From: Joerg Roedel <[EMAIL PROTECTED]>
This lets SVM ignore writes of the value 0 to the performance counter control
registers. Thus enabling them will still fail in the guest, but a write of 0
which keeps them disabled is accepted. This is required to boot Windows
Vista 64bit.
[avi: avoid fall-thru in switch statement]
Signed-off-by: Joerg Roedel <[EMAIL PROTECTED]>
Signed-off-by: Markus Rechberger <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
drivers/kvm/svm.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 9f8564a..839a75f 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1155,7 +1155,20 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned
ecx, u64 data)
case MSR_IA32_SYSENTER_ESP:
svm->vmcb->save.sysenter_esp = data;
break;
+ case MSR_K7_EVNTSEL0:
+ case MSR_K7_EVNTSEL1:
+ case MSR_K7_EVNTSEL2:
+ case MSR_K7_EVNTSEL3:
+ /*
+ * only support writing 0 to the performance counters for now
+ * to make Windows happy. Should be replaced by a real
+ * performance counter emulation later.
+ */
+ if (data != 0)
+ goto unhandled;
+ break;
default:
+ unhandled:
return kvm_set_msr_common(vcpu, ecx, data);
}
return 0;
--
1.5.3.7
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