Messages in this thread | | | Date | Thu, 23 Mar 2023 15:17:50 -0700 | Subject | Re: [PATCH 5/6] KVM: x86: Virtualize FLUSH_L1D and passthrough MSR_IA32_FLUSH_CMD | From | Sean Christopherson <> |
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On Wed, Mar 22, 2023, Pawan Gupta wrote: > On Tue, Mar 21, 2023 at 06:14:39PM -0700, Sean Christopherson wrote: > > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c > > index 85bb535fc321..b32edaf5a74b 100644 > > --- a/arch/x86/kvm/svm/svm.c > > +++ b/arch/x86/kvm/svm/svm.c > > @@ -95,6 +95,7 @@ static const struct svm_direct_access_msrs { > > #endif > > { .index = MSR_IA32_SPEC_CTRL, .always = false }, > > { .index = MSR_IA32_PRED_CMD, .always = false }, > > + { .index = MSR_IA32_FLUSH_CMD, .always = false }, > > { .index = MSR_IA32_LASTBRANCHFROMIP, .always = false }, > > { .index = MSR_IA32_LASTBRANCHTOIP, .always = false }, > > { .index = MSR_IA32_LASTINTFROMIP, .always = false }, > > @@ -4140,6 +4141,10 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) > > set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PRED_CMD, 0, > > !!guest_has_pred_cmd_msr(vcpu)); > > > > + if (boot_cpu_has(X86_FEATURE_FLUSH_L1D)) > > Just curious, will this ever be true on AMD hardware? AFAIK, > X86_FEATURE_FLUSH_L1D is Intel-defined CPU feature.
Don't know myself, but I assume/home there was actual motivation behind adding support for AMD.
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