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

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Message-ID: <d879b3a1-c5e8-00ba-4b80-e5da4dcceea7@redhat.com>
Date:   Thu, 3 Oct 2019 22:12:51 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jim Mattson <jmattson@...gle.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 03/10/19 20:23, Jim Mattson wrote:
> 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.

Ok, thanks.

Paolo