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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2018-08-23 13:56:46 -0700 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2018-08-30 16:20:42 +0200 |
| commit | c4409905cd6eb42cfd06126e9226b0150e05a715 (patch) | |
| tree | d3677915aa1cad29cb819632547047d0847ac319 /arch/x86 | |
| parent | 0186ec823280f5db55ab2e6291933bebe2e92772 (diff) | |
| download | linux-c4409905cd6eb42cfd06126e9226b0150e05a715.tar.gz linux-c4409905cd6eb42cfd06126e9226b0150e05a715.tar.bz2 linux-c4409905cd6eb42cfd06126e9226b0150e05a715.zip | |
KVM: VMX: Do not allow reexecute_instruction() when skipping MMIO instr
Re-execution after an emulation decode failure is only intended to
handle a case where two or vCPUs race to write a shadowed page, i.e.
we should never re-execute an instruction as part of MMIO emulation.
As handle_ept_misconfig() is only used for MMIO emulation, it should
pass EMULTYPE_NO_REEXECUTE when using the emulator to skip an instr
in the fast-MMIO case where VM_EXIT_INSTRUCTION_LEN is invalid.
And because the cr2 value passed to x86_emulate_instruction() is only
destined for use when retrying or reexecuting, we can simply call
emulate_instruction().
Fixes: d391f1207067 ("x86/kvm/vmx: do not use vm-exit instruction length
for fast MMIO when running nested")
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 92f027745842..b345ad91809c 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7704,8 +7704,8 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu) if (!static_cpu_has(X86_FEATURE_HYPERVISOR)) return kvm_skip_emulated_instruction(vcpu); else - return x86_emulate_instruction(vcpu, gpa, EMULTYPE_SKIP, - NULL, 0) == EMULATE_DONE; + return emulate_instruction(vcpu, EMULTYPE_SKIP) == + EMULATE_DONE; } return kvm_mmu_page_fault(vcpu, gpa, PFERR_RSVD_MASK, NULL, 0); |