linux-kernel - Re: [PATCH v2 0/6] KVM: x86/pmu: Clean up emulated PMC event handling

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Message-ID: <170137839352.665680.16618790592517929019.b4-ty@google.com>
Date:   Thu, 30 Nov 2023 17:52:24 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dapeng Mi <dapeng1.mi@...ux.intel.com>,
        Mingwei Zhang <mizhang@...gle.com>,
        Roman Kagan <rkagan@...zon.de>,
        Jim Mattson <jmattson@...gle.com>,
        Like Xu <like.xu.linux@...il.com>
Subject: Re: [PATCH v2 0/6] KVM: x86/pmu: Clean up emulated PMC event handling

On Fri, 03 Nov 2023 16:05:35 -0700, Sean Christopherson wrote:
> The ultimate goal of this series is to track emulated counter events using
> a dedicated variable instead of trying to track the previous counter value.
> Tracking the previous counter value is flawed as it takes a snapshot at
> every emulated event, but only checks for overflow prior to VM-Enter, i.e.
> KVM could miss an overflow if KVM ever supports emulating event types that
> can occur multiple times in a single VM-Exit.
> 
> [...]

Applied to kvm-x86 pmu, thanks!

[1/6] KVM: x86/pmu: Move PMU reset logic to common x86 code
      https://github.com/kvm-x86/linux/commit/cbb359d81a26
[2/6] KVM: x86/pmu: Reset the PMU, i.e. stop counters, before refreshing
      https://github.com/kvm-x86/linux/commit/1647b52757d5
[3/6] KVM: x86/pmu: Stop calling kvm_pmu_reset() at RESET (it's redundant)
      https://github.com/kvm-x86/linux/commit/f2f63f7ec6fd
[4/6] KVM: x86/pmu: Remove manual clearing of fields in kvm_pmu_init()
      https://github.com/kvm-x86/linux/commit/ec61b2306dfd
[5/6] KVM: x86/pmu: Update sample period in pmc_write_counter()
      https://github.com/kvm-x86/linux/commit/89acf1237b81
[6/6] KVM: x86/pmu: Track emulated counter events instead of previous counter
      https://github.com/kvm-x86/linux/commit/fd89499a5151

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