linux/arch/x86/kvm
Huang Ying bf998156d2 KVM: Avoid killing userspace through guest SRAO MCE on unmapped pages
In common cases, guest SRAO MCE will cause corresponding poisoned page
be un-mapped and SIGBUS be sent to QEMU-KVM, then QEMU-KVM will relay
the MCE to guest OS.

But it is reported that if the poisoned page is accessed in guest
after unmapping and before MCE is relayed to guest OS, userspace will
be killed.

The reason is as follows. Because poisoned page has been un-mapped,
guest access will cause guest exit and kvm_mmu_page_fault will be
called. kvm_mmu_page_fault can not get the poisoned page for fault
address, so kernel and user space MMIO processing is tried in turn. In
user MMIO processing, poisoned page is accessed again, then userspace
is killed by force_sig_info.

To fix the bug, kvm_mmu_page_fault send HWPOISON signal to QEMU-KVM
and do not try kernel and user space MMIO processing for poisoned
page.

[xiao: fix warning introduced by avi]

Reported-by: Max Asbock <masbock@linux.vnet.ibm.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:26 +03:00
..
emulate.c KVM: fix emulator_task_switch() return value. 2010-05-17 12:17:49 +03:00
i8254.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
i8254.h KVM: Convert i8254/i8259 locks to raw_spinlocks 2010-03-01 12:36:12 -03:00
i8259.c KVM: x86: Kick VCPU outside PIC lock again 2010-04-25 12:39:28 +03:00
irq.c KVM: Remove irq_pending bitmap 2009-06-10 11:48:57 +03:00
irq.h KVM: x86: Kick VCPU outside PIC lock again 2010-04-25 12:39:28 +03:00
Kconfig Merge branch 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2010-03-05 13:12:34 -08:00
kvm_cache_regs.h KVM: Optimize kvm_read_cr[04]_bits() 2010-03-01 12:36:05 -03:00
kvm_timer.h KVM: arch/x86/kvm/kvm_timer.h checkpatch cleanup 2010-05-17 12:14:42 +03:00
lapic.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
lapic.h KVM: Add HYPER-V apic access MSRs 2010-03-01 12:36:00 -03:00
Makefile KVM: Move assigned device code to own file 2009-12-03 09:32:09 +02:00
mmu.c KVM: Avoid killing userspace through guest SRAO MCE on unmapped pages 2010-08-01 10:35:26 +03:00
mmu.h KVM: x86 emulator: fix memory access during x86 emulation 2010-03-01 12:36:11 -03:00
mmutrace.h KVM: MMU: convert mmu tracepoints 2010-05-19 11:36:26 +03:00
paging_tmpl.h KVM: Avoid killing userspace through guest SRAO MCE on unmapped pages 2010-08-01 10:35:26 +03:00
svm.c KVM: SVM: Implement workaround for Erratum 383 2010-06-09 18:47:20 +03:00
timer.c KVM: x86: document KVM_REQ_PENDING_TIMER usage 2010-05-17 12:16:40 +03:00
trace.h KVM: Trace emulated instructions 2010-05-17 12:17:35 +03:00
tss.h KVM: x86: hardware task switching support 2008-04-27 12:00:39 +03:00
vmx.c KVM: VMX: Fix host MSR_KERNEL_GS_BASE corruption 2010-07-06 11:41:31 +03:00
x86.c KVM: Use kmalloc() instead of vmalloc() for KVM_[GS]ET_MSR 2010-07-23 09:07:14 +03:00
x86.h KVM: use the correct RCU API for PROVE_RCU=y 2010-05-17 12:18:01 +03:00