Re: [PATCH V6 2/5] perf/x86/kvm: Avoid unnecessary work in guest filtering

From: Borislav Petkov
Date: Mon Feb 04 2019 - 14:43:20 EST

On Mon, Feb 04, 2019 at 01:57:49PM -0500, Liang, Kan wrote:
> You mean a given microcode revision X applying to multiple stepping,
> right?

Yes, the range thing. You specify a range of steppings:

kabylake mobile with steppings 9-12
kabylake desktop with steppings 10-13

> I don't think so. I still think the KABYLAKE case is an uncommon case.

You mean it is uncommon because there are already *two* models which
need it or because this is only kabylake and it won't happen in the

> Can we do something as below just for this case?

Of course not. _FOUR is just silly and if a *fifth* stepping appears,
you need to go fixup again.

If anything and if this kabylake thing is one off, I'd prefer we keep it
as is.


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