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 10:14:43 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Like Xu <like.xu.linux@...il.com>,
        Vitaly Kuznetsov <vkuznets@...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>
Subject: Re: [PATCH RESEND v12 00/17] KVM: x86/pmu: Add basic support to
 enable guest PEBS via DS

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.

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.

Paolo