************************************
*
*----------------------------- Protocol version ------------------------------
*
* versions
* Values: <string>
*
* List of XENDISPL_LIST_SEPARATOR separated protocol versions supported
* by the backend. For example "1,2,3".
*
******************************************************************************
* Frontend XenBus Nodes
******************************************************************************
*
*-------------------------------- Addressing ---------------------------------
*
* dom-id
* Values: <uint16_t>
*
* Domain identifier.
*
* dev-id
* Values: <uint16_t>
*
* Device identifier.
*
* conn-idx
* Values: <uint8_t>
*
* Zero based contigous index of the connector.
* /local/domain/<dom-id>/device/vdispl/<dev-id>/<conn-idx>/...
*
*----------------------------- Protocol version ------------------------------
*
* version
* Values: <string>
*
* Protocol version, chosen among the ones supported by the backend.
*
*------------------------- Backend buffer allocation -------------------------
*
* be-alloc
* Values: "0", "1"
*
* If value is set to "1", then backend can be a buffer provider/allocator
* for this domain during XENDISPL_OP_DBUF_CREATE operation (see below
* for negotiation).
* If value is not "1" or omitted frontend must allocate buffers itself.
*
*----------------------------- Connector settings ----------------------------
*
* resolution
* Values: <width, uint32_t>x<height, uint32_t>
*
* Width and height of the connector in pixels separated by
* XENDISPL_RESOLUTION_SEPARATOR. This defines visible area of the
* display.
*
*------------------ Connector Request Transport Parameters -------------------
*
* This communication path is used to deliver requests from frontend to backend
* and get the corresponding responses from backend to frontend,
* set up per connector.
*
* req-event-channel
* Values: <uint32_t>
*
* The identifier of the Xen connector's control event channel
* used to signal activity in the ring buffer.
*
* req-ring-ref
* Values: <uint32_t>
*
* The Xen grant reference granting permission for the backend to map
* a sole page of connector's control ring buffer.
*
*------------------- Connector Event Transport Parameters --------------------
*
* This communication path is used to deliver asynchronous events from backend
* to frontend, set up per connector.
*
* evt-event-channel
* Values: <uint32_t>
*
* The identifier of the Xen connector's event channel
* used to signal activity in the ring buffer.
*
* evt-ring-ref
* Values: <uint32_t>
*
* The Xen grant reference granting permission for the backend to map
* a sole page of connector's event ring buffer.
*/
/*
******************************************************************************
* STATE DIAGRAMS
******************************************************************************
*
* Tool stack creates front and back state nodes with initial state
* XenbusStateInitialising.
* Tool stack creates and sets up frontend display configuration
* nodes per domain.
*
*-------------------------------- Normal flow --------------------------------
*
* Front Back
* ================================= =====================================
* XenbusStateInitialising XenbusStateInitialising
* o Query backend device identification
* data.
* o Open and validate backend device.
* |
* |
* V
* XenbusStateInitWait
*
* o Query frontend configuration
* o Allocate and initialize
* event channels per configured
* connector.
* o Publish transport parameters
* that will be in effect during
* this connection.
* |
* |
* V
* XenbusStateInitialised
*
* o Query frontend transport parameters.
* o Connect to the event channels.
* |
* |
* V
* XenbusStateConnected
*
* o Create and initialize OS
* virtual display connectors
* as per configuration.
* |
* |
* V
* XenbusStateConnected
*
* XenbusStateUnknown
* XenbusStateClosed
* XenbusStateClosing
* o Remove virtual display device
* o Remove event channels
* |
* |
* V
* XenbusStateClosed
*
*------------------------------- Recovery flow -------------------------------
*
* In case of frontend unrecoverable errors backend handles that as
* if frontend goes into the XenbusStateClosed state.
*
* In case of backend unrecoverable errors frontend tries removing
* the virtualized device. If this is possible at the moment of error,
* then frontend goes into the XenbusStateInitialising state and is ready for
* new connection with backend. If the virtualized device is still in use and
* cannot be removed, then frontend goes into the XenbusStateReconfiguring state
* until either the virtualized device is removed or backend initiates a new
* connection. On the virtualized device removal frontend goes into the
* XenbusStateInitialising state.
*
* Note on XenbusStateReconfiguring state of the frontend: if backend has
* unrecoverable errors then frontend cannot send requests to the backend
* and thus cannot provide functionality of the virtualized device anymore.
* After backend is back to normal the virtualized device may still hold some
* state: configuration in use, allocated buffers, client application state etc.
* In most cases, this will require frontend to implement complex recovery
* reconnect logic. Instead, by going into XenbusStateReconfiguring state,
* frontend will make sure no new clients of the virtualized device are
* accepted, allow existing client(s) to exit gracefully by signaling error
* state etc.
* Once all the clients are gone frontend can reinitialize the virtualized
* device and get into XenbusStateInitialising state again signaling the
* backend that a new connection can be made.
*
* There are multiple conditions possible under which frontend will go from
* XenbusStateReconfiguring into XenbusStateInitialising, some of them are OS
* specific. For example:
* 1. The underlying OS framework may provide callbacks to signal that the last
* client of the virtualized device has gone and the device can be removed
* 2. Frontend can schedule a deferred work (timer/tasklet/workqueue)
* to periodically check if this is the right time to re-try removal of
* the virtualized device.
* 3. By any other means.
*
******************************************************************************
* REQUEST CODES
******************************************************************************
* Request codes [0; 15] are reserved and must not be used
*/
#define XENDISPL_OP_DBUF_CREATE 0x10
#define XENDISPL_OP_DBUF_DESTROY 0x11
#define XENDISPL_OP_FB_ATTACH 0x12
#define XENDISPL_OP_FB_DETACH 0x13
#define XENDISPL_OP_SET_CONFIG 0x14
#define XENDISPL_OP_PG_FLIP 0x15
/*
******************************************************************************
* EVENT CODES
******************************************************************************
*/
#define XENDISPL_EVT_PG_FLIP 0x00
/*
******************************************************************************
* XENSTORE FIELD AND PATH NAME STRINGS, HELPERS
******************************************************************************
*/
#define XENDISPL_DRIVER_NAME "vdispl"
#define XENDISPL_LIST_SEPARATOR ","
#define XENDISPL_RESOLUTION_SEPARATOR "x"
#define XENDISPL_FIELD_BE_VERSIONS "versions"
#define XENDISPL_FIELD_FE_VERSION "version"
#define XENDISPL_FIELD_REQ_RING_REF "req-ring-ref"
#define XENDISPL_FIELD_REQ_CHANNEL "req-event-channel"
#define XENDISPL_FIELD_EVT_RING_REF "evt-ring-ref"
#define XENDISPL_FIELD_EVT_CHANNEL "evt-event-channel"
#define XENDISPL_FIELD_RESOLUTION "resolution"
#define XENDISPL_FIELD_BE_ALLOC "be-alloc"
/*
******************************************************************************
* STATUS RETURN CODES
******************************************************************************
*
* Status return code is zero on success and -XEN_EXX on failure.
*
******************************************************************************
* Assumptions
******************************************************************************
* o usage of grant reference 0 as invalid grant reference:
* grant reference 0 is valid, but never exposed to a PV driver,
* because of the fact it is already in use/reserved by the PV console.
* o all references in this document to page sizes must be treated
* as pages of size XEN_PAGE_SIZE unless otherwise noted.
*
******************************************************************************
* Description of the protocol between frontend and backend driver
******************************************************************************
*
* The two halves of a Para-virtual display driver communicate with
* each other using shared pages and event channels.
* Shared page contains a ring with request/response packets.
*
* All reserved fields in the structures below must be 0.
* Display buffers's cookie of value 0 is treated as invalid.
* Framebuffer's cookie of value 0 is treated as invalid.
*
* For all request/response/event packets that use cookies:
* dbuf_cookie - uint64_t, unique to guest domain value used by the backend
* to map remote display buffer to its local one
* fb_cookie - uint64_t, unique to guest domain value used by the backend
* to map remote framebuffer to its local one
*
*---------------------------------- Requests ---------------------------------
*
* All requests/responses, which are not connector specific, must be sent over
* control ring of the connector which has the index value of 0:
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
*
* All request packets have the same length (64 octets)
* All request packets have common header:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | operation | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* id - uint16_t, private guest value, echoed in response
* operation - uint8_t, operation code, XENDISPL_OP_???
*
* Request dbuf creation - request creation of a display buffer.
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id |_OP_DBUF_CREATE | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | dbuf_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | dbuf_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | width | 20
* +----------------+----------------+----------------+----------------+
* | height | 24
* +----------------+----------------+----------------+----------------+
* | bpp | 28
* +----------------+----------------+----------------+----------------+
* | buffer_sz | 32
* +----------------+----------------+----------------+----------------+
* | flags | 36
* +----------------+----------------+----------------+----------------+
* | gref_directory | 40
* +----------------+----------------+----------------+----------------+
* | reserved | 44
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*
* Must be sent over control ring of the connector which has the index
* value of 0:
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
* All unused bits in flags field must be set to 0.
*
* An attempt to create multiple display buffers with the same dbuf_cookie is
* an error. dbuf_cookie can be re-used after destroying the corresponding
* display buffer.
*
* Width and height of the display buffers can be smaller, equal or bigger
* than the connector's resolution. Depth/pixel format of the individual
* buffers can differ as well.
*
* width - uint32_t, width in pixels
* height - uint32_t, height in pixels
* bpp - uint32_t, bits per pixel
* buffer_sz - uint32_t, buffer size to be allocated, octets
* flags - uint32_t, flags of the operation
* o XENDISPL_DBUF_FLG_REQ_ALLOC - if set, then backend is requested
* to allocate the buffer with the parameters provided in this request.
* Page directory is handled as follows:
* Frontend on request:
* o allocates pages for the directory (gref_directory,
* gref_dir_next_page(s)
* o grants permissions for the pages of the directory to the backend
* o sets gref_dir_next_page fields
* Backend on response:
* o grants permissions for the pages of the buffer allocated to
* the frontend
* o fills in page directory with grant references
* (gref[] in struct xendispl_page_directory)
* gref_directory - grant_ref_t, a reference to the first shared page
* describing shared buffer references. At least one page exists. If shared
* buffer size (buffer_sz) exceeds what can be addressed by this single page,
* then reference to the next page must be supplied (see gref_dir_next_page
* below)
*/
#define XENDISPL_DBUF_FLG_REQ_ALLOC (1 << 0)
struct xendispl_dbuf_create_req {
uint64_t dbuf_cookie;
uint32_t width;
uint32_t height;
uint32_t bpp;
uint32_t buffer_sz;
uint32_t flags;
grant_ref_t gref_directory;
};
/*
* Shared page for XENDISPL_OP_DBUF_CREATE buffer descriptor (gref_directory in
* the request) employs a list of pages, describing all pages of the shared
* data buffer:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | gref_dir_next_page | 4
* +----------------+----------------+----------------+----------------+
* | gref[0] | 8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | gref[i] | i*4+8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | gref[N - 1] | N*4+8
* +----------------+----------------+----------------+----------------+
*
* gref_dir_next_page - grant_ref_t, reference to the next page describing
* page directory. Must be 0 if there are no more pages in the list.
* gref[i] - grant_ref_t, reference to a shared page of the buffer
* allocated at XENDISPL_OP_DBUF_CREATE
*
* Number of grant_ref_t entries in the whole page directory is not
* passed, but instead can be calculated as:
* num_grefs_total = (XENDISPL_OP_DBUF_CREATE.buffer_sz + XEN_PAGE_SIZE - 1) /
* XEN_PAGE_SIZE
*/
struct xendispl_page_directory {
grant_ref_t gref_dir_next_page;
grant_ref_t gref[1]; /* Variable length */
};
/*
* Request dbuf destruction - destroy a previously allocated display buffer:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id |_OP_DBUF_DESTROY| reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | dbuf_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | dbuf_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*
* Must be sent over control ring of the connector which has the index
* value of 0:
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
*/
struct xendispl_dbuf_destroy_req {
uint64_t dbuf_cookie;
};
/*
* Request framebuffer attachment - request attachment of a framebuffer to
* previously created display buffer.
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | _OP_FB_ATTACH | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | dbuf_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | dbuf_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | fb_cookie low 32-bit | 20
* +----------------+----------------+----------------+----------------+
* | fb_cookie high 32-bit | 24
* +----------------+----------------+----------------+----------------+
* | width | 28
* +----------------+----------------+----------------+----------------+
* | height | 32
* +----------------+----------------+----------------+----------------+
* | pixel_format | 36
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*
* Must be sent over control ring of the connector which has the index
* value of 0:
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
* Width and height can be smaller, equal or bigger than the connector's
* resolution.
*
* An attempt to create multiple frame buffers with the same fb_cookie is
* an error. fb_cookie can be re-used after destroying the corresponding
* frame buffer.
*
* width - uint32_t, width in pixels
* height - uint32_t, height in pixels
* pixel_format - uint32_t, pixel format of the framebuffer, FOURCC code
*/
struct xendispl_fb_attach_req {
uint64_t dbuf_cookie;
uint64_t fb_cookie;
uint32_t width;
uint32_t height;
uint32_t pixel_format;
};
/*
* Request framebuffer detach - detach a previously
* attached framebuffer from the display buffer in request:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | _OP_FB_DETACH | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | fb_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | fb_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*
* Must be sent over control ring of the connector which has the index
* value of 0:
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
*/
struct xendispl_fb_detach_req {
uint64_t fb_cookie;
};
/*
* Request configuration set/reset - request to set or reset
* the configuration/mode of the display:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | _OP_SET_CONFIG | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | fb_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | fb_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | x | 20
* +----------------+----------------+----------------+----------------+
* | y | 24
* +----------------+----------------+----------------+----------------+
* | width | 28
* +----------------+----------------+----------------+----------------+
* | height | 32
* +----------------+----------------+----------------+----------------+
* | bpp | 40
* +----------------+----------------+----------------+----------------+
* | reserved | 44
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*
* Pass all zeros to reset, otherwise command is treated as
* configuration set.
* Framebuffer's cookie defines which framebuffer/dbuf must be
* displayed while enabling display (applying configuration).
* x, y, width and height are bound by the connector's resolution and must not
* exceed it.
*
* x - uint32_t, starting position in pixels by X axis
* y - uint32_t, starting position in pixels by Y axis
* width - uint32_t, width in pixels
* height - uint32_t, height in pixels
* bpp - uint32_t, bits per pixel
*/
struct xendispl_set_config_req {
uint64_t fb_cookie;
uint32_t x;
uint32_t y;
uint32_t width;
uint32_t height;
uint32_t bpp;
};
/*
* Request page flip - request to flip a page identified by the framebuffer
* cookie:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | _OP_PG_FLIP | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | fb_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | fb_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*/
struct xendispl_page_flip_req {
uint64_t fb_cookie;
};
/*
*---------------------------------- Responses --------------------------------
*
* All response packets have the same length (64 octets)
*
* All response packets have common header:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | status | 8
* +----------------+----------------+----------------+----------------+
* | reserved | 12
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*
* id - uint16_t, private guest value, echoed from request
* status - int32_t, response status, zero on success and -XEN_EXX on failure
*
*----------------------------------- Events ----------------------------------
*
* Events are sent via a shared page allocated by the front and propagated by
* evt-event-channel/evt-ring-ref XenStore entries
* All event packets have the same length (64 octets)
* All event packets have common header:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | type | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
*
* id - uint16_t, event id, may be used by front
* type - uint8_t, type of the event
*
*
* Page flip complete event - event from back to front on page flip completed:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | _EVT_PG_FLIP | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | fb_cookie low 32-bit | 12
* +----------------+----------------+----------------+----------------+
* | fb_cookie high 32-bit | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 64
* +----------------+----------------+----------------+----------------+
*/
struct xendispl_pg_flip_evt {
uint64_t fb_cookie;
};
struct xendispl_req {
uint16_t id;
uint8_t operation;
uint8_t reserved[5];
union {
struct xendispl_dbuf_create_req dbuf_create;
struct xendispl_dbuf_destroy_req dbuf_destroy;
struct xendispl_fb_attach_req fb_attach;
struct xendispl_fb_detach_req fb_detach;
struct xendispl_set_config_req set_config;
struct xendispl_page_flip_req pg_flip;
uint8_t reserved[56];
} op;
};
struct xendispl_resp {
uint16_t id;
uint8_t operation;
uint8_t reserved;
int32_t status;
uint8_t reserved1[56];
};
struct xendispl_evt {
uint16_t id;
uint8_t type;
uint8_t reserved[5];
union {
struct xendispl_pg_flip_evt pg_flip;
uint8_t reserved[56];
} op;
};
DEFINE_RING_TYPES(xen_displif, struct xendispl_req, struct xendispl_resp);
/*
******************************************************************************
* Back to front events delivery
******************************************************************************
* In order to deliver asynchronous events from back to front a shared page is
* allocated by front and its granted reference propagated to back via
* XenStore entries (evt-ring-ref/evt-event-channel).
* This page has a common header used by both front and back to synchronize
* access and control event's ring buffer, while back being a producer of the
* events and front being a consumer. The rest of the page after the header
* is used for event packets.
*
* Upon reception of an event(s) front may confirm its reception
* for either each event, group of events or none.
*/
struct xendispl_event_page {
uint32_t in_cons;
uint32_t in_prod;
uint8_t reserved[56];
};
#define XENDISPL_EVENT_PAGE_SIZE XEN_PAGE_SIZE
#define XENDISPL_IN_RING_OFFS (sizeof(struct xendispl_event_page))
#define XENDISPL_IN_RING_SIZE (XENDISPL_EVENT_PAGE_SIZE - XENDISPL_IN_RING_OFFS)
#define XENDISPL_IN_RING_LEN (XENDISPL_IN_RING_SIZE / sizeof(struct xendispl_evt))
#define XENDISPL_IN_RING(page) \
((struct xendispl_evt *)((char *)(page) + XENDISPL_IN_RING_OFFS))
#define XENDISPL_IN_RING_REF(page, idx) \
(XENDISPL_IN_RING((page))[(idx) % XENDISPL_IN_RING_LEN])
#endif /* __XEN_PUBLIC_IO_DISPLIF_H__ */
include/xen/interface/io/kbdif.h
View file @ a9648072
......@@ -26,43 +26,432 @@
#ifndef __XEN_PUBLIC_IO_KBDIF_H__
#define __XEN_PUBLIC_IO_KBDIF_H__
/* In events (backend -> frontend) */
/*
*****************************************************************************
* Feature and Parameter Negotiation
*****************************************************************************
*
* The two halves of a para-virtual driver utilize nodes within
* XenStore to communicate capabilities and to negotiate operating parameters.
* This section enumerates these nodes which reside in the respective front and
* backend portions of XenStore, following XenBus convention.
*
* All data in XenStore is stored as strings. Nodes specifying numeric
* values are encoded in decimal. Integer value ranges listed below are
* expressed as fixed sized integer types capable of storing the conversion
* of a properly formated node string, without loss of information.
*
*****************************************************************************
* Backend XenBus Nodes
*****************************************************************************
*
*---------------------------- Features supported ----------------------------
*
* Capable backend advertises supported features by publishing
* corresponding entries in XenStore and puts 1 as the value of the entry.
* If a feature is not supported then 0 must be set or feature entry omitted.
*
* feature-abs-pointer
* Values: <uint>
*
* Backends, which support reporting of absolute coordinates for pointer
* device should set this to 1.
*
* feature-multi-touch
* Values: <uint>
*
* Backends, which support reporting of multi-touch events
* should set this to 1.
*
*------------------------- Pointer Device Parameters ------------------------
*
* width
* Values: <uint>
*
* Maximum X coordinate (width) to be used by the frontend
* while reporting input events, pixels, [0; UINT32_MAX].
*
* height
* Values: <uint>
*
* Maximum Y coordinate (height) to be used by the frontend
* while reporting input events, pixels, [0; UINT32_MAX].
*
*****************************************************************************
* Frontend XenBus Nodes
*****************************************************************************
*
*------------------------------ Feature request -----------------------------
*
* Capable frontend requests features from backend via setting corresponding
* entries to 1 in XenStore. Requests for features not advertised as supported
* by the backend have no effect.
*
* request-abs-pointer
* Values: <uint>
*
* Request backend to report absolute pointer coordinates
* (XENKBD_TYPE_POS) instead of relative ones (XENKBD_TYPE_MOTION).
*
* request-multi-touch
* Values: <uint>
*
* Request backend to report multi-touch events.
*
*----------------------- Request Transport Parameters -----------------------
*
* event-channel
* Values: <uint>
*
* The identifier of the Xen event channel used to signal activity
* in the ring buffer.
*
* page-gref
* Values: <uint>
*
* The Xen grant reference granting permission for the backend to map
* a sole page in a single page sized event ring buffer.
*
* page-ref
* Values: <uint>
*
* OBSOLETE, not recommended for use.
* PFN of the shared page.
*
*----------------------- Multi-touch Device Parameters -----------------------
*
* multi-touch-num-contacts
* Values: <uint>
*
* Number of simultaneous touches reported.
*
* multi-touch-width
* Values: <uint>
*
* Width of the touch area to be used by the frontend
* while reporting input events, pixels, [0; UINT32_MAX].
*
* multi-touch-height
* Values: <uint>
*
* Height of the touch area to be used by the frontend
* while reporting input events, pixels, [0; UINT32_MAX].
*/
/*
* Frontends should ignore unknown in events.
* EVENT CODES.
*/
/* Pointer movement event */
#define XENKBD_TYPE_MOTION 1
/* Event type 2 currently not used */
/* Key event (includes pointer buttons) */
#define XENKBD_TYPE_RESERVED 2
#define XENKBD_TYPE_KEY 3
#define XENKBD_TYPE_POS 4
#define XENKBD_TYPE_MTOUCH 5
/* Multi-touch event sub-codes */
#define XENKBD_MT_EV_DOWN 0
#define XENKBD_MT_EV_UP 1
#define XENKBD_MT_EV_MOTION 2
#define XENKBD_MT_EV_SYN 3
#define XENKBD_MT_EV_SHAPE 4
#define XENKBD_MT_EV_ORIENT 5
/*
* Pointer position event
* Capable backend sets feature-abs-pointer in xenstore.
* Frontend requests ot instead of XENKBD_TYPE_MOTION by setting
* request-abs-update in xenstore.
* CONSTANTS, XENSTORE FIELD AND PATH NAME STRINGS, HELPERS.
*/
#define XENKBD_DRIVER_NAME "vkbd"
#define XENKBD_FIELD_FEAT_ABS_POINTER "feature-abs-pointer"
#define XENKBD_FIELD_FEAT_MTOUCH "feature-multi-touch"
#define XENKBD_FIELD_REQ_ABS_POINTER "request-abs-pointer"
#define XENKBD_FIELD_REQ_MTOUCH "request-multi-touch"
#define XENKBD_FIELD_RING_GREF "page-gref"
#define XENKBD_FIELD_EVT_CHANNEL "event-channel"
#define XENKBD_FIELD_WIDTH "width"
#define XENKBD_FIELD_HEIGHT "height"
#define XENKBD_FIELD_MT_WIDTH "multi-touch-width"
#define XENKBD_FIELD_MT_HEIGHT "multi-touch-height"
#define XENKBD_FIELD_MT_NUM_CONTACTS "multi-touch-num-contacts"
/* OBSOLETE, not recommended for use */
#define XENKBD_FIELD_RING_REF "page-ref"
/*
*****************************************************************************
* Description of the protocol between frontend and backend driver.
*****************************************************************************
*
* The two halves of a Para-virtual driver communicate with
* each other using a shared page and an event channel.
* Shared page contains a ring with event structures.
*
* All reserved fields in the structures below must be 0.
*
*****************************************************************************
* Backend to frontend events
*****************************************************************************
*
* Frontends should ignore unknown in events.
* All event packets have the same length (40 octets)
* All event packets have common header:
*
* 0 octet
* +-----------------+
* | type |
* +-----------------+
* type - uint8_t, event code, XENKBD_TYPE_???
*
*
* Pointer relative movement event
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MOTION | reserved | 4
* +----------------+----------------+----------------+----------------+
* | rel_x | 8
* +----------------+----------------+----------------+----------------+
* | rel_y | 12
* +----------------+----------------+----------------+----------------+
* | rel_z | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* rel_x - int32_t, relative X motion
* rel_y - int32_t, relative Y motion
* rel_z - int32_t, relative Z motion (wheel)
*/
#define XENKBD_TYPE_POS 4
struct xenkbd_motion {
uint8_t type; /* XENKBD_TYPE_MOTION */
int32_t rel_x; /* relative X motion */
int32_t rel_y; /* relative Y motion */
int32_t rel_z; /* relative Z motion (wheel) */
uint8_t type;
int32_t rel_x;
int32_t rel_y;
int32_t rel_z;
};
/*
* Key event (includes pointer buttons)
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_KEY | pressed | reserved | 4
* +----------------+----------------+----------------+----------------+
* | keycode | 8
* +----------------+----------------+----------------+----------------+
* | reserved | 12
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* pressed - uint8_t, 1 if pressed; 0 otherwise
* keycode - uint32_t, KEY_* from linux/input.h
*/
struct xenkbd_key {
uint8_t type; /* XENKBD_TYPE_KEY */
uint8_t pressed; /* 1 if pressed; 0 otherwise */
uint32_t keycode; /* KEY_* from linux/input.h */
uint8_t type;
uint8_t pressed;
uint32_t keycode;
};
/*
* Pointer absolute position event
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_POS | reserved | 4
* +----------------+----------------+----------------+----------------+
* | abs_x | 8
* +----------------+----------------+----------------+----------------+
* | abs_y | 12
* +----------------+----------------+----------------+----------------+
* | rel_z | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* abs_x - int32_t, absolute X position (in FB pixels)
* abs_y - int32_t, absolute Y position (in FB pixels)
* rel_z - int32_t, relative Z motion (wheel)
*/
struct xenkbd_position {
uint8_t type; /* XENKBD_TYPE_POS */
int32_t abs_x; /* absolute X position (in FB pixels) */
int32_t abs_y; /* absolute Y position (in FB pixels) */
int32_t rel_z; /* relative Z motion (wheel) */
uint8_t type;
int32_t abs_x;
int32_t abs_y;
int32_t rel_z;
};
/*
* Multi-touch event and its sub-types
*
* All multi-touch event packets have common header:
*
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | event_type | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
*
* event_type - unt8_t, multi-touch event sub-type, XENKBD_MT_EV_???
* contact_id - unt8_t, ID of the contact
*
* Touch interactions can consist of one or more contacts.
* For each contact, a series of events is generated, starting
* with a down event, followed by zero or more motion events,
* and ending with an up event. Events relating to the same
* contact point can be identified by the ID of the sequence: contact ID.
* Contact ID may be reused after XENKBD_MT_EV_UP event and
* is in the [0; XENKBD_FIELD_NUM_CONTACTS - 1] range.
*
* For further information please refer to documentation on Wayland [1],
* Linux [2] and Windows [3] multi-touch support.
*
* [1] https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml
* [2] https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
* [3] https://msdn.microsoft.com/en-us/library/jj151564(v=vs.85).aspx
*
*
* Multi-touch down event - sent when a new touch is made: touch is assigned
* a unique contact ID, sent with this and consequent events related
* to this touch.
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | _MT_EV_DOWN | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | abs_x | 12
* +----------------+----------------+----------------+----------------+
* | abs_y | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* abs_x - int32_t, absolute X position, in pixels
* abs_y - int32_t, absolute Y position, in pixels
*
* Multi-touch contact release event
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | _MT_EV_UP | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* Multi-touch motion event
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | _MT_EV_MOTION | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | abs_x | 12
* +----------------+----------------+----------------+----------------+
* | abs_y | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* abs_x - int32_t, absolute X position, in pixels,
* abs_y - int32_t, absolute Y position, in pixels,
*
* Multi-touch input synchronization event - shows end of a set of events
* which logically belong together.
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | _MT_EV_SYN | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* Multi-touch shape event - touch point's shape has changed its shape.
* Shape is approximated by an ellipse through the major and minor axis
* lengths: major is the longer diameter of the ellipse and minor is the
* shorter one. Center of the ellipse is reported via
* XENKBD_MT_EV_DOWN/XENKBD_MT_EV_MOTION events.
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | _MT_EV_SHAPE | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | major | 12
* +----------------+----------------+----------------+----------------+
* | minor | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* major - unt32_t, length of the major axis, pixels
* minor - unt32_t, length of the minor axis, pixels
*
* Multi-touch orientation event - touch point's shape has changed
* its orientation: calculated as a clockwise angle between the major axis
* of the ellipse and positive Y axis in degrees, [-180; +180].
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | _TYPE_MTOUCH | _MT_EV_ORIENT | contact_id | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | orientation | reserved | 12
* +----------------+----------------+----------------+----------------+
* | reserved | 16
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 40
* +----------------+----------------+----------------+----------------+
*
* orientation - int16_t, clockwise angle of the major axis
*/
struct xenkbd_mtouch {
uint8_t type; /* XENKBD_TYPE_MTOUCH */
uint8_t event_type; /* XENKBD_MT_EV_??? */
uint8_t contact_id;
uint8_t reserved[5]; /* reserved for the future use */
union {
struct {
int32_t abs_x; /* absolute X position, pixels */
int32_t abs_y; /* absolute Y position, pixels */
} pos;
struct {
uint32_t major; /* length of the major axis, pixels */
uint32_t minor; /* length of the minor axis, pixels */
} shape;
int16_t orientation; /* clockwise angle of the major axis */
} u;
};
#define XENKBD_IN_EVENT_SIZE 40
......@@ -72,15 +461,26 @@ union xenkbd_in_event {
struct xenkbd_motion motion;
struct xenkbd_key key;
struct xenkbd_position pos;
struct xenkbd_mtouch mtouch;
char pad[XENKBD_IN_EVENT_SIZE];
};
/* Out events (frontend -> backend) */
/*
*****************************************************************************
* Frontend to backend events
*****************************************************************************
*
* Out events may be sent only when requested by backend, and receipt
* of an unknown out event is an error.
* No out events currently defined.
* All event packets have the same length (40 octets)
* All event packets have common header:
* 0 octet
* +-----------------+
* | type |
* +-----------------+
* type - uint8_t, event code
*/
#define XENKBD_OUT_EVENT_SIZE 40
......@@ -90,7 +490,11 @@ union xenkbd_out_event {
char pad[XENKBD_OUT_EVENT_SIZE];
};
/* shared page */
/*
*****************************************************************************
* Shared page
*****************************************************************************
*/
#define XENKBD_IN_RING_SIZE 2048
#define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
......@@ -113,4 +517,4 @@ struct xenkbd_page {
uint32_t out_cons, out_prod;
};
#endif
#endif /* __XEN_PUBLIC_IO_KBDIF_H__ */
include/xen/interface/io/ring.h
View file @ a9648072
......@@ -283,4 +283,147 @@ struct __name##_back_ring { \
(_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
} while (0)
/*
* DEFINE_XEN_FLEX_RING_AND_INTF defines two monodirectional rings and
* functions to check if there is data on the ring, and to read and
* write to them.
*
* DEFINE_XEN_FLEX_RING is similar to DEFINE_XEN_FLEX_RING_AND_INTF, but
* does not define the indexes page. As different protocols can have
* extensions to the basic format, this macro allow them to define their
* own struct.
*
* XEN_FLEX_RING_SIZE
* Convenience macro to calculate the size of one of the two rings
* from the overall order.
*
* $NAME_mask
* Function to apply the size mask to an index, to reduce the index
* within the range [0-size].
*
* $NAME_read_packet
* Function to read data from the ring. The amount of data to read is
* specified by the "size" argument.
*
* $NAME_write_packet
* Function to write data to the ring. The amount of data to write is
* specified by the "size" argument.
*
* $NAME_get_ring_ptr
* Convenience function that returns a pointer to read/write to the
* ring at the right location.
*
* $NAME_data_intf
* Indexes page, shared between frontend and backend. It also
* contains the array of grant refs.
*
* $NAME_queued
* Function to calculate how many bytes are currently on the ring,
* ready to be read. It can also be used to calculate how much free
* space is currently on the ring (XEN_FLEX_RING_SIZE() -
* $NAME_queued()).
*/
#ifndef XEN_PAGE_SHIFT
/* The PAGE_SIZE for ring protocols and hypercall interfaces is always
* 4K, regardless of the architecture, and page granularity chosen by
* operating systems.
*/
#define XEN_PAGE_SHIFT 12
#endif
#define XEN_FLEX_RING_SIZE(order) \
(1UL << ((order) + XEN_PAGE_SHIFT - 1))
#define DEFINE_XEN_FLEX_RING(name) \
static inline RING_IDX name##_mask(RING_IDX idx, RING_IDX ring_size) \
{ \
return idx & (ring_size - 1); \
} \
\
static inline unsigned char *name##_get_ring_ptr(unsigned char *buf, \
RING_IDX idx, \
RING_IDX ring_size) \
{ \
return buf + name##_mask(idx, ring_size); \
} \
\
static inline void name##_read_packet(void *opaque, \
const unsigned char *buf, \
size_t size, \
RING_IDX masked_prod, \
RING_IDX *masked_cons, \
RING_IDX ring_size) \
{ \
if (*masked_cons < masked_prod || \
size <= ring_size - *masked_cons) { \
memcpy(opaque, buf + *masked_cons, size); \
} else { \
memcpy(opaque, buf + *masked_cons, ring_size - *masked_cons); \
memcpy((unsigned char *)opaque + ring_size - *masked_cons, buf, \
size - (ring_size - *masked_cons)); \
} \
*masked_cons = name##_mask(*masked_cons + size, ring_size); \
} \
\
static inline void name##_write_packet(unsigned char *buf, \
const void *opaque, \
size_t size, \
RING_IDX *masked_prod, \
RING_IDX masked_cons, \
RING_IDX ring_size) \
{ \
if (*masked_prod < masked_cons || \
size <= ring_size - *masked_prod) { \
memcpy(buf + *masked_prod, opaque, size); \
} else { \
memcpy(buf + *masked_prod, opaque, ring_size - *masked_prod); \
memcpy(buf, (unsigned char *)opaque + (ring_size - *masked_prod), \
size - (ring_size - *masked_prod)); \
} \
*masked_prod = name##_mask(*masked_prod + size, ring_size); \
} \
\
static inline RING_IDX name##_queued(RING_IDX prod, \
RING_IDX cons, \
RING_IDX ring_size) \
{ \
RING_IDX size; \
\
if (prod == cons) \
return 0; \
\
prod = name##_mask(prod, ring_size); \
cons = name##_mask(cons, ring_size); \
\
if (prod == cons) \
return ring_size; \
\
if (prod > cons) \
size = prod - cons; \
else \
size = ring_size - (cons - prod); \
return size; \
} \
\
struct name##_data { \
unsigned char *in; /* half of the allocation */ \
unsigned char *out; /* half of the allocation */ \
}
#define DEFINE_XEN_FLEX_RING_AND_INTF(name) \
struct name##_data_intf { \
RING_IDX in_cons, in_prod; \
\
uint8_t pad1[56]; \
\
RING_IDX out_cons, out_prod; \
\
uint8_t pad2[56]; \
\
RING_IDX ring_order; \
grant_ref_t ref[]; \
}; \
DEFINE_XEN_FLEX_RING(name)
#endif /* __XEN_PUBLIC_IO_RING_H__ */
include/xen/interface/io/sndif.h 0 → 100644
View file @ a9648072
/******************************************************************************
* sndif.h
*
* Unified sound-device I/O interface for Xen guest OSes.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (C) 2013-2015 GlobalLogic Inc.
* Copyright (C) 2016-2017 EPAM Systems Inc.
*
* Authors: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
* Oleksandr Grytsov <oleksandr_grytsov@epam.com>
* Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
* Iurii Konovalenko <iurii.konovalenko@globallogic.com>
*/
#ifndef __XEN_PUBLIC_IO_SNDIF_H__
#define __XEN_PUBLIC_IO_SNDIF_H__
#include "ring.h"
#include "../grant_table.h"
/*
******************************************************************************
* Feature and Parameter Negotiation
******************************************************************************
*
* Front->back notifications: when enqueuing a new request, sending a
* notification can be made conditional on xensnd_req (i.e., the generic
* hold-off mechanism provided by the ring macros). Backends must set
* xensnd_req appropriately (e.g., using RING_FINAL_CHECK_FOR_REQUESTS()).
*
* Back->front notifications: when enqueuing a new response, sending a
* notification can be made conditional on xensnd_resp (i.e., the generic
* hold-off mechanism provided by the ring macros). Frontends must set
* xensnd_resp appropriately (e.g., using RING_FINAL_CHECK_FOR_RESPONSES()).
*
* The two halves of a para-virtual sound card driver utilize nodes within
* XenStore to communicate capabilities and to negotiate operating parameters.
* This section enumerates these nodes which reside in the respective front and
* backend portions of XenStore, following the XenBus convention.
*
* All data in XenStore is stored as strings. Nodes specifying numeric
* values are encoded in decimal. Integer value ranges listed below are
* expressed as fixed sized integer types capable of storing the conversion
* of a properly formated node string, without loss of information.
*
******************************************************************************
* Example configuration
******************************************************************************
*
* Note: depending on the use-case backend can expose more sound cards and
* PCM devices/streams than the underlying HW physically has by employing
* SW mixers, configuring virtual sound streams, channels etc.
*
* This is an example of backend and frontend configuration:
*
*--------------------------------- Backend -----------------------------------
*
* /local/domain/0/backend/vsnd/1/0/frontend-id = "1"
* /local/domain/0/backend/vsnd/1/0/frontend = "/local/domain/1/device/vsnd/0"
* /local/domain/0/backend/vsnd/1/0/state = "4"
* /local/domain/0/backend/vsnd/1/0/versions = "1,2"
*
*--------------------------------- Frontend ----------------------------------
*
* /local/domain/1/device/vsnd/0/backend-id = "0"
* /local/domain/1/device/vsnd/0/backend = "/local/domain/0/backend/vsnd/1/0"
* /local/domain/1/device/vsnd/0/state = "4"
* /local/domain/1/device/vsnd/0/version = "1"
*
*----------------------------- Card configuration ----------------------------
*
* /local/domain/1/device/vsnd/0/short-name = "Card short name"
* /local/domain/1/device/vsnd/0/long-name = "Card long name"
* /local/domain/1/device/vsnd/0/sample-rates = "8000,32000,44100,48000,96000"
* /local/domain/1/device/vsnd/0/sample-formats = "s8,u8,s16_le,s16_be"
* /local/domain/1/device/vsnd/0/buffer-size = "262144"
*
*------------------------------- PCM device 0 --------------------------------
*
* /local/domain/1/device/vsnd/0/0/name = "General analog"
* /local/domain/1/device/vsnd/0/0/channels-max = "5"
*
*----------------------------- Stream 0, playback ----------------------------
*
* /local/domain/1/device/vsnd/0/0/0/type = "p"
* /local/domain/1/device/vsnd/0/0/0/sample-formats = "s8,u8"
* /local/domain/1/device/vsnd/0/0/0/unique-id = "0"
*
* /local/domain/1/device/vsnd/0/0/0/ring-ref = "386"
* /local/domain/1/device/vsnd/0/0/0/event-channel = "15"
*
*------------------------------ Stream 1, capture ----------------------------
*
* /local/domain/1/device/vsnd/0/0/1/type = "c"
* /local/domain/1/device/vsnd/0/0/1/channels-max = "2"
* /local/domain/1/device/vsnd/0/0/1/unique-id = "1"
*
* /local/domain/1/device/vsnd/0/0/1/ring-ref = "384"
* /local/domain/1/device/vsnd/0/0/1/event-channel = "13"
*
*------------------------------- PCM device 1 --------------------------------
*
* /local/domain/1/device/vsnd/0/1/name = "HDMI-0"
* /local/domain/1/device/vsnd/0/1/sample-rates = "8000,32000,44100"
*
*------------------------------ Stream 0, capture ----------------------------
*
* /local/domain/1/device/vsnd/0/1/0/type = "c"
* /local/domain/1/device/vsnd/0/1/0/unique-id = "2"
*
* /local/domain/1/device/vsnd/0/1/0/ring-ref = "387"
* /local/domain/1/device/vsnd/0/1/0/event-channel = "151"
*
*------------------------------- PCM device 2 --------------------------------
*
* /local/domain/1/device/vsnd/0/2/name = "SPDIF"
*
*----------------------------- Stream 0, playback ----------------------------
*
* /local/domain/1/device/vsnd/0/2/0/type = "p"
* /local/domain/1/device/vsnd/0/2/0/unique-id = "3"
*
* /local/domain/1/device/vsnd/0/2/0/ring-ref = "389"
* /local/domain/1/device/vsnd/0/2/0/event-channel = "152"
*
******************************************************************************
* Backend XenBus Nodes
******************************************************************************
*
*----------------------------- Protocol version ------------------------------
*
* versions
* Values: <string>
*
* List of XENSND_LIST_SEPARATOR separated protocol versions supported
* by the backend. For example "1,2,3".
*
******************************************************************************
* Frontend XenBus Nodes
******************************************************************************
*
*-------------------------------- Addressing ---------------------------------
*
* dom-id
* Values: <uint16_t>
*
* Domain identifier.
*
* dev-id
* Values: <uint16_t>
*
* Device identifier.
*
* pcm-dev-idx
* Values: <uint8_t>
*
* Zero based contigous index of the PCM device.
*
* stream-idx
* Values: <uint8_t>
*
* Zero based contigous index of the stream of the PCM device.
*
* The following pattern is used for addressing:
* /local/domain/<dom-id>/device/vsnd/<dev-id>/<pcm-dev-idx>/<stream-idx>/...
*
*----------------------------- Protocol version ------------------------------
*
* version
* Values: <string>
*
* Protocol version, chosen among the ones supported by the backend.
*
*------------------------------- PCM settings --------------------------------
*
* Every virtualized sound frontend has a set of PCM devices and streams, each
* could be individually configured. Part of the PCM configuration can be
* defined at higher level of the hierarchy and be fully or partially re-used
* by the underlying layers. These configuration values are:
* o number of channels (min/max)
* o supported sample rates
* o supported sample formats.
* E.g. one can define these values for the whole card, device or stream.
* Every underlying layer in turn can re-define some or all of them to better
* fit its needs. For example, card may define number of channels to be
* in [1; 8] range, and some particular stream may be limited to [1; 2] only.
* The rule is that the underlying layer must be a subset of the upper layer
* range.
*
* channels-min
* Values: <uint8_t>
*
* The minimum amount of channels that is supported, [1; channels-max].
* Optional, if not set or omitted a value of 1 is used.
*
* channels-max
* Values: <uint8_t>
*
* The maximum amount of channels that is supported.
* Must be at least <channels-min>.
*
* sample-rates
* Values: <list of uint32_t>
*
* List of supported sample rates separated by XENSND_LIST_SEPARATOR.
* Sample rates are expressed as a list of decimal values w/o any
* ordering requirement.
*
* sample-formats
* Values: <list of XENSND_PCM_FORMAT_XXX_STR>
*
* List of supported sample formats separated by XENSND_LIST_SEPARATOR.
* Items must not exceed XENSND_SAMPLE_FORMAT_MAX_LEN length.
*
* buffer-size
* Values: <uint32_t>
*
* The maximum size in octets of the buffer to allocate per stream.
*
*----------------------- Virtual sound card settings -------------------------
* short-name
* Values: <char[32]>
*
* Short name of the virtual sound card. Optional.
*
* long-name
* Values: <char[80]>
*
* Long name of the virtual sound card. Optional.
*
*----------------------------- Device settings -------------------------------
* name
* Values: <char[80]>
*
* Name of the sound device within the virtual sound card. Optional.
*
*----------------------------- Stream settings -------------------------------
*
* type
* Values: "p", "c"
*
* Stream type: "p" - playback stream, "c" - capture stream
*
* If both capture and playback are needed then two streams need to be
* defined under the same device.
*
* unique-id
* Values: <uint32_t>
*
* After stream initialization it is assigned a unique ID (within the front
* driver), so every stream of the frontend can be identified by the
* backend by this ID. This is not equal to stream-idx as the later is
* zero based within the device, but this index is contigous within the
* driver.
*
*-------------------- Stream Request Transport Parameters --------------------
*
* event-channel
* Values: <uint32_t>
*
* The identifier of the Xen event channel used to signal activity
* in the ring buffer.
*
* ring-ref
* Values: <uint32_t>
*
* The Xen grant reference granting permission for the backend to map
* a sole page in a single page sized ring buffer.
*
******************************************************************************
* STATE DIAGRAMS
******************************************************************************
*
* Tool stack creates front and back state nodes with initial state
* XenbusStateInitialising.
* Tool stack creates and sets up frontend sound configuration nodes per domain.
*
* Front Back
* ================================= =====================================
* XenbusStateInitialising XenbusStateInitialising
* o Query backend device identification
* data.
* o Open and validate backend device.
* |
* |
* V
* XenbusStateInitWait
*
* o Query frontend configuration
* o Allocate and initialize
* event channels per configured
* playback/capture stream.
* o Publish transport parameters
* that will be in effect during
* this connection.
* |
* |
* V
* XenbusStateInitialised
*
* o Query frontend transport parameters.
* o Connect to the event channels.
* |
* |
* V
* XenbusStateConnected
*
* o Create and initialize OS
* virtual sound device instances
* as per configuration.
* |
* |
* V
* XenbusStateConnected
*
* XenbusStateUnknown
* XenbusStateClosed
* XenbusStateClosing
* o Remove virtual sound device
* o Remove event channels
* |
* |
* V
* XenbusStateClosed
*
*------------------------------- Recovery flow -------------------------------
*
* In case of frontend unrecoverable errors backend handles that as
* if frontend goes into the XenbusStateClosed state.
*
* In case of backend unrecoverable errors frontend tries removing
* the virtualized device. If this is possible at the moment of error,
* then frontend goes into the XenbusStateInitialising state and is ready for
* new connection with backend. If the virtualized device is still in use and
* cannot be removed, then frontend goes into the XenbusStateReconfiguring state
* until either the virtualized device removed or backend initiates a new
* connection. On the virtualized device removal frontend goes into the
* XenbusStateInitialising state.
*
* Note on XenbusStateReconfiguring state of the frontend: if backend has
* unrecoverable errors then frontend cannot send requests to the backend
* and thus cannot provide functionality of the virtualized device anymore.
* After backend is back to normal the virtualized device may still hold some
* state: configuration in use, allocated buffers, client application state etc.
* So, in most cases, this will require frontend to implement complex recovery
* reconnect logic. Instead, by going into XenbusStateReconfiguring state,
* frontend will make sure no new clients of the virtualized device are
* accepted, allow existing client(s) to exit gracefully by signaling error
* state etc.
* Once all the clients are gone frontend can reinitialize the virtualized
* device and get into XenbusStateInitialising state again signaling the
* backend that a new connection can be made.
*
* There are multiple conditions possible under which frontend will go from
* XenbusStateReconfiguring into XenbusStateInitialising, some of them are OS
* specific. For example:
* 1. The underlying OS framework may provide callbacks to signal that the last
* client of the virtualized device has gone and the device can be removed
* 2. Frontend can schedule a deferred work (timer/tasklet/workqueue)
* to periodically check if this is the right time to re-try removal of
* the virtualized device.
* 3. By any other means.
*
******************************************************************************
* PCM FORMATS
******************************************************************************
*
* XENSND_PCM_FORMAT_<format>[_<endian>]
*
* format: <S/U/F><bits> or <name>
* S - signed, U - unsigned, F - float
* bits - 8, 16, 24, 32
* name - MU_LAW, GSM, etc.
*
* endian: <LE/BE>, may be absent
* LE - Little endian, BE - Big endian
*/
#define XENSND_PCM_FORMAT_S8 0
#define XENSND_PCM_FORMAT_U8 1
#define XENSND_PCM_FORMAT_S16_LE 2
#define XENSND_PCM_FORMAT_S16_BE 3
#define XENSND_PCM_FORMAT_U16_LE 4
#define XENSND_PCM_FORMAT_U16_BE 5
#define XENSND_PCM_FORMAT_S24_LE 6
#define XENSND_PCM_FORMAT_S24_BE 7
#define XENSND_PCM_FORMAT_U24_LE 8
#define XENSND_PCM_FORMAT_U24_BE 9
#define XENSND_PCM_FORMAT_S32_LE 10
#define XENSND_PCM_FORMAT_S32_BE 11
#define XENSND_PCM_FORMAT_U32_LE 12
#define XENSND_PCM_FORMAT_U32_BE 13
#define XENSND_PCM_FORMAT_F32_LE 14 /* 4-byte float, IEEE-754 32-bit, */
#define XENSND_PCM_FORMAT_F32_BE 15 /* range -1.0 to 1.0 */
#define XENSND_PCM_FORMAT_F64_LE 16 /* 8-byte float, IEEE-754 64-bit, */
#define XENSND_PCM_FORMAT_F64_BE 17 /* range -1.0 to 1.0 */
#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE 18
#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE 19
#define XENSND_PCM_FORMAT_MU_LAW 20
#define XENSND_PCM_FORMAT_A_LAW 21
#define XENSND_PCM_FORMAT_IMA_ADPCM 22
#define XENSND_PCM_FORMAT_MPEG 23
#define XENSND_PCM_FORMAT_GSM 24
/*
******************************************************************************
* REQUEST CODES
******************************************************************************
*/
#define XENSND_OP_OPEN 0
#define XENSND_OP_CLOSE 1
#define XENSND_OP_READ 2
#define XENSND_OP_WRITE 3
#define XENSND_OP_SET_VOLUME 4
#define XENSND_OP_GET_VOLUME 5
#define XENSND_OP_MUTE 6
#define XENSND_OP_UNMUTE 7
/*
******************************************************************************
* XENSTORE FIELD AND PATH NAME STRINGS, HELPERS
******************************************************************************
*/
#define XENSND_DRIVER_NAME "vsnd"
#define XENSND_LIST_SEPARATOR ","
/* Field names */
#define XENSND_FIELD_BE_VERSIONS "versions"
#define XENSND_FIELD_FE_VERSION "version"
#define XENSND_FIELD_VCARD_SHORT_NAME "short-name"
#define XENSND_FIELD_VCARD_LONG_NAME "long-name"
#define XENSND_FIELD_RING_REF "ring-ref"
#define XENSND_FIELD_EVT_CHNL "event-channel"
#define XENSND_FIELD_DEVICE_NAME "name"
#define XENSND_FIELD_TYPE "type"
#define XENSND_FIELD_STREAM_UNIQUE_ID "unique-id"
#define XENSND_FIELD_CHANNELS_MIN "channels-min"
#define XENSND_FIELD_CHANNELS_MAX "channels-max"
#define XENSND_FIELD_SAMPLE_RATES "sample-rates"
#define XENSND_FIELD_SAMPLE_FORMATS "sample-formats"
#define XENSND_FIELD_BUFFER_SIZE "buffer-size"
/* Stream type field values. */
#define XENSND_STREAM_TYPE_PLAYBACK "p"
#define XENSND_STREAM_TYPE_CAPTURE "c"
/* Sample rate max string length */
#define XENSND_SAMPLE_RATE_MAX_LEN 11
/* Sample format field values */
#define XENSND_SAMPLE_FORMAT_MAX_LEN 24
#define XENSND_PCM_FORMAT_S8_STR "s8"
#define XENSND_PCM_FORMAT_U8_STR "u8"
#define XENSND_PCM_FORMAT_S16_LE_STR "s16_le"
#define XENSND_PCM_FORMAT_S16_BE_STR "s16_be"
#define XENSND_PCM_FORMAT_U16_LE_STR "u16_le"
#define XENSND_PCM_FORMAT_U16_BE_STR "u16_be"
#define XENSND_PCM_FORMAT_S24_LE_STR "s24_le"
#define XENSND_PCM_FORMAT_S24_BE_STR "s24_be"
#define XENSND_PCM_FORMAT_U24_LE_STR "u24_le"
#define XENSND_PCM_FORMAT_U24_BE_STR "u24_be"
#define XENSND_PCM_FORMAT_S32_LE_STR "s32_le"
#define XENSND_PCM_FORMAT_S32_BE_STR "s32_be"
#define XENSND_PCM_FORMAT_U32_LE_STR "u32_le"
#define XENSND_PCM_FORMAT_U32_BE_STR "u32_be"
#define XENSND_PCM_FORMAT_F32_LE_STR "float_le"
#define XENSND_PCM_FORMAT_F32_BE_STR "float_be"
#define XENSND_PCM_FORMAT_F64_LE_STR "float64_le"
#define XENSND_PCM_FORMAT_F64_BE_STR "float64_be"
#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE_STR "iec958_subframe_le"
#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE_STR "iec958_subframe_be"
#define XENSND_PCM_FORMAT_MU_LAW_STR "mu_law"
#define XENSND_PCM_FORMAT_A_LAW_STR "a_law"
#define XENSND_PCM_FORMAT_IMA_ADPCM_STR "ima_adpcm"
#define XENSND_PCM_FORMAT_MPEG_STR "mpeg"
#define XENSND_PCM_FORMAT_GSM_STR "gsm"
/*
******************************************************************************
* STATUS RETURN CODES
******************************************************************************
*
* Status return code is zero on success and -XEN_EXX on failure.
*
******************************************************************************
* Assumptions
******************************************************************************
* o usage of grant reference 0 as invalid grant reference:
* grant reference 0 is valid, but never exposed to a PV driver,
* because of the fact it is already in use/reserved by the PV console.
* o all references in this document to page sizes must be treated
* as pages of size XEN_PAGE_SIZE unless otherwise noted.
*
******************************************************************************
* Description of the protocol between frontend and backend driver
******************************************************************************
*
* The two halves of a Para-virtual sound driver communicate with
* each other using shared pages and event channels.
* Shared page contains a ring with request/response packets.
*
* Packets, used for input/output operations, e.g. read/write, set/get volume,
* etc., provide offset/length fields in order to allow asynchronous protocol
* operation with buffer space sharing: part of the buffer allocated at
* XENSND_OP_OPEN can be used for audio samples and part, for example,
* for volume control.
*
* All reserved fields in the structures below must be 0.
*
*---------------------------------- Requests ---------------------------------
*
* All request packets have the same length (32 octets)
* All request packets have common header:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | operation | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* id - uint16_t, private guest value, echoed in response
* operation - uint8_t, operation code, XENSND_OP_???
*
* For all packets which use offset and length:
* offset - uint32_t, read or write data offset within the shared buffer,
* passed with XENSND_OP_OPEN request, octets,
* [0; XENSND_OP_OPEN.buffer_sz - 1].
* length - uint32_t, read or write data length, octets
*
* Request open - open a PCM stream for playback or capture:
*
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | XENSND_OP_OPEN | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | pcm_rate | 12
* +----------------+----------------+----------------+----------------+
* | pcm_format | pcm_channels | reserved | 16
* +----------------+----------------+----------------+----------------+
* | buffer_sz | 20
* +----------------+----------------+----------------+----------------+
* | gref_directory | 24
* +----------------+----------------+----------------+----------------+
* | reserved | 28
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 32
* +----------------+----------------+----------------+----------------+
*
* pcm_rate - uint32_t, stream data rate, Hz
* pcm_format - uint8_t, XENSND_PCM_FORMAT_XXX value
* pcm_channels - uint8_t, number of channels of this stream,
* [channels-min; channels-max]
* buffer_sz - uint32_t, buffer size to be allocated, octets
* gref_directory - grant_ref_t, a reference to the first shared page
* describing shared buffer references. At least one page exists. If shared
* buffer size (buffer_sz) exceeds what can be addressed by this single page,
* then reference to the next page must be supplied (see gref_dir_next_page
* below)
*/
struct xensnd_open_req {
uint32_t pcm_rate;
uint8_t pcm_format;
uint8_t pcm_channels;
uint16_t reserved;
uint32_t buffer_sz;
grant_ref_t gref_directory;
};
/*
* Shared page for XENSND_OP_OPEN buffer descriptor (gref_directory in the
* request) employs a list of pages, describing all pages of the shared data
* buffer:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | gref_dir_next_page | 4
* +----------------+----------------+----------------+----------------+
* | gref[0] | 8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | gref[i] | i*4+8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | gref[N - 1] | N*4+8
* +----------------+----------------+----------------+----------------+
*
* gref_dir_next_page - grant_ref_t, reference to the next page describing
* page directory. Must be 0 if there are no more pages in the list.
* gref[i] - grant_ref_t, reference to a shared page of the buffer
* allocated at XENSND_OP_OPEN
*
* Number of grant_ref_t entries in the whole page directory is not
* passed, but instead can be calculated as:
* num_grefs_total = (XENSND_OP_OPEN.buffer_sz + XEN_PAGE_SIZE - 1) /
* XEN_PAGE_SIZE
*/
struct xensnd_page_directory {
grant_ref_t gref_dir_next_page;
grant_ref_t gref[1]; /* Variable length */
};
/*
* Request close - close an opened pcm stream:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | XENSND_OP_CLOSE| reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 32
* +----------------+----------------+----------------+----------------+
*
* Request read/write - used for read (for capture) or write (for playback):
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | operation | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | offset | 12
* +----------------+----------------+----------------+----------------+
* | length | 16
* +----------------+----------------+----------------+----------------+
* | reserved | 20
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 32
* +----------------+----------------+----------------+----------------+
*
* operation - XENSND_OP_READ for read or XENSND_OP_WRITE for write
*/
struct xensnd_rw_req {
uint32_t offset;
uint32_t length;
};
/*
* Request set/get volume - set/get channels' volume of the stream given:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | operation | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | offset | 12
* +----------------+----------------+----------------+----------------+
* | length | 16
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 32
* +----------------+----------------+----------------+----------------+
*
* operation - XENSND_OP_SET_VOLUME for volume set
* or XENSND_OP_GET_VOLUME for volume get
* Buffer passed with XENSND_OP_OPEN is used to exchange volume
* values:
*
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | channel[0] | 4
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | channel[i] | i*4
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | channel[N - 1] | (N-1)*4
* +----------------+----------------+----------------+----------------+
*
* N = XENSND_OP_OPEN.pcm_channels
* i - uint8_t, index of a channel
* channel[i] - sint32_t, volume of i-th channel
* Volume is expressed as a signed value in steps of 0.001 dB,
* while 0 being 0 dB.
*
* Request mute/unmute - mute/unmute stream:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | operation | reserved | 4
* +----------------+----------------+----------------+----------------+
* | reserved | 8
* +----------------+----------------+----------------+----------------+
* | offset | 12
* +----------------+----------------+----------------+----------------+
* | length | 16
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 32
* +----------------+----------------+----------------+----------------+
*
* operation - XENSND_OP_MUTE for mute or XENSND_OP_UNMUTE for unmute
* Buffer passed with XENSND_OP_OPEN is used to exchange mute/unmute
* values:
*
* 0 octet
* +----------------+----------------+----------------+----------------+
* | channel[0] | 4
* +----------------+----------------+----------------+----------------+
* +/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | channel[i] | i*4
* +----------------+----------------+----------------+----------------+
* +/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | channel[N - 1] | (N-1)*4
* +----------------+----------------+----------------+----------------+
*
* N = XENSND_OP_OPEN.pcm_channels
* i - uint8_t, index of a channel
* channel[i] - uint8_t, non-zero if i-th channel needs to be muted/unmuted
*
*------------------------------------ N.B. -----------------------------------
*
* The 'struct xensnd_rw_req' is also used for XENSND_OP_SET_VOLUME,
* XENSND_OP_GET_VOLUME, XENSND_OP_MUTE, XENSND_OP_UNMUTE.
*/
/*
*---------------------------------- Responses --------------------------------
*
* All response packets have the same length (32 octets)
*
* Response for all requests:
* 0 1 2 3 octet
* +----------------+----------------+----------------+----------------+
* | id | operation | reserved | 4
* +----------------+----------------+----------------+----------------+
* | status | 8
* +----------------+----------------+----------------+----------------+
* | reserved | 12
* +----------------+----------------+----------------+----------------+
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
* +----------------+----------------+----------------+----------------+
* | reserved | 32
* +----------------+----------------+----------------+----------------+
*
* id - uint16_t, copied from the request
* operation - uint8_t, XENSND_OP_* - copied from request
* status - int32_t, response status, zero on success and -XEN_EXX on failure
*/
struct xensnd_req {
uint16_t id;
uint8_t operation;
uint8_t reserved[5];
union {
struct xensnd_open_req open;
struct xensnd_rw_req rw;
uint8_t reserved[24];
} op;
};
struct xensnd_resp {
uint16_t id;
uint8_t operation;
uint8_t reserved;
int32_t status;
uint8_t reserved1[24];
};
DEFINE_RING_TYPES(xen_sndif, struct xensnd_req, struct xensnd_resp);
#endif /* __XEN_PUBLIC_IO_SNDIF_H__ */
include/xen/xen-ops.h
View file @ a9648072
......@@ -22,6 +22,8 @@ void xen_timer_resume(void);
void xen_arch_resume(void);
void xen_arch_suspend(void);
void xen_reboot(int reason);
void xen_resume_notifier_register(struct notifier_block *nb);
void xen_resume_notifier_unregister(struct notifier_block *nb);
......@@ -34,11 +36,25 @@ u64 xen_steal_clock(int cpu);
int xen_setup_shutdown_event(void);
extern unsigned long *xen_contiguous_bitmap;
#ifdef CONFIG_XEN_PV
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle);
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
#else
static inline int xen_create_contiguous_region(phys_addr_t pstart,
unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
return 0;
}
static inline void xen_destroy_contiguous_region(phys_addr_t pstart,
unsigned int order) { }
#endif
struct vm_area_struct;
......@@ -120,6 +136,9 @@ efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
unsigned long count, u64 *max_size,
int *reset_type);
void xen_efi_reset_system(int reset_type, efi_status_t status,
unsigned long data_size, efi_char16_t *data);
#ifdef CONFIG_PREEMPT
......
net/9p/Kconfig
View file @ a9648072
......@@ -22,6 +22,15 @@ config NET_9P_VIRTIO
This builds support for a transports between
guest partitions and a host partition.
config NET_9P_XEN
depends on XEN
select XEN_XENBUS_FRONTEND
tristate "9P Xen Transport"
help
This builds support for a transport for 9pfs between
two Xen domains.
config NET_9P_RDMA
depends on INET && INFINIBAND && INFINIBAND_ADDR_TRANS
tristate "9P RDMA Transport (Experimental)"
......
net/9p/Makefile
View file @ a9648072
obj-$(CONFIG_NET_9P) := 9pnet.o
obj-$(CONFIG_NET_9P_XEN) += 9pnet_xen.o
obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
......@@ -14,5 +15,8 @@ obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
9pnet_virtio-objs := \
trans_virtio.o \
9pnet_xen-objs := \
trans_xen.o \
9pnet_rdma-objs := \
trans_rdma.o \
net/9p/trans_xen.c 0 → 100644
View file @ a9648072
/*
* linux/fs/9p/trans_xen
*
* Xen transport layer.
*
* Copyright (C) 2017 by Stefano Stabellini <stefano@aporeto.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <xen/events.h>
#include <xen/grant_table.h>
#include <xen/xen.h>
#include <xen/xenbus.h>
#include <xen/interface/io/9pfs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/rwlock.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
#define XEN_9PFS_NUM_RINGS 2
#define XEN_9PFS_RING_ORDER 6
#define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
struct xen_9pfs_header {
uint32_t size;
uint8_t id;
uint16_t tag;
/* uint8_t sdata[]; */
} __attribute__((packed));
/* One per ring, more than one per 9pfs share */
struct xen_9pfs_dataring {
struct xen_9pfs_front_priv *priv;
struct xen_9pfs_data_intf *intf;
grant_ref_t ref;
int evtchn;
int irq;
/* protect a ring from concurrent accesses */
spinlock_t lock;
struct xen_9pfs_data data;
wait_queue_head_t wq;
struct work_struct work;
};
/* One per 9pfs share */
struct xen_9pfs_front_priv {
struct list_head list;
struct xenbus_device *dev;
char *tag;
struct p9_client *client;
int num_rings;
struct xen_9pfs_dataring *rings;
};
static LIST_HEAD(xen_9pfs_devs);
static DEFINE_RWLOCK(xen_9pfs_lock);
/* We don't currently allow canceling of requests */
static int p9_xen_cancel(struct p9_client *client, struct p9_req_t *req)
{
return 1;
}
static int p9_xen_create(struct p9_client *client, const char *addr, char *args)
{
struct xen_9pfs_front_priv *priv;
read_lock(&xen_9pfs_lock);
list_for_each_entry(priv, &xen_9pfs_devs, list) {
if (!strcmp(priv->tag, addr)) {
priv->client = client;
read_unlock(&xen_9pfs_lock);
return 0;
}
}
read_unlock(&xen_9pfs_lock);
return -EINVAL;
}
static void p9_xen_close(struct p9_client *client)
{
struct xen_9pfs_front_priv *priv;
read_lock(&xen_9pfs_lock);
list_for_each_entry(priv, &xen_9pfs_devs, list) {
if (priv->client == client) {
priv->client = NULL;
read_unlock(&xen_9pfs_lock);
return;
}
}
read_unlock(&xen_9pfs_lock);
}
static bool p9_xen_write_todo(struct xen_9pfs_dataring *ring, RING_IDX size)
{
RING_IDX cons, prod;
cons = ring->intf->out_cons;
prod = ring->intf->out_prod;
virt_mb();
return XEN_9PFS_RING_SIZE -
xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) >= size;
}
static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
{
struct xen_9pfs_front_priv *priv = NULL;
RING_IDX cons, prod, masked_cons, masked_prod;
unsigned long flags;
u32 size = p9_req->tc->size;
struct xen_9pfs_dataring *ring;
int num;
read_lock(&xen_9pfs_lock);
list_for_each_entry(priv, &xen_9pfs_devs, list) {
if (priv->client == client)
break;
}
read_unlock(&xen_9pfs_lock);
if (!priv || priv->client != client)
return -EINVAL;
num = p9_req->tc->tag % priv->num_rings;
ring = &priv->rings[num];
again:
while (wait_event_interruptible(ring->wq,
p9_xen_write_todo(ring, size)) != 0)
;
spin_lock_irqsave(&ring->lock, flags);
cons = ring->intf->out_cons;
prod = ring->intf->out_prod;
virt_mb();
if (XEN_9PFS_RING_SIZE - xen_9pfs_queued(prod, cons,
XEN_9PFS_RING_SIZE) < size) {
spin_unlock_irqrestore(&ring->lock, flags);
goto again;
}
masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
xen_9pfs_write_packet(ring->data.out, p9_req->tc->sdata, size,
&masked_prod, masked_cons, XEN_9PFS_RING_SIZE);
p9_req->status = REQ_STATUS_SENT;
virt_wmb(); /* write ring before updating pointer */
prod += size;
ring->intf->out_prod = prod;
spin_unlock_irqrestore(&ring->lock, flags);
notify_remote_via_irq(ring->irq);
return 0;
}
static void p9_xen_response(struct work_struct *work)
{
struct xen_9pfs_front_priv *priv;
struct xen_9pfs_dataring *ring;
RING_IDX cons, prod, masked_cons, masked_prod;
struct xen_9pfs_header h;
struct p9_req_t *req;
int status;
ring = container_of(work, struct xen_9pfs_dataring, work);
priv = ring->priv;
while (1) {
cons = ring->intf->in_cons;
prod = ring->intf->in_prod;
virt_rmb();
if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) <
sizeof(h)) {
notify_remote_via_irq(ring->irq);
return;
}
masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
/* First, read just the header */
xen_9pfs_read_packet(&h, ring->data.in, sizeof(h),
masked_prod, &masked_cons,
XEN_9PFS_RING_SIZE);
req = p9_tag_lookup(priv->client, h.tag);
if (!req || req->status != REQ_STATUS_SENT) {
dev_warn(&priv->dev->dev, "Wrong req tag=%x\n", h.tag);
cons += h.size;
virt_mb();
ring->intf->in_cons = cons;
continue;
}
memcpy(req->rc, &h, sizeof(h));
req->rc->offset = 0;
masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
/* Then, read the whole packet (including the header) */
xen_9pfs_read_packet(req->rc->sdata, ring->data.in, h.size,
masked_prod, &masked_cons,
XEN_9PFS_RING_SIZE);
virt_mb();
cons += h.size;
ring->intf->in_cons = cons;
status = (req->status != REQ_STATUS_ERROR) ?
REQ_STATUS_RCVD : REQ_STATUS_ERROR;
p9_client_cb(priv->client, req, status);
}
}
static irqreturn_t xen_9pfs_front_event_handler(int irq, void *r)
{
struct xen_9pfs_dataring *ring = r;
if (!ring || !ring->priv->client) {
/* ignore spurious interrupt */
return IRQ_HANDLED;
}
wake_up_interruptible(&ring->wq);
schedule_work(&ring->work);
return IRQ_HANDLED;
}
static struct p9_trans_module p9_xen_trans = {
.name = "xen",
.maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT),
.def = 1,
.create = p9_xen_create,
.close = p9_xen_close,
.request = p9_xen_request,
.cancel = p9_xen_cancel,
.owner = THIS_MODULE,
};
static const struct xenbus_device_id xen_9pfs_front_ids[] = {
{ "9pfs" },
{ "" }
};
static void xen_9pfs_front_free(struct xen_9pfs_front_priv *priv)
{
int i, j;
write_lock(&xen_9pfs_lock);
list_del(&priv->list);
write_unlock(&xen_9pfs_lock);
for (i = 0; i < priv->num_rings; i++) {
if (!priv->rings[i].intf)
break;
if (priv->rings[i].irq > 0)
unbind_from_irqhandler(priv->rings[i].irq, priv->dev);
if (priv->rings[i].data.in) {
for (j = 0; j < (1 << XEN_9PFS_RING_ORDER); j++) {
grant_ref_t ref;
ref = priv->rings[i].intf->ref[j];
gnttab_end_foreign_access(ref, 0, 0);
}
free_pages((unsigned long)priv->rings[i].data.in,
XEN_9PFS_RING_ORDER -
(PAGE_SHIFT - XEN_PAGE_SHIFT));
}
gnttab_end_foreign_access(priv->rings[i].ref, 0, 0);
free_page((unsigned long)priv->rings[i].intf);
}
kfree(priv->rings);
kfree(priv->tag);
kfree(priv);
}
static int xen_9pfs_front_remove(struct xenbus_device *dev)
{
struct xen_9pfs_front_priv *priv = dev_get_drvdata(&dev->dev);
dev_set_drvdata(&dev->dev, NULL);
xen_9pfs_front_free(priv);
return 0;
}
static int xen_9pfs_front_alloc_dataring(struct xenbus_device *dev,
struct xen_9pfs_dataring *ring)
{
int i = 0;
int ret = -ENOMEM;
void *bytes = NULL;
init_waitqueue_head(&ring->wq);
spin_lock_init(&ring->lock);
INIT_WORK(&ring->work, p9_xen_response);
ring->intf = (struct xen_9pfs_data_intf *)get_zeroed_page(GFP_KERNEL);
if (!ring->intf)
return ret;
ret = gnttab_grant_foreign_access(dev->otherend_id,
virt_to_gfn(ring->intf), 0);
if (ret < 0)
goto out;
ring->ref = ret;
bytes = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
XEN_9PFS_RING_ORDER - (PAGE_SHIFT - XEN_PAGE_SHIFT));
if (!bytes) {
ret = -ENOMEM;
goto out;
}
for (; i < (1 << XEN_9PFS_RING_ORDER); i++) {
ret = gnttab_grant_foreign_access(
dev->otherend_id, virt_to_gfn(bytes) + i, 0);
if (ret < 0)
goto out;
ring->intf->ref[i] = ret;
}
ring->intf->ring_order = XEN_9PFS_RING_ORDER;
ring->data.in = bytes;
ring->data.out = bytes + XEN_9PFS_RING_SIZE;
ret = xenbus_alloc_evtchn(dev, &ring->evtchn);
if (ret)
goto out;
ring->irq = bind_evtchn_to_irqhandler(ring->evtchn,
xen_9pfs_front_event_handler,
0, "xen_9pfs-frontend", ring);
if (ring->irq >= 0)
return 0;
xenbus_free_evtchn(dev, ring->evtchn);
ret = ring->irq;
out:
if (bytes) {
for (i--; i >= 0; i--)
gnttab_end_foreign_access(ring->intf->ref[i], 0, 0);
free_pages((unsigned long)bytes,
XEN_9PFS_RING_ORDER -
(PAGE_SHIFT - XEN_PAGE_SHIFT));
}
gnttab_end_foreign_access(ring->ref, 0, 0);
free_page((unsigned long)ring->intf);
return ret;
}
static int xen_9pfs_front_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int ret, i;
struct xenbus_transaction xbt;
struct xen_9pfs_front_priv *priv = NULL;
char *versions;
unsigned int max_rings, max_ring_order, len = 0;
versions = xenbus_read(XBT_NIL, dev->otherend, "versions", &len);
if (!len)
return -EINVAL;
if (strcmp(versions, "1")) {
kfree(versions);
return -EINVAL;
}
kfree(versions);
max_rings = xenbus_read_unsigned(dev->otherend, "max-rings", 0);
if (max_rings < XEN_9PFS_NUM_RINGS)
return -EINVAL;
max_ring_order = xenbus_read_unsigned(dev->otherend,
"max-ring-page-order", 0);
if (max_ring_order < XEN_9PFS_RING_ORDER)
return -EINVAL;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = dev;
priv->num_rings = XEN_9PFS_NUM_RINGS;
priv->rings = kcalloc(priv->num_rings, sizeof(*priv->rings),
GFP_KERNEL);
if (!priv->rings) {
kfree(priv);
return -ENOMEM;
}
for (i = 0; i < priv->num_rings; i++) {
priv->rings[i].priv = priv;
ret = xen_9pfs_front_alloc_dataring(dev, &priv->rings[i]);
if (ret < 0)
goto error;
}
again:
ret = xenbus_transaction_start(&xbt);
if (ret) {
xenbus_dev_fatal(dev, ret, "starting transaction");
goto error;
}
ret = xenbus_printf(xbt, dev->nodename, "version", "%u", 1);
if (ret)
goto error_xenbus;
ret = xenbus_printf(xbt, dev->nodename, "num-rings", "%u",
priv->num_rings);
if (ret)
goto error_xenbus;
for (i = 0; i < priv->num_rings; i++) {
char str[16];
BUILD_BUG_ON(XEN_9PFS_NUM_RINGS > 9);
sprintf(str, "ring-ref%u", i);
ret = xenbus_printf(xbt, dev->nodename, str, "%d",
priv->rings[i].ref);
if (ret)
goto error_xenbus;
sprintf(str, "event-channel-%u", i);
ret = xenbus_printf(xbt, dev->nodename, str, "%u",
priv->rings[i].evtchn);
if (ret)
goto error_xenbus;
}
priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL);
if (!priv->tag) {
ret = -EINVAL;
goto error_xenbus;
}
ret = xenbus_transaction_end(xbt, 0);
if (ret) {
if (ret == -EAGAIN)
goto again;
xenbus_dev_fatal(dev, ret, "completing transaction");
goto error;
}
write_lock(&xen_9pfs_lock);
list_add_tail(&priv->list, &xen_9pfs_devs);
write_unlock(&xen_9pfs_lock);
dev_set_drvdata(&dev->dev, priv);
xenbus_switch_state(dev, XenbusStateInitialised);
return 0;
error_xenbus:
xenbus_transaction_end(xbt, 1);
xenbus_dev_fatal(dev, ret, "writing xenstore");
error:
dev_set_drvdata(&dev->dev, NULL);
xen_9pfs_front_free(priv);
return ret;
}
static int xen_9pfs_front_resume(struct xenbus_device *dev)
{
dev_warn(&dev->dev, "suspsend/resume unsupported\n");
return 0;
}
static void xen_9pfs_front_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
switch (backend_state) {
case XenbusStateReconfiguring:
case XenbusStateReconfigured:
case XenbusStateInitialising:
case XenbusStateInitialised:
case XenbusStateUnknown:
break;
case XenbusStateInitWait:
break;
case XenbusStateConnected:
xenbus_switch_state(dev, XenbusStateConnected);
break;
case XenbusStateClosed:
if (dev->state == XenbusStateClosed)
break;
/* Missed the backend's CLOSING state -- fallthrough */
case XenbusStateClosing:
xenbus_frontend_closed(dev);
break;
}
}
static struct xenbus_driver xen_9pfs_front_driver = {
.ids = xen_9pfs_front_ids,
.probe = xen_9pfs_front_probe,
.remove = xen_9pfs_front_remove,
.resume = xen_9pfs_front_resume,
.otherend_changed = xen_9pfs_front_changed,
};
int p9_trans_xen_init(void)
{
if (!xen_domain())
return -ENODEV;
pr_info("Initialising Xen transport for 9pfs\n");
v9fs_register_trans(&p9_xen_trans);
return xenbus_register_frontend(&xen_9pfs_front_driver);
}
module_init(p9_trans_xen_init);
void p9_trans_xen_exit(void)
{
v9fs_unregister_trans(&p9_xen_trans);
return xenbus_unregister_driver(&xen_9pfs_front_driver);
}
module_exit(p9_trans_xen_exit);
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7