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charset="utf-8" Set the FRED_VIRT_ENABLE bit (bit 4) in the VIRT_EXT field of VMCB to enable FRED Virtualization for the guest. This enables automatic save/restore of FRED MSRs. Signed-off-by: Shivansh Dhiman --- Changes in v2: - Confined the enabling of vFRED to svm_vcpu_after_set_cpuid() only (Sean Christopherson). --- arch/x86/include/asm/svm.h | 1 + arch/x86/kvm/svm/svm.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index c0f6523e2b2d..f4a9781c1d6c 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -224,6 +224,7 @@ struct __attribute__ ((__packed__)) vmcb_control_area { =20 #define LBR_CTL_ENABLE_MASK BIT_ULL(0) #define VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK BIT_ULL(1) +#define FRED_VIRT_ENABLE_MASK BIT_ULL(4) =20 #define SVM_INTERRUPT_SHADOW_MASK BIT_ULL(0) #define SVM_GUEST_INTERRUPT_MASK BIT_ULL(1) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 7d411df3dd78..4b270490b2fd 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4540,6 +4540,11 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu= *vcpu) if (guest_cpuid_is_intel_compatible(vcpu)) guest_cpu_cap_clear(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD); + if (guest_cpu_cap_has(vcpu, X86_FEATURE_FRED)) + svm->vmcb->control.virt_ext |=3D FRED_VIRT_ENABLE_MASK; + else + svm->vmcb->control.virt_ext &=3D ~FRED_VIRT_ENABLE_MASK; + if (sev_guest(vcpu->kvm)) sev_vcpu_after_set_cpuid(svm); } --=20 2.43.0