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Date:   Wed, 6 Dec 2017 07:57:28 -0800
From:   Andi Kleen <>
To:     Jan Dakinevich <>
        "Denis V . Lunev" <>,
        Roman Kagan <>,
        Peter Zijlstra <>,
        Ingo Molnar <>,
        Arnaldo Carvalho de Melo <>,
        Alexander Shishkin <>,
        Jiri Olsa <>,
        Namhyung Kim <>,
        Thomas Gleixner <>,
        "H. Peter Anvin" <>,,
        Paolo Bonzini <>,
        Radim Krčmář <>,
        Kan Liang <>,
        Stephane Eranian <>,
        Colin King <>,
        Sebastian Andrzej Siewior <>,
        Jin Yao <>,
Subject: Re: [PATCH RFC 2/2] KVM: x86/vPMU: ignore access to LBR-related MSRs

If you do all this it's only a small step to fully enable LBRs for guests. 

Just need to allow them to be written, expose PERF_CAPABILITIES too, and
start/stop them on entry/exit, and enable context switching through perf in
the host.

That would be far better than creating a frankenstate where LBR is there but
mostly broken on some KVM versions.


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