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authorJoerg Roedel <joerg.roedel@amd.com>2007-12-11 15:36:57 +0100
committerAvi Kivity <avi@qumranet.com>2008-01-30 17:53:22 +0200
commit62b9abaaf8423a3a38b938831b3b8431a6607ad8 (patch)
tree1518309462bb5d730b09f2d595f47998514fe37c
parent722f6ecbcf3e53809236b36e6dfd9042924a2d51 (diff)
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: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Markus Rechberger <markus.rechberger@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--drivers/kvm/svm.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 442ca818c5a..ef21804a5c5 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;