Commit 62b9abaa authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity

KVM: SVM: support writing 0 to K8 performance counter control registers

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarMarkus Rechberger <markus.rechberger@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 722f6ecb
...@@ -1155,7 +1155,20 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) ...@@ -1155,7 +1155,20 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
case MSR_IA32_SYSENTER_ESP: case MSR_IA32_SYSENTER_ESP:
svm->vmcb->save.sysenter_esp = data; svm->vmcb->save.sysenter_esp = data;
break; 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: default:
unhandled:
return kvm_set_msr_common(vcpu, ecx, data); return kvm_set_msr_common(vcpu, ecx, data);
} }
return 0; return 0;
......
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