KVM: x86: Handle PERF_CAPABILITIES in common x86's kvm_get_msr_feature()

Handle PERF_CAPABILITIES directly in kvm_get_msr_feature() now that the
supported value is available in kvm_caps.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221006000314.73240-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm/svm.c

@@ -2713,9 +2713,6 @@ static int svm_get_msr_feature(struct kvm_msr_entry *msr)
 		if (boot_cpu_has(X86_FEATURE_LFENCE_RDTSC))
 			msr->data |= MSR_F10H_DECFG_LFENCE_SERIALIZE;
 		break;
-	case MSR_IA32_PERF_CAPABILITIES:
-		msr->data = kvm_caps.supported_perf_cap;
-		return 0;
 	default:
 		return KVM_MSR_RET_INVALID;
 	}

arch/x86/kvm/vmx/vmx.c

@@ -1849,9 +1849,6 @@ static int vmx_get_msr_feature(struct kvm_msr_entry *msr)
 		if (!nested)
 			return 1;
 		return vmx_get_vmx_msr(&vmcs_config.nested, msr->index, &msr->data);
-	case MSR_IA32_PERF_CAPABILITIES:
-		msr->data = kvm_caps.supported_perf_cap;
-		return 0;
 	default:
 		return KVM_MSR_RET_INVALID;
 	}

arch/x86/kvm/x86.c

@@ -1648,6 +1648,9 @@ static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
 	case MSR_IA32_ARCH_CAPABILITIES:
 		msr->data = kvm_get_arch_capabilities();
 		break;
+	case MSR_IA32_PERF_CAPABILITIES:
+		msr->data = kvm_caps.supported_perf_cap;
+		break;
 	case MSR_IA32_UCODE_REV:
 		rdmsrl_safe(msr->index, &msr->data);
 		break;