KVM: x86: move MSR_IA32_POWER_CTL handling to common code

Make it available to AMD hosts as well, just in case someone is trying
to use an Intel processor's CPUID setup.
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -689,6 +689,7 @@ struct kvm_vcpu_arch {
 	u32 virtual_tsc_mult;
 	u32 virtual_tsc_khz;
 	s64 ia32_tsc_adjust_msr;
+	u64 msr_ia32_power_ctl;
 	u64 tsc_scaling_ratio;
 
 	atomic_t nmi_queued;  /* unprocessed asynchronous NMIs */

arch/x86/kvm/vmx/vmx.c

@@ -1695,9 +1695,6 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	case MSR_IA32_SYSENTER_ESP:
 		msr_info->data = vmcs_readl(GUEST_SYSENTER_ESP);
 		break;
-	case MSR_IA32_POWER_CTL:
-		msr_info->data = vmx->msr_ia32_power_ctl;
-		break;
 	case MSR_IA32_BNDCFGS:
 		if (!kvm_mpx_supported() ||
 		    (!msr_info->host_initiated &&
@@ -1828,9 +1825,6 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	case MSR_IA32_SYSENTER_ESP:
 		vmcs_writel(GUEST_SYSENTER_ESP, data);
 		break;
-	case MSR_IA32_POWER_CTL:
-		vmx->msr_ia32_power_ctl = data;
-		break;
 	case MSR_IA32_BNDCFGS:
 		if (!kvm_mpx_supported() ||
 		    (!msr_info->host_initiated &&

arch/x86/kvm/vmx/vmx.h

@@ -260,8 +260,6 @@ struct vcpu_vmx {
 
 	unsigned long host_debugctlmsr;
 
-	u64 msr_ia32_power_ctl;
-
 	/*
 	 * Only bits masked by msr_ia32_feature_control_valid_bits can be set in
 	 * msr_ia32_feature_control. FEATURE_CONTROL_LOCKED is always included

arch/x86/kvm/x86.c

@@ -2563,6 +2563,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 			return 1;
 		vcpu->arch.smbase = data;
 		break;
+	case MSR_IA32_POWER_CTL:
+		vcpu->arch.msr_ia32_power_ctl = data;
+		break;
 	case MSR_IA32_TSC:
 		kvm_write_tsc(vcpu, msr_info);
 		break;
@@ -2822,6 +2825,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 			return 1;
 		msr_info->data = vcpu->arch.arch_capabilities;
 		break;
+	case MSR_IA32_POWER_CTL:
+		msr_info->data = vcpu->arch.msr_ia32_power_ctl;
+		break;
 	case MSR_IA32_TSC:
 		msr_info->data = kvm_scale_tsc(vcpu, rdtsc()) + vcpu->arch.tsc_offset;
 		break;