[PATCH 36/47] KVM: ignore reads from AMDs C1E enabled MSR

[Avi Kivity]

From: Andre Przywara <andre.przywara@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
 arch/x86/kvm/x86.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cae5b12..6aace61 100644
--- 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:
-- 
1.6.3.3

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