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

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Date:   Mon, 12 Jul 2021 18:34:17 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Liuxiangdong <liuxiangdong5@...wei.com>, 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, linux-kernel@...r.kernel.org,
        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

On 12/7/2021 9:37 am, Liuxiangdong wrote:
> 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?
> 

I suggest we can enable more advanced PEBS features
after the basic support hits the mainline.

> 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
> 
>