KVM: ignore reads from AMDs C1E enabled MSR

If the Linux kernel detects an C1E capable AMD processor (K8 RevF and
higher), it will access a certain MSR on every attempt to go to halt.
Explicitly handle this read and return 0 to let KVM run a Linux guest
with the native AMD host CPU propagated to the guest.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cae5b12bf93856f60a1345e5e258247eb8026060..6aace61fdb62d36c8482b4e52446a7621a35070f 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1038,6 +1038,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
        case MSR_P6_EVNTSEL0:
        case MSR_P6_EVNTSEL1:
        case MSR_K7_EVNTSEL0:
+       case MSR_K8_INT_PENDING_MSG:
                data = 0;
                break;
        case MSR_MTRRcap: