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

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Message-ID: <20190204161346.GC31598@tassilo.jf.intel.com>
Date:   Mon, 4 Feb 2019 08:13:46 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, bp@...en8.de,
        mingo@...hat.com, eranian@...gle.com
Subject: Re: [PATCH V6 2/5] perf/x86/kvm: Avoid unnecessary work in guest
 filtering

> As my understanding, the microcode version for each stepping is independent
> and irrelevant. The 0x0000004e should be just coincidence.
> If so, I don't think X86_STEPPING_ANY is very useful.
> 
> Andi, if I'm wrong please correct me.

Yes that's right. You cannot match microcode without stepping.

-Andi