KVM: do not #GP on perf MSR writes when vPMU is disabled
Return to behaviour perf MSR had before introducing vPMU in case vPMU is disabled. Some guests access those registers unconditionally and do not expect it to fail. Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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