- 07 May, 2018 1 commit
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van der Linden, Frank authored
This patch fixes crashes during boot for HVM guests on older (pre HVM vector callback) Xen versions. Without this, current kernels will always fail to boot on those Xen versions. Sample stack trace: BUG: unable to handle kernel paging request at ffffffffff200000 IP: __xen_evtchn_do_upcall+0x1e/0x80 PGD 1e0e067 P4D 1e0e067 PUD 1e10067 PMD 235c067 PTE 0 Oops: 0002 [#1] SMP PTI Modules linked in: CPU: 0 PID: 512 Comm: kworker/u2:0 Not tainted 4.14.33-52.13.amzn1.x86_64 #1 Hardware name: Xen HVM domU, BIOS 3.4.3.amazon 11/11/2016 task: ffff88002531d700 task.stack: ffffc90000480000 RIP: 0010:__xen_evtchn_do_upcall+0x1e/0x80 RSP: 0000:ffff880025403ef0 EFLAGS: 00010046 RAX: ffffffff813cc760 RBX: ffffffffff200000 RCX: ffffc90000483ef0 RDX: ffff880020540a00 RSI: ffff880023c78000 RDI: 000000000000001c RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff880025403f5c R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff880025400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff200000 CR3: 0000000001e0a000 CR4: 00000000000006f0 Call Trace: <IRQ> do_hvm_evtchn_intr+0xa/0x10 __handle_irq_event_percpu+0x43/0x1a0 handle_irq_event_percpu+0x20/0x50 handle_irq_event+0x39/0x60 handle_fasteoi_irq+0x80/0x140 handle_irq+0xaf/0x120 do_IRQ+0x41/0xd0 common_interrupt+0x7d/0x7d </IRQ> During boot, the HYPERVISOR_shared_info page gets remapped to make it work with KASLR. This means that any pointer derived from it needs to be adjusted. The only value that this applies to is the vcpu_info pointer for VCPU 0. For PV and HVM with the callback vector feature, this gets done via the smp_ops prepare_boot_cpu callback. Older Xen versions do not support the HVM callback vector, so there is no Xen-specific smp_ops set up in that scenario. So, the vcpu_info pointer for VCPU 0 never gets set to the proper value, and the first reference of it will be bad. Fix this by resetting it immediately after the remap. Signed-off-by:Frank van der Linden <fllinden@amazon.com> Reviewed-by:
Eduardo Valentin <eduval@amazon.com> Reviewed-by:
Alakesh Haloi <alakeshh@amazon.com> Reviewed-by:
Vallish Vaidyeshwara <vallish@amazon.com> Reviewed-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Juergen Gross <jgross@suse.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: xen-devel@lists.xenproject.org Signed-off-by:
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- 19 Apr, 2018 1 commit
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Laura Abbott authored
There's an ongoing effort to remove VLAs[1] from the kernel to eventually turn on -Wvla. It turns out, the few VLAs in use in Xen produce only a single entry array that is always bounded by GDT_SIZE. Clean up the code to get rid of the VLA and the loop. [1] https://lkml.org/lkml/2018/3/7/621Signed-off-by:
Laura Abbott <labbott@redhat.com> Reviewed-by:
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- 17 Apr, 2018 2 commits
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Simon Gaiser authored
xenbus_command_reply() did not actually copy the response string and leaked stack content instead. Fixes: 9a6161fe ("xen: return xenstore command failures via response instead of rc") Signed-off-by:
Simon Gaiser <simon@invisiblethingslab.com> Reviewed-by:
Juergen Gross <jgross@suse.com> Signed-off-by:
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Oleksandr Andrushchenko authored
This is the sync up with the canonical definition of the sound protocol in Xen: 1. Protocol version was referenced in the protocol description, but missed its definition. Fixed by adding a constant for current protocol version. 2. Some of the request descriptions have "reserved" fields missed: fixed by adding corresponding entries. 3. Extend the size of the requests and responses to 64 octets. Bump protocol version to 2. 4. Add explicit back and front synchronization In order to provide explicit synchronization between backend and frontend the following changes are introduced in the protocol: - add new ring buffer for sending asynchronous events from backend to frontend to report number of bytes played by the frontend (XENSND_EVT_CUR_POS) - introduce trigger events for playback control: start/stop/pause/resume - add "req-" prefix to event-channel and ring-ref to unify naming of the Xen event channels for requests and events 5. Add explicit back and front parameter negotiation In order to provide explicit stream parameter negotiation between backend and frontend the following changes are introduced in the protocol: add XENSND_OP_HW_PARAM_QUERY request to read/update configuration space for the parameters given: request passes desired parameter's intervals/masks and the response to this request returns allowed min/max intervals/masks to be used. Signed-off-by:Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by:
Oleksandr Grytsov <oleksandr_grytsov@epam.com> Reviewed-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by:
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- 16 Apr, 2018 5 commits
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Jia-Ju Bai authored
pcistub_reg_add() is never called in atomic context. pcistub_reg_add() is only called by pcistub_quirk_add, which is only set in DRIVER_ATTR(). Despite never getting called from atomic context, pcistub_reg_add() calls kzalloc() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by:
Jia-Ju Bai <baijiaju1990@gmail.com> Reviewed-by:
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Jia-Ju Bai authored
xen_pcibk_config_quirks_init() is never called in atomic context. The call chains ending up at xen_pcibk_config_quirks_init() are: [1] xen_pcibk_config_quirks_init() <- xen_pcibk_config_init_dev() <- pcistub_init_device() <- pcistub_seize() <- pcistub_probe() [2] xen_pcibk_config_quirks_init() <- xen_pcibk_config_init_dev() <- pcistub_init_device() <- pcistub_init_devices_late() <- xen_pcibk_init() pcistub_probe() is only set as ".probe" in struct pci_driver. xen_pcibk_init() is is only set as a parameter of module_init(). These functions are not called in atomic context. Despite never getting called from atomic context, xen_pcibk_config_quirks_init() calls kzalloc() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. Signed-off-by:
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Jia-Ju Bai authored
pcistub_device_alloc() is never called in atomic context. The call chain ending up at pcistub_device_alloc() is: [1] pcistub_device_alloc() <- pcistub_seize() <- pcistub_probe() pcistub_probe() is only set as ".probe" in struct pci_driver. This function is not called in atomic context. Despite never getting called from atomic context, pcistub_device_alloc() calls kzalloc() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. Signed-off-by:
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Jia-Ju Bai authored
pcistub_init_device() is never called in atomic context. The call chain ending up at pcistub_init_device() is: [1] pcistub_init_device() <- pcistub_seize() <- pcistub_probe() [2] pcistub_init_device() <- pcistub_init_devices_late() <- xen_pcibk_init() pcistub_probe() is only set as ".probe" in struct pci_driver. xen_pcibk_init() is is only set as a parameter of module_init(). These functions are not called in atomic context. Despite never getting called from atomic context, pcistub_init_device() calls kzalloc() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by:
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Jia-Ju Bai authored
pcistub_probe() is never called in atomic context. This function is only set as ".probe" in struct pci_driver. Despite never getting called from atomic context, pcistub_probe() calls kmalloc() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by:
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- 10 Apr, 2018 1 commit
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Boris Ostrovsky authored
Pre-4.17 kernels ignored start_info's rsdp_paddr pointer and instead relied on finding RSDP in standard location in BIOS RO memory. This has worked since that's where Xen used to place it. However, with recent Xen change (commit 4a5733771e6f ("libxl: put RSDP for PVH guest near 4GB")) it prefers to keep RSDP at a "non-standard" address. Even though as of commit b17d9d1d ("x86/xen: Add pvh specific rsdp address retrieval function") Linux is able to find RSDP, for back-compatibility reasons we need to indicate to Xen that we can handle this, an we do so by setting XENFEAT_linux_rsdp_unrestricted flag in ELF notes. (Also take this opportunity and sync features.h header file with Xen) Signed-off-by:Wei Liu <wei.liu2@citrix.com>
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- 30 Mar, 2018 1 commit
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Dan Carpenter authored
If acpi_id is == nr_acpi_bits, then we access one element beyond the end of the acpi_psd[] array or we set one bit beyond the end of the bit map when we do __set_bit(acpi_id, acpi_id_present); Fixes: 59a56802 ("xen/acpi-processor: C and P-state driver that uploads said data to hypervisor.") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
Joao Martins <joao.m.martins@oracle.com> Reviewed-by:
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- 21 Mar, 2018 5 commits
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Joao Martins authored
All uploaded PM data from non-dom0 CPUs takes the info from vCPU 0 and changing only the acpi_id. For processors which P-state coordination type is HW_ALL (0xFD) it is OK to upload bogus P-state dependency information (_PSD), because Xen will ignore any cpufreq domains created for past CPUs. Albeit for platforms which expose coordination types as SW_ANY or SW_ALL, this will have some unintended side effects. Effectively, it will look at the P-state domain existence and *if it already exists* it will skip the acpi-cpufreq initialization and thus inherit the policy from the first CPU in the cpufreq domain. This will finally lead to the original cpu not changing target freq to P0 other than the first in the domain. Which will make turbo boost not getting enabled (e.g. for 'performance' governor) for all cpus. This patch fixes that, by also evaluating _PSD when we enumerate all ACPI processors and thus always uploading the correct info to Xen. We export acpi_processor_get_psd() for that this purpose, but change signature to not assume an existent of acpi_processor given that ACPI isn't creating an acpi_processor for non-dom0 CPUs. Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Jason Andryuk authored
Commit 2cc42bac ("x86-64/Xen: eliminate W+X mappings") introduced a call to get_cpu_cap, which is fstack-protected. This is works on x86-64 as commit 4f277295 ("x86/xen: init %gs very early to avoid page faults with stack protector") ensures the stack protector is configured, but it it did not cover x86-32. Delay calling get_cpu_cap until after xen_setup_gdt has initialized the stack canary. Without this, a 32bit PV machine crashes early in boot. (XEN) Domain 0 (vcpu#0) crashed on cpu#0: (XEN) ----[ Xen-4.6.6-xc x86_64 debug=n Tainted: C ]---- (XEN) CPU: 0 (XEN) RIP: e019:[<00000000c10362f8>] And the PV kernel IP corresponds to init_scattered_cpuid_features 0xc10362f8 <+24>: mov %gs:0x14,%eax Fixes 2cc42bac ("x86-64/Xen: eliminate W+X mappings") Signed-off-by:
Jason Andryuk <jandryuk@gmail.com> Reviewed-by:
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Simon Gaiser authored
By guaranteeing that the argument of XS_TRANSACTION_END is valid we can assume that the transaction has been closed when we get an XS_ERROR response from xenstore (Note that we already verify that it's a valid transaction id). Signed-off-by:
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Simon Gaiser authored
Users of the xenbus functions should never close a non existent transaction (for example by trying to closing the same transaction twice) but better catch it in xs_request_exit() than to corrupt the reference counter. Signed-off-by:
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Simon Gaiser authored
Commit fd8aa909 ("xen: optimize xenbus driver for multiple concurrent xenstore accesses") made a subtle change to the semantic of xenbus_dev_request_and_reply() and xenbus_transaction_end(). Before on an error response to XS_TRANSACTION_END xenbus_dev_request_and_reply() would not decrement the active transaction counter. But xenbus_transaction_end() has always counted the transaction as finished regardless of the response. The new behavior is that xenbus_dev_request_and_reply() and xenbus_transaction_end() will always count the transaction as finished regardless the response code (handled in xs_request_exit()). But xenbus_dev_frontend tries to end a transaction on closing of the device if the XS_TRANSACTION_END failed before. Trying to close the transaction twice corrupts the reference count. So fix this by also considering a transaction closed if we have sent XS_TRANSACTION_END once regardless of the return code. Cc: <stable@vger.kernel.org> # 4.11 Fixes: fd8aa909 ("xen: optimize xenbus driver for multiple concurrent xenstore accesses") Signed-off-by:
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- 19 Mar, 2018 1 commit
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Linus Torvalds authored
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- 18 Mar, 2018 5 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86/pti updates from Thomas Gleixner: "Another set of melted spectrum updates: - Iron out the last late microcode loading issues by actually checking whether new microcode is present and preventing the CPU synchronization to run into a timeout induced hang. - Remove Skylake C2 from the microcode blacklist according to the latest Intel documentation - Fix the VM86 POPF emulation which traps if VIP is set, but VIF is not. Enhance the selftests to catch that kind of issue - Annotate indirect calls/jumps for objtool on 32bit. This is not a functional issue, but for consistency sake its the right thing to do. - Fix a jump label build warning observed on SPARC64 which uses 32bit storage for the code location which is casted to 64 bit pointer w/o extending it to 64bit first. - Add two new cpufeature bits. Not really an urgent issue, but provides them for both x86 and x86/kvm work. No impact on the current kernel" * 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/microcode: Fix CPU synchronization routine x86/microcode: Attempt late loading only when new microcode is present x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist jump_label: Fix sparc64 warning x86/speculation, objtool: Annotate indirect calls/jumps for objtool on 32-bit kernels x86/vm86/32: Fix POPF emulation selftests/x86/entry_from_vm86: Add test cases for POPF selftests/x86/entry_from_vm86: Exit with 1 if we fail x86/cpufeatures: Add Intel PCONFIG cpufeature x86/cpufeatures: Add Intel Total Memory Encryption cpufeature -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fix from Thomas Gleixner: "A single fix for vmalloc_fault() which uses p*d_huge() unconditionally whether CONFIG_HUGETLBFS is set or not. In case of CONFIG_HUGETLBFS=n this results in a crash as p*d_huge() returns 0 in that case" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Fix vmalloc_fault to use pXd_large
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull irq fixes from Thomas Gleixner: "Three fixes for irq chip drivers: - Make sure the allocations in the GIC-V3 ITS driver are large enough to accomodate the interrupt space - Fix a misplaced __iomem annotation which causes a splat of 26 sparse warnings - Remove an unused function in the IMX GPCV2 driver which causes build warnings" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/irq-imx-gpcv2: Remove unused function irqchip/gic-v3-its: Ensure nr_ites >= nr_lpis irqchip/gic-v3-its: Fix misplaced __iomem annotations -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull EFI fix from Thomas Gleixner: "A single fix to prevent partially initialized pointers in mixed mode (64bit kernel on 32bit UEFI)" * 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: efi/libstub/tpm: Initialize pointer variables to zero for mixed mode
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git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds authored
Pull KVM fixes from Paolo Bonzini: "PPC: - fix bug leading to lost IPIs and smp_call_function_many() lockups on POWER9 ARM: - locking fix - reset fix - GICv2 multi-source SGI injection fix - GICv2-on-v3 MMIO synchronization fix - make the console less verbose. x86: - fix device passthrough on AMD SME" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: x86: Fix device passthrough when SME is active kvm: arm/arm64: vgic-v3: Tighten synchronization for guests using v2 on v3 KVM: arm/arm64: vgic: Don't populate multiple LRs with the same vintid KVM: arm/arm64: Reduce verbosity of KVM init log KVM: arm/arm64: Reset mapped IRQs on VM reset KVM: arm/arm64: Avoid vcpu_load for other vcpu ioctls than KVM_RUN KVM: arm/arm64: vgic: Add missing irq_lock to vgic_mmio_read_pending KVM: PPC: Book3S HV: Fix trap number return from __kvmppc_vcore_entry
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- 17 Mar, 2018 1 commit
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John David Anglin authored
Just when I had decided that flush_cache_range() was always called with a valid context, Helge reported two cases where the "BUG_ON(!vma->vm_mm->context);" was hit on the phantom buildd: kernel BUG at /mnt/sdb6/linux/linux-4.15.4/arch/parisc/kernel/cache.c:587! CPU: 1 PID: 3254 Comm: kworker/1:2 Tainted: G D 4.15.0-1-parisc64-smp #1 Debian 4.15.4-1+b1 Workqueue: events free_ioctx IAOQ[0]: flush_cache_range+0x164/0x168 IAOQ[1]: flush_cache_page+0x0/0x1c8 RP(r2): unmap_page_range+0xae8/0xb88 Backtrace: [<00000000404a6980>] unmap_page_range+0xae8/0xb88 [<00000000404a6ae0>] unmap_single_vma+0xc0/0x188 [<00000000404a6cdc>] zap_page_range_single+0x134/0x1f8 [<00000000404a702c>] unmap_mapping_range+0x1cc/0x208 [<0000000040461518>] truncate_pagecache+0x98/0x108 [<0000000040461624>] truncate_setsize+0x9c/0xb8 [<00000000405d7f30>] put_aio_ring_file+0x80/0x100 [<00000000405d803c>] aio_free_ring+0x8c/0x290 [<00000000405d82c0>] free_ioctx+0x80/0x180 [<0000000040284e6c>] process_one_work+0x21c/0x668 [<00000000402854c4>] worker_thread+0x20c/0x778 [<0000000040291d44>] kthread+0x2d4/0x2e0 [<0000000040204020>] end_fault_vector+0x20/0xc0 This indicates that we need to handle the no context case in flush_cache_range() as we do in flush_cache_mm(). In thinking about this, I realized that we don't need to flush the TLB when there is no context. So, I added context checks to the large flush cases in flush_cache_mm() and flush_cache_range(). The large flush case occurs frequently in flush_cache_mm() and the change should improve fork performance. The v2 version of this change removes the BUG_ON from flush_cache_page() by skipping the TLB flush when there is no context. I also added code to flush the TLB in flush_cache_mm() and flush_cache_range() when we have a context that's not current. Now all three routines handle TLB flushes in a similar manner. Signed-off-by:
John David Anglin <dave.anglin@bell.net> Cc: stable@vger.kernel.org # 4.9+ Signed-off-by:
Helge Deller <deller@gmx.de>
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- 16 Mar, 2018 17 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linuxLinus Torvalds authored
Pull btrfs fixes from David Sterba: "There's an important revert in this pull request that needs to go to stable as it causes a corruption on big endian machines. The other fix is for FIEMAP incorrectly reporting shared extents before a sync and one fix for a crash in raid56. So far we got only one report about the BE corruption, the stable kernels were out for like a week, so hopefully the scope of the damage is low" * tag 'for-4.16-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: Revert "btrfs: use proper endianness accessors for super_copy" btrfs: add missing initialization in btrfs_check_shared btrfs: Fix NULL pointer exception in find_bio_stripe
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git://git.monstr.eu/linux-2.6-microblazeLinus Torvalds authored
Pull microblaze fixes from Michal Simek: - Use NO_BOOTMEM to fix boot issue - Fix opt lib endian dependencies * tag 'microblaze-4.16-rc6' of git://git.monstr.eu/linux-2.6-microblaze: microblaze: switch to NO_BOOTMEM microblaze: remove unused alloc_maybe_bootmem microblaze: Setup dependencies for ASM optimized lib functions
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Borislav Petkov authored
Emanuel reported an issue with a hang during microcode update because my dumb idea to use one atomic synchronization variable for both rendezvous - before and after update - was simply bollocks: microcode: microcode_reload_late: late_cpus: 4 microcode: __reload_late: cpu 2 entered microcode: __reload_late: cpu 1 entered microcode: __reload_late: cpu 3 entered microcode: __reload_late: cpu 0 entered microcode: __reload_late: cpu 1 left microcode: Timeout while waiting for CPUs rendezvous, remaining: 1 CPU1 above would finish, leave and the others will still spin waiting for it to join. So do two synchronization atomics instead, which makes the code a lot more straightforward. Also, since the update is serialized and it also takes quite some time per microcode engine, increase the exit timeout by the number of CPUs on the system. That's ok because the moment all CPUs are done, that timeout will be cut short. Furthermore, panic when some of the CPUs timeout when returning from a microcode update: we can't allow a system with not all cores updated. Also, as an optimization, do not do the exit sync if microcode wasn't updated. Reported-by:
Emanuel Czirai <xftroxgpx@protonmail.com> Signed-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Tested-by:
Ashok Raj <ashok.raj@intel.com> Tested-by:
Tom Lendacky <thomas.lendacky@amd.com> Link: https://lkml.kernel.org/r/20180314183615.17629-2-bp@alien8.de
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Borislav Petkov authored
Return UCODE_NEW from the scanning functions to denote that new microcode was found and only then attempt the expensive synchronization dance. Reported-by:
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Pull drm fixes from Dave Airlie: "i915, amd and nouveau fixes. i915: - backlight fix for some panels - pm fix - fencing fix - some GVT fixes amdgpu: - backlight fix across suspend/resume - object destruction ordering issue fix - displayport fix nouveau: - two backlight fixes - fix for some lockups Pretty quiet week, seems like everyone was fixing backlights" * tag 'drm-fixes-for-v4.16-rc6' of git://people.freedesktop.org/~airlied/linux: drm/nouveau/bl: fix backlight regression drm/nouveau/bl: Fix oops on driver unbind drm/nouveau/mmu: ALIGN_DOWN correct variable drm/i915/gvt: fix user copy warning by whitelist workload rb_tail field drm/i915/gvt: Correct the privilege shadow batch buffer address drm/amdgpu/dce: Don't turn off DP sink when disconnected drm/amdgpu: save/restore backlight level in legacy dce code drm/radeon: fix prime teardown order drm/amdgpu: fix prime teardown order drm/i915: Kick the rps worker when changing the boost frequency drm/i915: Only prune fences after wait-for-all drm/i915: Enable VBT based BL control for DP drm/i915/gvt: keep oa config in shadow ctx drm/i915/gvt: Add runtime_pm_get/put into gvt_switch_mmio
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David Sterba authored
This reverts commit 3c181c12. The offending patch was merged in 4.16-rc4 and was promptly applied to stable kernels 4.14.25 and 4.15.8. The patch causes a corruption in several superblock items on big-endian machines because of messed up endianity conversions. The damage is manually repairable. A filesystem cannot be mounted again after it has been unmounted once. We do a full revert and not a fixup so stable can pick that patch ASAP. Fixes: 3c181c12 ("btrfs: use proper endianness accessors for super_copy") Link: https://lkml.kernel.org/r/1521139304@msgid.manchmal.in-ulm.de CC: stable@vger.kernel.org # 4.14+ Reported-by:
Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de> Signed-off-by:
David Sterba <dsterba@suse.com>
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Tom Lendacky authored
When using device passthrough with SME active, the MMIO range that is mapped for the device should not be mapped encrypted. Add a check in set_spte() to insure that a page is not mapped encrypted if that page is a device MMIO page as indicated by kvm_is_mmio_pfn(). Cc: <stable@vger.kernel.org> # 4.14.x- Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Rob Herring authored
Microblaze doesn't set CONFIG_NO_BOOTMEM and so memblock_virt_alloc() doesn't work for CONFIG_HAVE_MEMBLOCK && !CONFIG_NO_BOOTMEM. Similar change was already done by others architectures "ARM: mm: Remove bootmem code and switch to NO_BOOTMEM" (sha1: 84f452b1) or "openrisc: Consolidate setup to use memblock instead of bootmem" (sha1: 266c7fad) or "parisc: Drop bootmem and switch to memblock" (sha1: 4fe9e1d9) or "powerpc: Remove bootmem allocator" (sha1: 10239733) or "s390/mm: Convert bootmem to memblock" (sha1: 50be6345) or "sparc64: Convert over to NO_BOOTMEM." (sha1: 625d693e) or "xtensa: drop sysmem and switch to memblock" (sha1: 0e46c111) Issue was introduced by: "of/fdt: use memblock_virt_alloc for early alloc" (sha1: 0fa1c579) Signed-off-by:
Rob Herring <robh@kernel.org> Tested-by:
Alvaro Gamez Machado <alvaro.gamez@hazent.com> Tested-by:
Michal Simek <michal.simek@xilinx.com> Signed-off-by:
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Rob Herring authored
alloc_maybe_bootmem is unused, so remove it. Signed-off-by:
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Michal Simek authored
The patch: "microblaze: Setup proper dependency for optimized lib functions" (sha1: 7b6ce52b) didn't setup all dependencies properly. Optimized lib functions in C are also present for little endian and optimized library functions in assembler are implemented only for big endian version. Reported-by:
kbuild test robot <fengguang.wu@intel.com> Signed-off-by:
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Alexander Sergeyev authored
In accordance with Intel's microcode revision guidance from March 6 MCU rev 0xc2 is cleared on both Skylake H/S and Skylake Xeon E3 processors that share CPUID 506E3. Signed-off-by:
Alexander Sergeyev <sergeev917@gmail.com> Signed-off-by:
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Dave Airlie authored
Merge tag 'drm-intel-fixes-2018-03-15' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes Only GVT fixes: - Two warnings fix for runtime pm and usr copy (Xiong, Zhenyu) - OA context fix for vGPU profiling (Min) - privilege batch buffer reloc fix (Fred) * tag 'drm-intel-fixes-2018-03-15' of git://anongit.freedesktop.org/drm/drm-intel: drm/i915/gvt: fix user copy warning by whitelist workload rb_tail field drm/i915/gvt: Correct the privilege shadow batch buffer address drm/i915/gvt: keep oa config in shadow ctx drm/i915/gvt: Add runtime_pm_get/put into gvt_switch_mmio
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git://github.com/skeggsb/linuxDave Airlie authored
nouveau regression fixes. * 'linux-4.16' of git://github.com/skeggsb/linux: drm/nouveau/bl: fix backlight regression drm/nouveau/bl: Fix oops on driver unbind drm/nouveau/mmu: ALIGN_DOWN correct variable
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds authored
Pull vfs fixes from Al Viro: - backport-friendly part of lock_parent() race fix - a fix for an assumption in the heurisic used by path_connected() that is not true on NFS - livelock fixes for d_alloc_parallel() * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: Teach path_connected to handle nfs filesystems with multiple roots. fs: dcache: Use READ_ONCE when accessing i_dir_seq fs: dcache: Avoid livelock between d_alloc_parallel and __d_add lock_parent() needs to recheck if dentry got __dentry_kill'ed under it
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Karol Herbst authored
Fixes: 3c66c87d ("drm/nouveau/disp: remove hw-specific customisation of output paths") Suggested-by:
Ben Skeggs <skeggsb@redhat.com> Signed-off-by:
Karol Herbst <kherbst@redhat.com> Signed-off-by:
Ben Skeggs <bskeggs@redhat.com>
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Lukas Wunner authored
Unbinding nouveau on a dual GPU MacBook Pro oopses because we iterate over the bl_connectors list in nouveau_backlight_exit() but skipped initializing it in nouveau_backlight_init(). Stacktrace for posterity: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: nouveau_backlight_exit+0x2b/0x70 [nouveau] nouveau_display_destroy+0x29/0x80 [nouveau] nouveau_drm_unload+0x65/0xe0 [nouveau] drm_dev_unregister+0x3c/0xe0 [drm] drm_put_dev+0x2e/0x60 [drm] nouveau_drm_device_remove+0x47/0x70 [nouveau] pci_device_remove+0x36/0xb0 device_release_driver_internal+0x157/0x220 driver_detach+0x39/0x70 bus_remove_driver+0x51/0xd0 pci_unregister_driver+0x2a/0xa0 nouveau_drm_exit+0x15/0xfb0 [nouveau] SyS_delete_module+0x18c/0x290 system_call_fast_compare_end+0xc/0x6f Fixes: b53ac1ee ("drm/nouveau/bl: Do not register interface if Apple GMUX detected") Cc: stable@vger.kernel.org # v4.10+ Cc: Pierre Moreau <pierre.morrow@free.fr> Signed-off-by:Lukas Wunner <lukas@wunner.de> Signed-off-by:
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Māris Nartišs authored
Commit 7110c89bb8852ff8b0f88ce05b332b3fe22bd11e ("mmu: swap out round for ALIGN") replaced two calls to round/rounddown with ALIGN/ALIGN_DOWN, but erroneously applied ALIGN_DOWN to a different variable (addr) and left intended variable (tail) not rounded/ALIGNed. As a result screen corruption, X lockups are observable. An example of kernel log of affected system with NV98 card where it was bisected: nouveau 0000:01:00.0: gr: TRAP_M2MF 00000002 [IN] nouveau 0000:01:00.0: gr: TRAP_M2MF 00320951 400007c0 00000000 04000000 nouveau 0000:01:00.0: gr: 00200000 [] ch 1 [000fbbe000 DRM] subc 4 class 5039 mthd 0100 data 00000000 nouveau 0000:01:00.0: fb: trapped read at 0040000000 on channel 1 [0fbbe000 DRM] engine 00 [PGRAPH] client 03 [DISPATCH] subclient 04 [M2M_IN] reason 00000006 [NULL_DMAOBJ] Fixes bug 105173 ("[MCP79][Regression] Unhandled NULL pointer dereference in nvkm_object_unmap since kernel 4.15") https://bugs.freedesktop.org/show_bug.cgi?id=105173 Fixes: 7110c89bb885 ("mmu: swap out round for ALIGN ") Tested-by:Pierre Moreau <pierre.morrow@free.fr> Reviewed-by:
Maris Nartiss <maris.nartiss@gmail.com> Signed-off-by:
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