linux-kernel - Re: [PATCH RESEND v12 00/17] KVM: x86/pmu: Add basic support to enable guest PEBS via DS

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Date:   Wed, 25 May 2022 16:32:36 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH RESEND v12 00/17] KVM: x86/pmu: Add basic support to
 enable guest PEBS via DS

On 25/5/2022 4:14 pm, Paolo Bonzini wrote:
> On 5/25/22 09:56, Like Xu wrote:
>> Thanks for the clarification.
>>
>> Some kvm x86 selftests have been failing due to this issue even after the last 
>> commit.
>>
>> I blame myself for not passing the msr_info->host_initiated to the 
>> intel_is_valid_msr(),
>> meanwhile I pondered further whether we should check only the MSR addrs range in
>> the kvm_pmu_is_valid_msr() and apply this kind of sanity check in the 
>> pmu_set/get_msr().
>>
>> Vitaly && Paolo, any preference to move forward ?
> 
> I'm not sure what I did wrong to not see the failure, so I'll fix it myself.

More info, some Skylake hosts fail the tests like x86_64/state_test due to this 
issue.

> 
> But from now on, I'll have a hard rule of no new processor features enabled 
> without KVM unit tests or selftests.  In fact, it would be nice if you wrote 
> some for PEBS.

Great, my team (or at least me) is committed to contributing more tests on vPMU 
features.

We may update the process document to the 
Documentation/virt/kvm/review-checklist.rst.

> 
> Paolo
>