linux-kernel - Re: [PATCH RESEND] perf/x86/kvm: Add Cascade Lake Xeon steppings to isolation

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Message-ID: <YCExIkeNU/g0GcCD@hirez.programming.kicks-ass.net>
Date:   Mon, 8 Feb 2021 13:40:02 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, Andi Kleen <ak@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RESEND] perf/x86/kvm: Add Cascade Lake Xeon steppings to
 isolation_ucodes[]

On Fri, Feb 05, 2021 at 11:13:24AM -0800, Jim Mattson wrote:
> Cascade Lake Xeon parts have the same model number as Skylake Xeon
> parts, so they are tagged with the intel_pebs_isolation
> quirk. However, as with Skylake Xeon H0 stepping parts, the PEBS
> isolation issue is fixed in all microcode versions.
> 
> Add the Cascade Lake Xeon steppings (5, 6, and 7) to the
> isolation_ucodes[] table so that these parts benefit from Andi's
> optimization in commit 9b545c04abd4f ("perf/x86/kvm: Avoid unnecessary
> work in guest filtering").
> 
> Signed-off-by: Jim Mattson <jmattson@...gle.com>

Thanks!