linux-kernel - Re: [PATCH v6 07/16] KVM: x86/pmu: Reprogram PEBS event to emulate guest PEBS counter

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Date:   Tue, 18 May 2021 08:58:40 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     "Xu, Like" <like.xu@...el.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Like Xu <like.xu@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, weijiang.yang@...el.com,
        Kan Liang <kan.liang@...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
Subject: Re: [PATCH v6 07/16] KVM: x86/pmu: Reprogram PEBS event to emulate
 guest PEBS counter


>
> By "precdist", do you mean the"Precise Distribution of Instructions 
> Retired (PDIR) Facility"?


This was referring to perf's precise_ip field


>
> The SDM says Ice Lake Microarchitecture does support PEBS-PDIR on 
> IA32_FIXED0 only.
> And this patch kit enables it in the patch 0011, please take a look.
>
> Or do I miss something about precdist on ICL ?


On Icelake everything is fine

It just would need changes on other CPUs, but that can be done later.


-Andi