linux-kernel - Re: [PATCH v3 3/3] perf/x86/intel: Expose EPT-friendly PEBS for SPR and future models

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Date:   Mon, 14 Nov 2022 13:46:27 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Like Xu <like.xu.linux@...il.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [PATCH v3 3/3] perf/x86/intel: Expose EPT-friendly PEBS for SPR
 and future models

On Wed, Nov 09, 2022 at 04:28:02PM +0800, Like Xu wrote:
> From: Like Xu <likexu@...cent.com>
> 
> According to Intel SDM, the EPT-friendly PEBS is supported by all the
> platforms after ICX, ADL and the future platforms with PEBS format 5.
> 
> Currently the only in-kernel user of this capability is KVM, which has
> very limited support for hybrid core pmu, so ADL and its successors do
> not currently expose this capability. When both hybrid core and PEBS
> format 5 are present, KVM will decide on its own merits.

Oh right; the whole ADL KVM trainwreck :/ What's the plan there?

> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: linux-perf-users@...r.kernel.org
> Suggested-by: Kan Liang <kan.liang@...ux.intel.com>
> Signed-off-by: Like Xu <likexu@...cent.com>
> Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
> ---
> Nit: This change is proposed to be applied via the KVM tree.

Works for me;

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>