> + case MSR_IA32_PEBS_ENABLE:
> + if (pmu->pebs_enable == data)
> + return 0;
> + if (!(data & pmu->pebs_enable_mask) &&
> + (data & MSR_IA32_PEBS_OUTPUT_MASK) ==
> + MSR_IA32_PEBS_OUTPUT_PT) {
> + pebs_enable_changed(pmu, data);
> + return 0;
> + }
Need #GP for bad values
