RE: [RFC v1 3/9] KVM: x86: Implement MSR_IA32_PEBS_ENABLE read/write emulation

[Kang, Luwei]

> > +	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

Yes, this function will return 1 if neither of above two conditions check are not true. And will inject a #GP to guest.

Thanks,
Luwei Kang