KVM: SVM: Allow read access to MSR_VM_VR

KVM tries to read the VM_CR MSR to find out if SVM was disabled by
the BIOS. So implement read support for this MSR to make nested
SVM running.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/svm.c

@@ -1869,6 +1869,9 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
 	case MSR_VM_HSAVE_PA:
 		*data = svm->hsave_msr;
 		break;
+	case MSR_VM_CR:
+		*data = 0;
+		break;
 	default:
 		return kvm_get_msr_common(vcpu, ecx, data);
 	}