vcpu_get_perf_capabilities
ret = vcpu_get_perf_capabilities(vcpu) & PERF_CAP_PEBS_FORMAT;
perf_capabilities = vcpu_get_perf_capabilities(vcpu);
perf_capabilities = vcpu_get_perf_capabilities(vcpu);
return (vcpu_get_perf_capabilities(vcpu) & PERF_CAP_FW_WRITES) != 0;