linux-kernel - Re: [PATCH V7 00/18] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS

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Message-ID: <YN8La215i8i9T97s@hirez.programming.kicks-ass.net>
Date:   Fri, 2 Jul 2021 14:49:47 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Zhu Lingshan <lingshan.zhu@...el.com>
Cc:     pbonzini@...hat.com, bp@...en8.de, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, weijiang.yang@...el.com,
        kan.liang@...ux.intel.com, ak@...ux.intel.com,
        wei.w.wang@...el.com, eranian@...gle.com, liuxiangdong5@...wei.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        like.xu.linux@...il.com
Subject: Re: [PATCH V7 00/18] KVM: x86/pmu: Add *basic* support to enable
 guest PEBS via DS

On Tue, Jun 22, 2021 at 05:42:48PM +0800, Zhu Lingshan wrote:
> Like Xu (17):
>   perf/core: Use static_call to optimize perf_guest_info_callbacks
>   perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server
>   perf/x86/intel: Handle guest PEBS overflow PMI for KVM guest
>   perf/x86/core: Pass "struct kvm_pmu *" to determine the guest values
>   KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
>   KVM: x86/pmu: Introduce the ctrl_mask value for fixed counter
>   KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS
>   KVM: x86/pmu: Reprogram PEBS event to emulate guest PEBS counter
>   KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter
>   KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS
>   KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS
>   KVM: x86: Set PEBS_UNAVAIL in IA32_MISC_ENABLE when PEBS is enabled
>   KVM: x86/pmu: Move pmc_speculative_in_use() to arch/x86/kvm/pmu.h
>   KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations
>   KVM: x86/pmu: Add kvm_pmu_cap to optimize perf_get_x86_pmu_capability
>   KVM: x86/cpuid: Refactor host/guest CPU model consistency check
>   KVM: x86/pmu: Expose CPUIDs feature bits PDCM, DS, DTES64

Overall pretty decent, I send a couple of nits in reply to the
individual patches.