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: <60EB9CD8.6080608@huawei.com>
Date:   Mon, 12 Jul 2021 09:37:28 +0800
From:   Liuxiangdong <liuxiangdong5@...wei.com>
To:     <lingshan.zhu@...el.com>
CC:     <ak@...ux.intel.com>, <bp@...en8.de>, <eranian@...gle.com>,
        <jmattson@...gle.com>, <joro@...tes.org>,
        <kan.liang@...ux.intel.com>, <kvm@...r.kernel.org>,
        <like.xu.linux@...il.com>, <linux-kernel@...r.kernel.org>,
        <liuxiangdong5@...wei.com>, <pbonzini@...hat.com>,
        <peterz@...radead.org>, <seanjc@...gle.com>, <vkuznets@...hat.com>,
        <wanpengli@...cent.com>, <wei.w.wang@...el.com>,
        <weijiang.yang@...el.com>, <x86@...nel.org>,
        "Fangyi (Eric)" <eric.fangyi@...wei.com>,
        Xiexiangyou <xiexiangyou@...wei.com>
Subject: Re: [PATCH V7 00/18] KVM: x86/pmu: Add *basic* support to enable
 guest PEBS via DS

Hi， Lingshan.

We can use basic pebs for KVM Guest on ICX by this patches set. Will we 
consider supporting "perf mem" for KVM Guest?

AFAIK, the load latency facility requires processor supporting PEBS. 
Besides, it needs MSR_PEBS_LD_LAT_THRESHOLD
msr (3F6H) to specify the desired latency threshold. How about 
passthrough this msr to Guest?

Thanks!
Xiangdong Liu