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Commit 89caf575 authored by Linus Torvalds's avatar Linus Torvalds
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Merge tag 'x86_urgent_for_v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Borislav Petkov:

 - Update the 'mitigations=' kernel param documentation

 - Check the IBPB feature flag before enabling IBPB in firmware calls
   because cloud vendors' fantasy when it comes to creating guest
   configurations is unlimited

 - Unexport sev_es_ghcb_hv_call() before 5.19 releases now that HyperV
   doesn't need it anymore

 - Remove dead CONFIG_* items

* tag 'x86_urgent_for_v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  docs/kernel-parameters: Update descriptions for "mitigations=" param with retbleed
  x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available
  Revert "x86/sev: Expose sev_es_ghcb_hv_call() for use by HyperV"
  x86/configs: Update configs in x86_debug.config
parents 5e4823e6 ea304a8b
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Showing with 22 additions and 33 deletions
Documentation/admin-guide/kernel-parameters.txt
View file @ 89caf575
...@@ -3176,6 +3176,7 @@ ...@@ -3176,6 +3176,7 @@
no_entry_flush [PPC] no_entry_flush [PPC]
no_uaccess_flush [PPC] no_uaccess_flush [PPC]
mmio_stale_data=off [X86] mmio_stale_data=off [X86]
retbleed=off [X86]
Exceptions: Exceptions:
This does not have any effect on This does not have any effect on
...@@ -3198,6 +3199,7 @@ ...@@ -3198,6 +3199,7 @@
mds=full,nosmt [X86] mds=full,nosmt [X86]
tsx_async_abort=full,nosmt [X86] tsx_async_abort=full,nosmt [X86]
mmio_stale_data=full,nosmt [X86] mmio_stale_data=full,nosmt [X86]
retbleed=auto,nosmt [X86]
mminit_loglevel= mminit_loglevel=
[KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
......
arch/x86/include/asm/sev.h
View file @ 89caf575
...@@ -72,7 +72,6 @@ static inline u64 lower_bits(u64 val, unsigned int bits) ...@@ -72,7 +72,6 @@ static inline u64 lower_bits(u64 val, unsigned int bits)
struct real_mode_header; struct real_mode_header;
enum stack_type; enum stack_type;
struct ghcb;
/* Early IDT entry points for #VC handler */ /* Early IDT entry points for #VC handler */
extern void vc_no_ghcb(void); extern void vc_no_ghcb(void);
...@@ -156,11 +155,7 @@ static __always_inline void sev_es_nmi_complete(void) ...@@ -156,11 +155,7 @@ static __always_inline void sev_es_nmi_complete(void)
__sev_es_nmi_complete(); __sev_es_nmi_complete();
} }
extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
extern enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
bool set_ghcb_msr,
struct es_em_ctxt *ctxt,
u64 exit_code, u64 exit_info_1,
u64 exit_info_2);
static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
{ {
int rc; int rc;
......
arch/x86/kernel/cpu/bugs.c
View file @ 89caf575
...@@ -1520,6 +1520,7 @@ static void __init spectre_v2_select_mitigation(void) ...@@ -1520,6 +1520,7 @@ static void __init spectre_v2_select_mitigation(void)
* enable IBRS around firmware calls. * enable IBRS around firmware calls.
*/ */
if (boot_cpu_has_bug(X86_BUG_RETBLEED) && if (boot_cpu_has_bug(X86_BUG_RETBLEED) &&
boot_cpu_has(X86_FEATURE_IBPB) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_AMD || (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)) { boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)) {
......
arch/x86/kernel/sev-shared.c
View file @ 89caf575
...@@ -219,9 +219,10 @@ static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt ...@@ -219,9 +219,10 @@ static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt
return ES_VMM_ERROR; return ES_VMM_ERROR;
} }
enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr, static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
struct es_em_ctxt *ctxt, u64 exit_code, struct es_em_ctxt *ctxt,
u64 exit_info_1, u64 exit_info_2) u64 exit_code, u64 exit_info_1,
u64 exit_info_2)
{ {
/* Fill in protocol and format specifiers */ /* Fill in protocol and format specifiers */
ghcb->protocol_version = ghcb_version; ghcb->protocol_version = ghcb_version;
...@@ -231,14 +232,7 @@ enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr, ...@@ -231,14 +232,7 @@ enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr,
ghcb_set_sw_exit_info_1(ghcb, exit_info_1); ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
ghcb_set_sw_exit_info_2(ghcb, exit_info_2); ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
/* sev_es_wr_ghcb_msr(__pa(ghcb));
* Hyper-V unenlightened guests use a paravisor for communicating and
* GHCB pages are being allocated and set up by that paravisor. Linux
* should not change the GHCB page's physical address.
*/
if (set_ghcb_msr)
sev_es_wr_ghcb_msr(__pa(ghcb));
VMGEXIT(); VMGEXIT();
return verify_exception_info(ghcb, ctxt); return verify_exception_info(ghcb, ctxt);
...@@ -795,7 +789,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt) ...@@ -795,7 +789,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
*/ */
sw_scratch = __pa(ghcb) + offsetof(struct ghcb, shared_buffer); sw_scratch = __pa(ghcb) + offsetof(struct ghcb, shared_buffer);
ghcb_set_sw_scratch(ghcb, sw_scratch); ghcb_set_sw_scratch(ghcb, sw_scratch);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_IOIO, ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_IOIO,
exit_info_1, exit_info_2); exit_info_1, exit_info_2);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
...@@ -837,8 +831,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt) ...@@ -837,8 +831,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
ghcb_set_rax(ghcb, rax); ghcb_set_rax(ghcb, rax);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_IOIO, exit_info_1, 0);
SVM_EXIT_IOIO, exit_info_1, 0);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
...@@ -894,7 +887,7 @@ static enum es_result vc_handle_cpuid(struct ghcb *ghcb, ...@@ -894,7 +887,7 @@ static enum es_result vc_handle_cpuid(struct ghcb *ghcb,
/* xgetbv will cause #GP - use reset value for xcr0 */ /* xgetbv will cause #GP - use reset value for xcr0 */
ghcb_set_xcr0(ghcb, 1); ghcb_set_xcr0(ghcb, 1);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_CPUID, 0, 0); ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_CPUID, 0, 0);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
...@@ -919,7 +912,7 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghcb, ...@@ -919,7 +912,7 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghcb,
bool rdtscp = (exit_code == SVM_EXIT_RDTSCP); bool rdtscp = (exit_code == SVM_EXIT_RDTSCP);
enum es_result ret; enum es_result ret;
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, exit_code, 0, 0); ret = sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
......
arch/x86/kernel/sev.c
View file @ 89caf575
...@@ -786,7 +786,7 @@ static int vmgexit_psc(struct snp_psc_desc *desc) ...@@ -786,7 +786,7 @@ static int vmgexit_psc(struct snp_psc_desc *desc)
ghcb_set_sw_scratch(ghcb, (u64)__pa(data)); ghcb_set_sw_scratch(ghcb, (u64)__pa(data));
/* This will advance the shared buffer data points to. */ /* This will advance the shared buffer data points to. */
ret = sev_es_ghcb_hv_call(ghcb, true, &ctxt, SVM_VMGEXIT_PSC, 0, 0); ret = sev_es_ghcb_hv_call(ghcb, &ctxt, SVM_VMGEXIT_PSC, 0, 0);
/* /*
* Page State Change VMGEXIT can pass error code through * Page State Change VMGEXIT can pass error code through
...@@ -1212,8 +1212,7 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt) ...@@ -1212,8 +1212,7 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
ghcb_set_rdx(ghcb, regs->dx); ghcb_set_rdx(ghcb, regs->dx);
} }
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_MSR, ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MSR, exit_info_1, 0);
exit_info_1, 0);
if ((ret == ES_OK) && (!exit_info_1)) { if ((ret == ES_OK) && (!exit_info_1)) {
regs->ax = ghcb->save.rax; regs->ax = ghcb->save.rax;
...@@ -1452,7 +1451,7 @@ static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt, ...@@ -1452,7 +1451,7 @@ static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
ghcb_set_sw_scratch(ghcb, ghcb_pa + offsetof(struct ghcb, shared_buffer)); ghcb_set_sw_scratch(ghcb, ghcb_pa + offsetof(struct ghcb, shared_buffer));
return sev_es_ghcb_hv_call(ghcb, true, ctxt, exit_code, exit_info_1, exit_info_2); return sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1, exit_info_2);
} }
/* /*
...@@ -1628,7 +1627,7 @@ static enum es_result vc_handle_dr7_write(struct ghcb *ghcb, ...@@ -1628,7 +1627,7 @@ static enum es_result vc_handle_dr7_write(struct ghcb *ghcb,
/* Using a value of 0 for ExitInfo1 means RAX holds the value */ /* Using a value of 0 for ExitInfo1 means RAX holds the value */
ghcb_set_rax(ghcb, val); ghcb_set_rax(ghcb, val);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_WRITE_DR7, 0, 0); ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WRITE_DR7, 0, 0);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
...@@ -1658,7 +1657,7 @@ static enum es_result vc_handle_dr7_read(struct ghcb *ghcb, ...@@ -1658,7 +1657,7 @@ static enum es_result vc_handle_dr7_read(struct ghcb *ghcb,
static enum es_result vc_handle_wbinvd(struct ghcb *ghcb, static enum es_result vc_handle_wbinvd(struct ghcb *ghcb,
struct es_em_ctxt *ctxt) struct es_em_ctxt *ctxt)
{ {
return sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_WBINVD, 0, 0); return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);
} }
static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt) static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
...@@ -1667,7 +1666,7 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt ...@@ -1667,7 +1666,7 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt
ghcb_set_rcx(ghcb, ctxt->regs->cx); ghcb_set_rcx(ghcb, ctxt->regs->cx);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_RDPMC, 0, 0); ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDPMC, 0, 0);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
...@@ -1708,7 +1707,7 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb, ...@@ -1708,7 +1707,7 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
if (x86_platform.hyper.sev_es_hcall_prepare) if (x86_platform.hyper.sev_es_hcall_prepare)
x86_platform.hyper.sev_es_hcall_prepare(ghcb, ctxt->regs); x86_platform.hyper.sev_es_hcall_prepare(ghcb, ctxt->regs);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_VMMCALL, 0, 0); ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_VMMCALL, 0, 0);
if (ret != ES_OK) if (ret != ES_OK)
return ret; return ret;
...@@ -2197,7 +2196,7 @@ int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned ...@@ -2197,7 +2196,7 @@ int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned
ghcb_set_rbx(ghcb, input->data_npages); ghcb_set_rbx(ghcb, input->data_npages);
} }
ret = sev_es_ghcb_hv_call(ghcb, true, &ctxt, exit_code, input->req_gpa, input->resp_gpa); ret = sev_es_ghcb_hv_call(ghcb, &ctxt, exit_code, input->req_gpa, input->resp_gpa);
if (ret) if (ret)
goto e_put; goto e_put;
......
kernel/configs/x86_debug.config
View file @ 89caf575
...@@ -7,12 +7,11 @@ CONFIG_DEBUG_SLAB=y ...@@ -7,12 +7,11 @@ CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_KMEMLEAK=y CONFIG_DEBUG_KMEMLEAK=y
CONFIG_DEBUG_PAGEALLOC=y CONFIG_DEBUG_PAGEALLOC=y
CONFIG_SLUB_DEBUG_ON=y CONFIG_SLUB_DEBUG_ON=y
CONFIG_KMEMCHECK=y
CONFIG_DEBUG_OBJECTS=y CONFIG_DEBUG_OBJECTS=y
CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1 CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1
CONFIG_GCOV_KERNEL=y CONFIG_GCOV_KERNEL=y
CONFIG_LOCKDEP=y CONFIG_LOCKDEP=y
CONFIG_PROVE_LOCKING=y CONFIG_PROVE_LOCKING=y
CONFIG_SCHEDSTATS=y CONFIG_SCHEDSTATS=y
CONFIG_VMLINUX_VALIDATION=y CONFIG_NOINSTR_VALIDATION=y
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
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