[PATCH v3 08/27] KVM: x86: Use KVM-governed feature framework to track "FRED enabled"

[Xin Li (Intel)]

From: Xin Li <xin3.li@xxxxxxxxx>

Track "FRED enabled" via a governed feature flag to avoid the guest
CPUID lookups at runtime.

Suggested-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
Signed-off-by: Xin Li (Intel) <xin@xxxxxxxxx>
Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
---
 arch/x86/kvm/governed_features.h | 1 +
 arch/x86/kvm/vmx/vmx.c           | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index ad463b1ed4e4..507ca73e52e9 100644
--- a/arch/x86/kvm/governed_features.h
+++ b/arch/x86/kvm/governed_features.h
@@ -17,6 +17,7 @@ KVM_GOVERNED_X86_FEATURE(PFTHRESHOLD)
 KVM_GOVERNED_X86_FEATURE(VGIF)
 KVM_GOVERNED_X86_FEATURE(VNMI)
 KVM_GOVERNED_X86_FEATURE(LAM)
+KVM_GOVERNED_X86_FEATURE(FRED)
 
 #undef KVM_GOVERNED_X86_FEATURE
 #undef KVM_GOVERNED_FEATURE
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index fee0df93e07c..9acc9661fdb2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7893,6 +7893,7 @@ void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 
 	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_VMX);
 	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_LAM);
+	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_FRED);
 
 	vmx_setup_uret_msrs(vmx);
 
-- 
2.46.2