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Date:   Mon, 8 Feb 2021 13:40:02 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Jim Mattson <jmattson@google.com>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org,
        pbonzini@redhat.com, Andi Kleen <ak@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH RESEND] perf/x86/kvm: Add Cascade Lake Xeon steppings to
 isolation_ucodes[]
Message-ID: <YCExIkeNU/g0GcCD@hirez.programming.kicks-ass.net>
References: <20210205191324.2889006-1-jmattson@google.com>
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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@google.com>

Thanks!