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Andi Kleen 9b1beaf2b5 x86, mce: support action-optional machine checks 
Newer Intel CPUs support a new class of machine checks called recoverable
action optional.

Action Optional means that the CPU detected some form of corruption in
the background and tells the OS about using a machine check
exception. The OS can then take appropiate action, like killing the
process with the corrupted data or logging the event properly to disk.

This is done by the new generic high level memory failure handler added
in a earlier patch. The high level handler takes the address with the
failed memory and does the appropiate action, like killing the process.

In this version of the patch the high level handler is stubbed out
with a weak function to not create a direct dependency on the hwpoison
branch.

The high level handler cannot be directly called from the machine check
exception though, because it has to run in a defined process context to
be able to sleep when taking VM locks (it is not expected to sleep for a
long time, just do so in some exceptional cases like lock contention)

Thus the MCE handler has to queue a work item for process context,
trigger process context and then call the high level handler from there.

This patch adds two path to process context: through a per thread kernel
exit notify_user() callback or through a high priority work item.
The first runs when the process exits back to user space, the other when
it goes to sleep and there is no higher priority process.

The machine check handler will schedule both, and whoever runs first
will grab the event. This is done because quick reaction to this
event is critical to avoid a potential more fatal machine check
when the corruption is consumed.

There is a simple lock less ring buffer to queue the corrupted
addresses between the exception handler and the process context handler.
Then in process context it just calls the high level VM code with
the corrupted PFNs.

The code adds the required code to extract the failed address from
the CPU's machine check registers. It doesn't try to handle all
possible cases -- the specification has 6 different ways to specify
memory address -- but only the linear address.

Most of the required checking has been already done earlier in the
mce_severity rule checking engine.  Following the Intel
recommendations Action Optional errors are only enabled for known
situations (encoded in MCACODs). The errors are ignored otherwise,
because they are action optional.

v2: Improve comment, disable preemption while processing ring buffer
    (reported by Ying Huang)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-06-03 14:48:59 -07:00
..
uv x86: UV BAU messaging timeouts 2009-04-03 18:25:27 +02:00
visws
xen Xen: Add virt_to_pfn helper function 2009-04-08 11:51:46 -07:00
a.out-core.h x86: add %gs accessors for x86_32 2009-02-10 00:41:58 +01:00
a.out.h
acpi.h x86: use early_ioremap in __acpi_map_table 2009-02-09 13:33:51 +01:00
aes.h crypto: aes - Export x86 AES encrypt/decrypt functions 2009-02-18 16:48:05 +08:00
agp.h
alternative-asm.h
alternative.h
amd_iommu_types.h AMD IOMMU: add init code for statistic collection 2009-01-03 14:11:58 +01:00
amd_iommu.h
apic.h x86: x2apic, IR: Clean up X86_X2APIC and INTR_REMAP config checks 2009-04-21 09:08:25 +02:00
apicdef.h x86: display extended apic registers with print_local_APIC and cpu_debug code 2009-05-11 14:37:36 +02:00
apicnum.h irq: initialize nr_irqs based on nr_cpu_ids 2009-01-11 19:13:38 +01:00
apm.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
asm.h
atomic_32.h atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
atomic_64.h atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
atomic.h
auxvec.h
bios_ebda.h
bitops.h x86, generic: mark complex bitops.h inlines as __always_inline 2009-01-13 18:56:30 +01:00
boot.h x86: remove zImage support 2009-03-11 11:00:00 -07:00
bootparam.h
bug.h
bugs.h
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h
cacheflush.h Merge branch 'tracing/core-v2' into tracing-for-linus 2009-04-02 00:49:02 +02:00
calgary.h
calling.h x86: document 64-bit and 32-bit function call convention ABI 2009-02-03 19:48:18 +01:00
checksum_32.h
checksum_64.h
checksum.h
cmpxchg_32.h
cmpxchg_64.h
cmpxchg.h
compat.h
cpu_debug.h x86: cpu_debug remove execute permission 2009-04-09 06:34:02 +02:00
cpu.h x86: generalize boot_cpu_id 2009-01-29 14:17:01 +01:00
cpufeature.h x86: clean up and fix setup_clear/force_cpu_cap handling 2009-05-11 10:57:24 +02:00
cpumask.h x86: unify cpu_callin_mask/cpu_callout_mask/cpu_initialized_mask/cpu_sibling_setup_mask 2009-03-13 14:49:54 +10:30
cputime.h
current.h x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit. 2009-01-19 00:38:58 +09:00
debugreg.h
delay.h
desc_defs.h
desc.h FRV: Fix the section attribute on UP DECLARE_PER_CPU() 2009-04-21 19:39:59 -07:00
device.h x86, ia64: convert to use generic dma_map_ops struct 2009-01-06 14:06:57 +01:00
div64.h
dma-mapping.h dma-mapping: replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24) 2009-04-07 08:31:12 -07:00
dma.h
dmi.h x86/dmi: fix dmi_alloc() section mismatches 2009-03-23 17:20:50 +01:00
do_timer.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
ds.h
dwarf2.h
e820.h x86: e820 fix various signedness issues in setup.c and e820.c 2009-03-23 15:02:05 +05:30
edac.h
efi.h x86: EFI: Back efi_ioremap with init_memory_mapping instead of FIX_MAP 2009-03-04 19:20:16 +01:00
elf.h x86: make lazy %gs optional on x86_32 2009-02-10 00:42:00 +01:00
emergency-restart.h
entry_arch.h x86: fix panic with interrupts off (needed for MCE) 2009-06-03 14:45:35 -07:00
errno.h
fb.h
fcntl.h
fixmap.h x86: fix set_fixmap to use phys_addr_t 2009-04-10 20:27:13 +02:00
floppy.h
frame.h
ftrace.h tracing/syscalls: support for syscalls tracing on x86 2009-03-13 16:57:42 +01:00
futex.h
gart.h
genapic.h x86, apic: merge genapic.h into apic.h 2009-02-17 17:52:43 +01:00
geode.h
gpio.h
hardirq.h x86, mce: enable MCE_INTEL for 32bit new MCE 2009-05-28 09:24:13 -07:00
highmem.h x86: unify kmap_atomic_pfn() and iomap_atomic_prot_pfn() 2009-03-11 15:47:46 +01:00
hpet.h
hugetlb.h
hw_irq.h x86: fix panic with interrupts off (needed for MCE) 2009-06-03 14:45:35 -07:00
hypertransport.h
hypervisor.h
i387.h x86, math-emu: fix init_fpu for task != current 2009-03-04 20:33:16 +01:00
i8253.h
i8259.h x86: move x86_quirk_pre_intr_init() to irqinit_32.c 2009-04-10 14:35:53 +02:00
ia32_unistd.h
ia32.h generic compat_sys_ustat 2009-03-27 14:43:57 -04:00
idle.h
init.h x86: move function and variable declarations to asm/init.h 2009-03-05 14:17:18 +01:00
intel_arch_perfmon.h
io_32.h Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/header-fixes', 'x86/headers' and 'x86/minor-fixes' into x86/core 2009-02-13 09:46:36 +01:00
io_64.h Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/header-fixes', 'x86/headers' and 'x86/minor-fixes' into x86/core 2009-02-13 09:46:36 +01:00
io_apic.h x86, apic: introduce io_apic_irq_attr 2009-05-18 08:38:55 +02:00
io.h x86: fix set_fixmap to use phys_addr_t 2009-04-10 20:27:13 +02:00
ioctl.h
ioctls.h
iomap.h Revert "gpu/drm, x86, PAT: PAT support for io_mapping_*" 2009-03-01 12:47:49 +01:00
iommu.h x86, ia64: convert to use generic dma_map_ops struct 2009-01-06 14:06:57 +01:00
ipcbuf.h
ipi.h x86, apic: remove duplicate asm/apic.h inclusions 2009-02-17 17:52:44 +01:00
irq_regs.h x86: merge irq_regs.h 2009-01-21 17:26:06 +09:00
irq_remapping.h x86: x2apic, IR: Clean up X86_X2APIC and INTR_REMAP config checks 2009-04-21 09:08:25 +02:00
irq_vectors.h x86, mce: define MCE_VECTOR 2009-06-03 14:48:05 -07:00
irq.h x86: UV, SGI RTC: add generic system vector 2009-03-04 20:25:37 +01:00
irqflags.h
ist.h
k8.h
Kbuild byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
kdebug.h
kexec.h x86, kexec: x86_64: add kexec jump support for x86_64 2009-03-10 18:13:25 -07:00
kgdb.h
kmap_types.h
kprobes.h
kvm_host.h KVM: Report IRQ injection status to userspace. 2009-03-24 11:03:11 +02:00
kvm_para.h
kvm_x86_emulate.h KVM: x86 emulator: add Src2 decode set 2008-12-31 16:55:42 +02:00
kvm.h KVM: Avoid using CONFIG_ in userspace visible headers 2009-03-24 11:03:06 +02:00
ldt.h
lguest_hcall.h lguest: fix guest crash on non-linear addresses in gdt pvops 2009-04-19 23:14:01 +09:30
lguest.h x86: cleanup some remaining usages of NR_CPUS where s/b nr_cpu_ids 2009-01-03 19:00:55 +01:00
linkage.h x86: shrink __ALIGN and __ALIGN_STR definitions 2009-03-11 12:39:28 +01:00
local.h
mach_timer.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
mach_traps.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
math_emu.h x86: fix math_emu register frame access 2009-02-10 00:39:14 +01:00
mc146818rtc.h
mca_dma.h
mca.h
mce.h x86, mce: support action-optional machine checks 2009-06-03 14:48:59 -07:00
microcode.h
mman.h
mmconfig.h
mmu_context.h x86: make lazy %gs optional on x86_32 2009-02-10 00:42:00 +01:00
mmu.h
mmx.h
mmzone_32.h bootmem, x86: further fixes for arch-specific bootmem wrapping 2009-03-01 16:06:56 +09:00
mmzone_64.h mm: clean up for early_pfn_to_nid() 2009-02-18 15:37:55 -08:00
mmzone.h
module.h
mpspec_def.h x86: rename all fields of mpf_intel mpf_X to X 2009-01-08 15:37:37 +01:00
mpspec.h x86: enable_update_mptable should be a macro 2009-05-28 01:59:05 +02:00
msgbuf.h
msidef.h x86, x2apic: enable fault handling for intr-remapping 2009-03-17 15:38:59 -07:00
msr-index.h x86, mce: Cleanup symbols in intel thermal codes 2009-05-28 09:24:11 -07:00
msr.h Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-28 12:21:10 -08:00
mtrr.h headers_check fix: x86, mtrr.h 2009-01-31 00:17:39 +05:30
mutex_32.h
mutex_64.h
mutex.h
nmi.h
nops.h
numa_32.h x86: set_highmem_pages_init() cleanup 2009-03-03 13:13:15 +01:00
numa_64.h
numa.h
numaq.h x86, numaq: cleanups 2009-02-05 22:30:14 +01:00
olpc.h
page_32_types.h x86-32: compute initial mapping size more accurately 2009-03-14 17:23:47 -07:00
page_32.h x86 headers: protect page_32.h via __ASSEMBLY__ 2009-02-13 13:36:47 +01:00
page_64_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -08:00
page_64.h x86: create _types.h counterparts for page*.h 2009-02-11 14:54:09 -08:00
page_types.h x86: clean up old gcc warnings 2009-03-05 14:50:55 +01:00
page.h x86 headers: include linux/types.h 2009-02-13 13:23:02 +01:00
param.h
paravirt.h x86: Fix performance regression caused by paravirt_ops on native kernels 2009-05-15 20:07:42 +02:00
parport.h
pat.h x86, PAT: Remove duplicate memtype reserve in devmem mmap 2009-04-10 13:55:48 +02:00
pci_64.h x86/dma: unify definition of pci_unmap_addr* and pci_unmap_len macros 2009-04-03 13:13:45 +02:00
pci_x86.h x86, pci: move arch/x86/pci/pci.h to arch/x86/include/asm/pci_x86.h 2008-12-29 18:17:36 +01:00
pci-direct.h
pci-functions.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
pci.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask 2009-04-05 10:33:07 -07:00
percpu.h x86: fix percpu_{to,from}_op() 2009-05-11 08:54:33 -07:00
pgalloc.h x86, mm: fix pte_free() 2009-01-23 18:42:06 +01:00
pgtable_32_types.h x86-32: use specific __vmalloc_start_set flag in __virt_addr_valid 2009-03-05 14:53:10 +01:00
pgtable_32.h x86-32: use brk segment for allocating initial kernel pagetable 2009-03-14 17:23:47 -07:00
pgtable_64_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -08:00
pgtable_64.h Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/header-fixes', 'x86/headers' and 'x86/minor-fixes' into x86/core 2009-02-13 09:46:36 +01:00
pgtable_types.h x86: move init_memory_mapping() to common mm/init.c, build fix on 32-bit PAE 2009-03-05 14:39:03 +01:00
pgtable-2level_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -08:00
pgtable-2level.h x86: with the last user gone, remove set_pte_present 2009-03-19 14:04:19 +01:00
pgtable-3level_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -08:00
pgtable-3level.h x86: with the last user gone, remove set_pte_present 2009-03-19 14:04:19 +01:00
pgtable.h x86: with the last user gone, remove set_pte_present 2009-03-19 14:04:19 +01:00
poll.h
posix_types_32.h
posix_types_64.h
posix_types.h
prctl.h headers_check fix: x86, prctl.h 2009-02-02 23:27:09 +05:30
processor-cyrix.h
processor-flags.h
processor.h x86: clean up and fix setup_clear/force_cpu_cap handling 2009-05-11 10:57:24 +02:00
proto.h x86/Voyager: remove X86_BIOS_REBOOT Kconfig quirk 2009-01-29 14:17:03 +01:00
ptrace-abi.h x86, ptrace: remove CONFIG guards around declarations 2009-02-24 18:23:35 +01:00
ptrace.h x86, 32-bit: fix kernel_trap_sp() 2009-05-12 00:39:52 +02:00
pvclock-abi.h
pvclock.h
rdc321x_defs.h x86, rdc321x: remove/move leftover files 2009-01-18 19:39:18 +01:00
reboot_fixups.h
reboot.h
required-features.h x86-64: remove PGE from must-have feature list 2009-04-08 11:51:46 -07:00
resource.h
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h
scatterlist.h
seccomp_32.h x86-64: seccomp: fix 32/64 syscall hole 2009-03-02 15:41:30 -08:00
seccomp_64.h x86-64: seccomp: fix 32/64 syscall hole 2009-03-02 15:41:30 -08:00
seccomp.h
sections.h x86: add brk allocation for very, very early allocations 2009-03-14 15:37:14 -07:00
segment.h x86: implement x86_32 stack protector 2009-02-10 00:42:01 +01:00
sembuf.h
serial.h
setup_arch.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
setup.h x86: move x86_quirk_pre_intr_init() to irqinit_32.c 2009-04-10 14:35:53 +02:00
shmbuf.h
shmparam.h
sigcontext32.h headers_check fix: x86, sigcontext32.h 2009-01-31 00:18:58 +05:30
sigcontext.h x86: add linux kernel support for YMM state 2009-04-12 13:08:56 +02:00
sigframe.h
siginfo.h
signal.h
smp.h x86: read apic ID in the !acpi_lapic case 2009-05-12 12:22:06 +02:00
smpboot_hooks.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
socket.h net: new user space API for time stamping of incoming and outgoing packets 2009-02-15 22:43:33 -08:00
sockios.h
sparsemem.h
spinlock_types.h
spinlock.h x86: Fix performance regression caused by paravirt_ops on native kernels 2009-05-15 20:07:42 +02:00
srat.h
stackprotector.h x86: fix x86_32 stack protector bugs 2009-02-11 11:33:49 +01:00
stacktrace.h
stat.h
statfs.h
string_32.h
string_64.h
string.h
suspend_32.h pm: cleanup includes 2009-04-01 08:59:16 -07:00
suspend_64.h
suspend.h
svm.h KVM: SVM: Move EFER and MSR constants to generic x86 code 2009-03-24 11:02:46 +02:00
swab.h headers_check fix: x86, swab.h 2009-01-31 00:19:32 +05:30
swiotlb.h swiotlb: replace architecture-specific swiotlb.h with linux/swiotlb.h 2008-12-28 10:04:00 +01:00
sync_bitops.h
sys_ia32.h generic compat_sys_ustat 2009-03-27 14:43:57 -04:00
syscall.h
syscalls.h x86: syscalls.h: remove asmlinkage from declaration of sys_rt_sigreturn() 2009-02-19 12:18:54 +01:00
system_64.h
system.h x86: add forward decl for tss_struct 2009-03-02 12:07:49 +01:00
tce.h
termbits.h
termios.h
therm_throt.h
thread_info.h tracing/x86: basic implementation of syscall tracing for x86 2009-03-13 06:25:44 +01:00
time.h
timer.h x86: fix mismerge in arch/x86/include/asm/timer.h 2009-03-30 10:10:49 -07:00
timex.h x86: use standard PIT frequency 2009-01-25 16:57:47 +01:00
tlb.h
tlbflush.h FRV: Fix the section attribute on UP DECLARE_PER_CPU() 2009-04-21 19:39:59 -07:00
topology.h x86/PCI: set_pci_bus_resources_arch_default cleanups 2009-04-22 14:47:46 -07:00
trampoline.h x86: load pointer to pda into %gs while brining up a CPU 2009-01-16 14:19:26 +01:00
traps.h x86: use pt_regs pointer in do_device_not_available() 2009-02-11 12:40:44 +01:00
tsc.h
types.h
uaccess_32.h x86, mm: dont use non-temporal stores in pagecache accesses 2009-03-02 11:06:49 +01:00
uaccess_64.h x86, mm: dont use non-temporal stores in pagecache accesses 2009-03-02 11:06:49 +01:00
uaccess.h x86: uaccess: use errret as error value in __put_user_size() 2009-02-04 17:28:21 -08:00
ucontext.h
unaligned.h
unistd_32.h preadv/pwritev: Add preadv and pwritev system calls. 2009-04-02 19:05:08 -07:00
unistd_64.h preadv/pwritev: Add preadv and pwritev system calls. 2009-04-02 19:05:08 -07:00
unistd.h
user32.h
user_32.h
user_64.h
user.h
vdso.h
vga.h
vgtod.h
virtext.h KVM: SVM: Move EFER and MSR constants to generic x86 code 2009-03-24 11:02:46 +02:00
vm86.h
vmi_time.h
vmi.h
vmware.h
vmx.h KVM: x86: Virtualize debug registers 2009-03-24 11:02:49 +02:00
vsyscall.h
xcr.h
xor_32.h
xor_64.h
xor.h
xsave.h x86: add linux kernel support for YMM state 2009-04-12 13:08:56 +02:00