Re: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH

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Subject: Re: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Thu, 11 Apr 2024 10:04:15 -0700
Cc: pbonzini@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, mizhang@xxxxxxxxxx, kan.liang@xxxxxxxxx, zhenyuw@xxxxxxxxxxxxxxx, dapeng1.mi@xxxxxxxxxxxxxxx, jmattson@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, zhiyuan.lv@xxxxxxxxx, eranian@xxxxxxxxxx, irogers@xxxxxxxxxx, samantha.alt@xxxxxxxxx, like.xu.linux@xxxxxxxxx, chao.gao@xxxxxxxxx, Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
In-reply-to: <20240126085444.324918-2-xiong.y.zhang@linux.intel.com>
References: <20240126085444.324918-1-xiong.y.zhang@linux.intel.com> <20240126085444.324918-2-xiong.y.zhang@linux.intel.com>

On Fri, Jan 26, 2024, Xiong Zhang wrote:
> From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
> 
> Define and apply the PERF_PMU_CAP_VPMU_PASSTHROUGH flag for the version 4
> and later PMUs

Why?  I get that is an RFC, but it's not at all obvious to me why this needs to
take a dependency on v4+.

Follow-Ups:
- Re: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH
  - From: Liang, Kan

References:
- [RFC PATCH 00/41] KVM: x86/pmu: Introduce passthrough vPM
  - From: Xiong Zhang
- [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH
  - From: Xiong Zhang

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