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SubjectRe: [PATCH 0/2] KVM: x86: Emulate L2 triple fault without killing L1
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On 02/03/21 18:45, Sean Christopherson wrote:
> If KVM (L0) intercepts #GP, but L1 does not, then L2 can kill L1 by
> triggering triple fault. On both VMX and SVM, if the CPU hits a fault
> while vectoring an injected #DF (or I supposed any #DF), any intercept
> from the hypervisor takes priority over triple fault. #PF is unlikely to
> be intercepted by L0 but not L1. The bigger problem is #GP, which is
> intercepted on both VMX and SVM if enable_vmware_backdoor=1, and is also
> now intercepted for the lovely VMRUN/VMLOAD/VMSAVE errata.
>
> Based on kvm/queue, commit fe5f0041c026 ("KVM/SVM: Move vmenter.S exception
> fixups out of line"). x86.c and svm/nested.c conflict with kvm/master.
> They are minor and straighforward, but let me know if you want me to post
> a version based on kvm/master for easier inclusion into 5.12.

I think it would be too intrusive. Let's stick this in 5.13 only.

Paolo

> Sean Christopherson (2):
> KVM: x86: Handle triple fault in L2 without killing L1
> KVM: nSVM: Add helper to synthesize nested VM-Exit without collateral
>
> arch/x86/include/asm/kvm_host.h | 1 +
> arch/x86/kvm/lapic.c | 2 +-
> arch/x86/kvm/svm/nested.c | 57 ++++++++-------------------------
> arch/x86/kvm/svm/svm.c | 6 +---
> arch/x86/kvm/svm/svm.h | 9 ++++++
> arch/x86/kvm/vmx/nested.c | 9 ++++++
> arch/x86/kvm/x86.c | 29 +++++++++++++----
> arch/x86/kvm/x86.h | 2 ++
> 8 files changed, 60 insertions(+), 55 deletions(-)
>

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