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SubjectRe: [PATCH 0/2] KVM: VMX: Fix and test for emulation + exception
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On 12/29/21 00:24, Sean Christopherson wrote:
> Fix an issue that allows userspace to trigger a WARN by rejecting KVM_RUN
> if userspace attempts to run a vCPU that require emulation in KVM and has
> a pending exception, which is not supported in KVM.
>
> No small part of me thinks this is a waste of code and that we'd be better
> off just deleting the WARN. But it's also not hard to fix and there are
> still folks out there that run on Core2...
>
> Intentionally didn't tag for stable. I highly doubt this actually fixes
> anything for anyone, the goal is purely to prevent userspace from triggering
> the WARN.
>
> Sean Christopherson (2):
> KVM: VMX: Reject KVM_RUN if emulation is required with pending
> exception
> KVM: selftests: Add a test to force emulation with a pending exception
>
> arch/x86/include/asm/kvm-x86-ops.h | 1 +
> arch/x86/include/asm/kvm_host.h | 1 +
> arch/x86/kvm/svm/svm.c | 6 +
> arch/x86/kvm/vmx/vmx.c | 22 ++-
> arch/x86/kvm/x86.c | 12 +-
> tools/testing/selftests/kvm/.gitignore | 1 +
> tools/testing/selftests/kvm/Makefile | 1 +
> .../vmx_exception_with_invalid_guest_state.c | 139 ++++++++++++++++++
> 8 files changed, 178 insertions(+), 5 deletions(-)
> create mode 100644 tools/testing/selftests/kvm/x86_64/vmx_exception_with_invalid_guest_state.c
>

Queued, thanks.

Paolo

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