Messages in this thread | | | Subject | Re: [PATCH 0/2] KVM: x86: Emulate L2 triple fault without killing L1 | From | Paolo Bonzini <> | Date | Tue, 2 Mar 2021 20:42:42 +0100 |
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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. > > 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(-) >
Queued, thanks.
Paolo
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