[PATCH] discard MSR writes

["Markus Rechberger" <markus.rechberger-5C7GfCeVMHo@public.gmane.org>]

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this patch discards MSR writes to the Performance Event-Select 
Registers, this is the first issue why vista seems to fail although now 
vista ends up in an endless loop a bit later.
Qemu currently also discards those writes.

Signed-off-by: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
Signed-off-by: Markus Rechberger <markus.rechberger-5C7GfCeVMHo@public.gmane.org>

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diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 1c3cc3e..1f34501 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1143,6 +1143,12 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
 	case MSR_SYSCALL_MASK:
 		svm->vmcb->save.sfmask = data;
 		break;
+	case MSR_K7_EVNTSEL0:
+	case MSR_K7_EVNTSEL1:
+	case MSR_K7_EVNTSEL2:
+	case MSR_K7_EVNTSEL3:
+		/* discard those writes for now, required by vista 64bit */
+		break;
 #endif
 	case MSR_IA32_SYSENTER_CS:
 		svm->vmcb->save.sysenter_cs = data;

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