linux-kernel - Re: [PATCH v2] KVM: x86: omit absent pmu MSRs from MSR list

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Message-ID: <CALMp9eSCB-wyLm-QYS-7gTcSeuWWCvgYL3iDEP0y6BM4cWMFag@mail.gmail.com>
Date:   Thu, 3 Oct 2019 11:23:21 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH v2] KVM: x86: omit absent pmu MSRs from MSR list

On Thu, Oct 3, 2019 at 10:38 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> On 03/10/19 19:20, Jim Mattson wrote:
> > You've truncated the list I originally provided, so I think this need
> > only go to MSR_ARCH_PERFMON_PERFCTR0 + 17. Otherwise, we could lose
> > some valuable MSRs.
>
> This is v2, so it was meant to replace the patch that truncates the
> list.  But I can include the other one too, perhaps even ask the x86
> maintainers about decreasing INTEL_PMC_MAX_GENERIC to 18.

The list should definitely be truncated, since
MSR_ARCH_PERFMON_EVENTSEL0 + 18 is IA32_PERF_STATUS.