Messages in this thread | | | Date | Mon, 21 Nov 2022 16:33:41 +0000 | From | Liam Merwick <> | Subject | Re: [PATCH v2 7/9] KVM: x86: allow L1 to not intercept triple fault |
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On 03/11/2022 14:13, Maxim Levitsky wrote: > This is SVM correctness fix - although a sane L1 would intercept > SHUTDOWN event, it doesn't have to, so we have to honour this. > > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> > --- > arch/x86/kvm/svm/nested.c | 6 ++++++ > arch/x86/kvm/vmx/nested.c | 1 + > arch/x86/kvm/x86.c | 11 ++++++----- > 3 files changed, 13 insertions(+), 5 deletions(-) > > diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c > index bcc4f6620f8aec..3aa9184d1e4ed7 100644 > --- a/arch/x86/kvm/svm/nested.c > +++ b/arch/x86/kvm/svm/nested.c > @@ -1092,6 +1092,12 @@ int nested_svm_vmexit(struct vcpu_svm *svm) > > static void nested_svm_triple_fault(struct kvm_vcpu *vcpu) > { > + struct vcpu_svm *svm = to_svm(vcpu); > + > + if (!vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_SHUTDOWN)) > + return; > + > + kvm_clear_request(KVM_REQ_TRIPLE_FAULT, vcpu); > nested_svm_simple_vmexit(to_svm(vcpu), SVM_EXIT_SHUTDOWN);
You could replace 'to_svm(vcpu)' with 'svm' here But LGTM either way.
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
> } > > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c > index 1ebe141a0a015f..7924dea9367813 100644 > --- a/arch/x86/kvm/vmx/nested.c > +++ b/arch/x86/kvm/vmx/nested.c > @@ -4855,6 +4855,7 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason, > > static void nested_vmx_triple_fault(struct kvm_vcpu *vcpu) > { > + kvm_clear_request(KVM_REQ_TRIPLE_FAULT, vcpu); > nested_vmx_vmexit(vcpu, EXIT_REASON_TRIPLE_FAULT, 0, 0); > } > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 3fd900504e683b..f0a0102a78f5c3 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -9741,7 +9741,7 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu) > > int kvm_check_nested_events(struct kvm_vcpu *vcpu) > { > - if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { > + if (kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { > kvm_x86_ops.nested_ops->triple_fault(vcpu); > return 1; > } > @@ -10255,15 +10255,16 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) > r = 0; > goto out; > } > - if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { > - if (is_guest_mode(vcpu)) { > + if (kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { > + if (is_guest_mode(vcpu)) > kvm_x86_ops.nested_ops->triple_fault(vcpu); > - } else { > + > + if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { > vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; > vcpu->mmio_needed = 0; > r = 0; > - goto out; > } > + goto out; > } > if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { > /* Page is swapped out. Do synthetic halt */
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