[PATCH v6 07/12] KVM: SVM: Add helper to query if LBR virtualization needs to be enabled

[Sean Christopherson <seanjc@google.com>]

Extract the logic for determining whether or not LBR virtualization needs
to be enabled into a helper in anticipation of growing the list of features
that depend on LBR virtualization.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/svm/svm.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 0eb1623052c1..775eccfb7b24 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -875,13 +875,22 @@ static void __svm_disable_lbrv(struct kvm_vcpu *vcpu)
 	to_svm(vcpu)->vmcb->control.misc_ctl2 &= ~SVM_MISC2_ENABLE_V_LBR;
 }
 
+static bool svm_need_lbr_virtualization(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_svm *svm = to_svm(vcpu);
+
+	if (svm->vmcb->save.dbgctl & DEBUGCTLMSR_LBR)
+		return true;
+
+	return is_guest_mode(vcpu) && guest_cpu_cap_has(vcpu, X86_FEATURE_LBRV) &&
+	       (svm->nested.ctl.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR);
+}
+
 void svm_update_lbrv(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 	bool current_enable_lbrv = svm->vmcb->control.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR;
-	bool enable_lbrv = (svm->vmcb->save.dbgctl & DEBUGCTLMSR_LBR) ||
-			    (is_guest_mode(vcpu) && guest_cpu_cap_has(vcpu, X86_FEATURE_LBRV) &&
-			    (svm->nested.ctl.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR));
+	bool enable_lbrv = svm_need_lbr_virtualization(vcpu);
 
 	if (enable_lbrv && !current_enable_lbrv)
 		__svm_enable_lbrv(vcpu);
-- 
2.56.0.rc1.315.gc6ed9934b7-goog