Re: [PATCH v1 7/8] KVM: x86: Expose PEBS feature to guest

[Peter Zijlstra]

On Wed, Oct 30, 2019 at 04:07:03AM +0000, Kang, Luwei wrote:
> > > Expose PEBS feature to guest by IA32_MISC_ENABLE[bit12].
> > > IA32_MISC_ENABLE[bit12] is Processor Event Based Sampling (PEBS)
> > > Unavailable (RO) flag:
> > > 1 = PEBS is not supported; 0 = PEBS is supported.
> > 
> > Why does it make sense to expose this on SVM?
> 
> Thanks for the review. This patch won't expose the pebs feature to SVM and return not supported.

AFAICT it exposes/emulates an Intel MSR on AMD, which is just weird.