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On 12/20/2024 6:31 AM, Sean Christopherson wrote: > On Tue, Oct 22, 2024, Manali Shukla wrote: >> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c >> index d5314cb7dff4..feb241110f1a 100644 >> --- a/arch/x86/kvm/svm/nested.c >> +++ b/arch/x86/kvm/svm/nested.c >> @@ -178,6 +178,14 @@ void recalc_intercepts(struct vcpu_svm *svm) >> } else { >> WARN_ON(!(c->virt_ext & VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK)); >> } >> + >> + /* >> + * Clear the HLT intercept for L2 guest when the Idle HLT intercept feature >> + * is enabled on the platform and the guest can use the Idle HLT intercept >> + * feature. >> + */ >> + if (guest_can_use(&svm->vcpu, X86_FEATURE_IDLE_HLT)) >> + vmcb_clr_intercept(c, INTERCEPT_HLT); > > This is wrong. KVM needs to honor the intercept of vmcb12. If L1 wants to > intercept HLT, then KVM needs to configure vmcb02 to intercept HLT, regradless > of whether or not L1 is utilizing INTERCEPT_IDLE_HLT. > > Given how KVM currently handles intercepts for nested SVM, I'm pretty sure you > can simply do nothing. recalc_intercepts() starts with KVM's intercepts (from > vmcb01), and adds in L1's intercepts. So unless there is a special case, the > default behavior should Just Work. > > for (i = 0; i < MAX_INTERCEPT; i++) > c->intercepts[i] = h->intercepts[i]; > > ... > > for (i = 0; i < MAX_INTERCEPT; i++) > c->intercepts[i] |= g->intercepts[i]; > > KVM's approach creates all kinds of virtualization holes, e.g. L1 can utilize > IDLE_HLT even if the feature isn't advertised to L1. But that's true for quite > literally all feature-based intercepts, so for better or worse, I don't think > it makes sense to try and change that approach for this feature. > Yeah. Makes sense. I will remove the above condition from V5, so that intercept of vmcb12 is honored. >> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c >> index e86b79e975d3..38d546788fc6 100644 >> --- a/arch/x86/kvm/svm/svm.c >> +++ b/arch/x86/kvm/svm/svm.c >> @@ -4425,6 +4425,7 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) >> kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_PFTHRESHOLD); >> kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_VGIF); >> kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_VNMI); >> + kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_IDLE_HLT); >> >> svm_recalc_instruction_intercepts(vcpu, svm); >> >> @@ -5228,6 +5229,9 @@ static __init void svm_set_cpu_caps(void) >> if (vnmi) >> kvm_cpu_cap_set(X86_FEATURE_VNMI); >> >> + if (cpu_feature_enabled(X86_FEATURE_IDLE_HLT)) >> + kvm_cpu_cap_set(X86_FEATURE_IDLE_HLT); > > kvm_cpu_cap_check_and_set() does this for you. > >> + >> /* Nested VM can receive #VMEXIT instead of triggering #GP */ >> kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK); >> } >> -- >> 2.34.1 >> - Manali