linux-kernel - Re: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU

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Message-ID: <ZhgYD4B1szpbvlHq@google.com>
Date: Thu, 11 Apr 2024 10:04:15 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Xiong Zhang <xiong.y.zhang@...ux.intel.com>
Cc: pbonzini@...hat.com, peterz@...radead.org, mizhang@...gle.com, 
	kan.liang@...el.com, zhenyuw@...ux.intel.com, dapeng1.mi@...ux.intel.com, 
	jmattson@...gle.com, kvm@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, zhiyuan.lv@...el.com, eranian@...gle.com, 
	irogers@...gle.com, samantha.alt@...el.com, like.xu.linux@...il.com, 
	chao.gao@...el.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH

On Fri, Jan 26, 2024, Xiong Zhang wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> 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+.