linux-kernel - Re: [PATCH RESEND v3 11/11] KVM: x86/pmu: Drop amd_event

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Date:   Fri, 20 May 2022 22:27:49 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH RESEND v3 11/11] KVM: x86/pmu: Drop amd_event_mapping[] in
 the KVM context

On 20/5/2022 8:59 pm, Paolo Bonzini wrote:
> On 5/18/22 15:25, Like Xu wrote:
>> +    if (static_call(kvm_x86_pmu_hw_event_is_unavail)(pmc))
>> +        return false;
>> +
> 
> I think it's clearer to make this positive and also not abbreviate the name; 
> that is, hw_event_available.

Indeed.

> 
> Apart from patch 3, the series looks good.  I'll probably delay it to 5.20 so 
> that you can confirm the SRCU issue, but it's queued.

I have checked it's protected under srcu_read_lock/unlock() for existing usages, 
so did JimM.

TBH, patch 3 is only inspired by the fact why the protection against 
kvm->arch.msr_filter
does not appear for kvm->arch.pmu_event_filter, and my limited searching scope 
has not
yet confirmed whether it prevents the same spider.

No comments on the target kernel cycle, Capt.

> 
> Thanks,
> 
> Paolo