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

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Message-ID: <7b870e3a-e19a-0b05-68f7-db9eb852f061@gmail.com>
Date:   Mon, 19 Sep 2022 16:58:30 +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,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v3 0/7] x86/pmu: Corner cases fixes and optimization

+ Jim for more comments if any.

On 7/9/2022 5:52 pm, Like Xu wrote:
> 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(-)
>>