linux-kernel - Re: [PATCH v3 0/7] x86/pmu: Corner cases fixes and optimization

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Date:   Wed, 7 Sep 2022 17:52:07 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/7] x86/pmu: Corner cases fixes and optimization

A review reminder for shepherds. Thanks!

On 31/8/2022 4:53 pm, Like Xu wrote:
> Good well-designed tests can help us find more bugs, especially when
> the test steps differ from the Linux kernel behaviour in terms of the
> timing of access to virtualized hw resources.
> 
> Please feel free to run tests, add more or share comments.
> 
> Previous:
> https://lore.kernel.org/kvm/20220823093221.38075-1-likexu@tencent.com/
> 
> V2 RESEND -> V3 Changelog:
> - Post perf change as a separate patch to the perf folks; (Sean)
> - Rewrite the deferred logic using imperative mood; (Sean)
> - Drop some useless comment; (Sean)
> - Rename __reprogram_counter() to kvm_pmu_request_counter_reprogam(); (Sean)
> - Replace a play-by-play of the code changes with a high level description; (); (Sean)
> - Rename pmc->stale_counter to pmc->prev_counter; (Sean)
> - Drop an unnecessary check about pmc->prev_counter; (Sean)
> - Simply the code about "CTLn is even, CTRn is odd"; (Sean)
> - Refine commit message to avoid pronouns; (Sean)
> 
> Like Xu (7):
>    KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask
>    KVM: x86/pmu: Don't generate PEBS records for emulated instructions
>    KVM: x86/pmu: Avoid using PEBS perf_events for normal counters
>    KVM: x86/pmu: Defer reprogram_counter() to kvm_pmu_handle_event()
>    KVM: x86/pmu: Defer counter emulated overflow via pmc->prev_counter
>    KVM: x86/svm/pmu: Direct access pmu->gp_counter[] to implement
>      amd_*_to_pmc()
>    KVM: x86/svm/pmu: Rewrite get_gp_pmc_amd() for more counters
>      scalability
> 
>   arch/x86/include/asm/kvm_host.h |   6 +-
>   arch/x86/kvm/pmu.c              |  44 +++++++-----
>   arch/x86/kvm/pmu.h              |   6 +-
>   arch/x86/kvm/svm/pmu.c          | 121 ++++++--------------------------
>   arch/x86/kvm/vmx/pmu_intel.c    |  36 +++++-----
>   5 files changed, 75 insertions(+), 138 deletions(-)
>