linux-kernel - Re: [PATCH 0/2] Fix the duplicate PMI injections in vPMU

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Message-ID: <169567819674.170423.4384853980629356216.b4-ty@google.com>
Date:   Thu, 28 Sep 2023 09:41:54 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Mingwei Zhang <mizhang@...gle.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jim Mattson <jmattson@...gle.com>,
        Dapeng Mi <dapeng1.mi@...ux.intel.com>,
        Like Xu <likexu@...cent.com>, Roman Kagan <rkagan@...zon.de>,
        Kan Liang <kan.liang@...el.com>,
        Dapeng1 Mi <dapeng1.mi@...el.com>
Subject: Re: [PATCH 0/2] Fix the duplicate PMI injections in vPMU

On Mon, 25 Sep 2023 17:34:45 +0000, Mingwei Zhang wrote:
> When we do stress test on KVM vPMU using Intel vtune, we find the following
> warning kernel message in the guest VM:
> 
> [ 1437.487320] Uhhuh. NMI received for unknown reason 20 on CPU 3.
> [ 1437.487330] Dazed and confused, but trying to continue
> 
> The Problem
> ===========
> 
> [...]

Applied to kvm-x86 pmu, with the order swapped and a bit of changelog massaging.
Thanks!

[1/2] KVM: x86: Mask LVTPC when handling a PMI
      https://github.com/kvm-x86/linux/commit/a16eb25b09c0
[2/2] KVM: x86/pmu: Synthesize at most one PMI per VM-exit
      https://github.com/kvm-x86/linux/commit/73554b29bd70

--
https://github.com/kvm-x86/linux/tree/next