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: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NMarkus Rechberger <markus.rechberger@amd.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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