linux-kernel - Re: [RFC PATCH 36/41] KVM: x86/pmu: Intercept FIXED_CTR

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Message-ID: <Zhhclu4VP3DDiPJM@google.com>
Date: Thu, 11 Apr 2024 14:56:38 -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, Xiong Zhang <xiong.y.zhang@...el.com>
Subject: Re: [RFC PATCH 36/41] KVM: x86/pmu: Intercept FIXED_CTR_CTRL MSR

On Fri, Jan 26, 2024, Xiong Zhang wrote:
> From: Xiong Zhang <xiong.y.zhang@...el.com>
> 
> Fixed counters control MSR are still intercepted for the purpose of
> security, i.e., preventing guest from using unallowed Fixed Counter
> to steal information or take advantages of any CPU errata.

Same comments as earlier patches.  Don't introduce bugs and then immediately fix
said bugs.