[PATCH 0/2] kvm: split_lock: Fix emulator and extend #AC handler

[Xiaoyao Li]

As kernel split lock patch[1] merged into tip tree, kvm emulator needs to be
fixed and vmx's #AC handler needs to be extended.

Patch 1 fixes x86/emulator to emualte split lock access as write to avoid
malicous guest[2] exploiting it to populate host kernel log.

Patch 2 extends vmx's #AC handler that we can make old guestes (has split_lock
buges) survive on certain cases.

[1] 158031147976.396.8941798847364718785.tip-bot2@tip-bot2/">https://lore.kernel.org/lkml/158031147976.396.8941798847364718785.tip-bot2@tip-bot2/
[2] https://lore.kernel.org/lkml/8c5b11c9-58df-38e7-a514-dc12d687b198@xxxxxxxxxx/

Xiaoyao Li (2):
  KVM: x86: Emulate split-lock access as a write
  KVM: VMX: Extend VMX's #AC handding

 arch/x86/include/asm/cpu.h  | 13 ++++++++++++
 arch/x86/kernel/cpu/intel.c | 18 ++++++++++------
 arch/x86/kvm/vmx/vmx.c      | 42 ++++++++++++++++++++++++++++++++++---
 arch/x86/kvm/vmx/vmx.h      |  3 +++
 arch/x86/kvm/x86.c          | 11 ++++++++++
 5 files changed, 78 insertions(+), 9 deletions(-)

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2.23.0