linux-kernel - Re: [PATCH v4 04/10] KVM/x86: intel_pmu_lbr

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Message-ID: <CALMp9eRPvxPCnAnWr8+U98PzZLQ8LzeBRMyPk0qROKBzSzSnRQ@mail.gmail.com>
Date:   Wed, 2 Jan 2019 15:26:56 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        like.xu@...el.com, Jann Horn <jannh@...gle.com>,
        arei.gonglei@...wei.com
Subject: Re: [PATCH v4 04/10] KVM/x86: intel_pmu_lbr_enable

On Wed, Dec 26, 2018 at 2:01 AM Wei Wang <wei.w.wang@...el.com> wrote:
>
> The lbr stack is architecturally specific, for example, SKX has 32 lbr
> stack entries while HSW has 16 entries, so a HSW guest running on a SKX
> machine may not get accurate perf results. Currently, we forbid the
> guest lbr enabling when the guest and host see different lbr stack
> entries.

How do you handle live migration?