linux-kernel - Re: [PATCH V2 1/5] ara virt interface of perf to support kvm guest os statistics collection in guest os

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Date:	Tue, 22 Jun 2010 12:02:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Jes Sorensen <Jes.Sorensen@...hat.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>, Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	tim.c.chen@...el.com
Subject: Re: [PATCH V2 1/5] ara virt interface of perf to support kvm guest
 os statistics collection in guest os

On Tue, 2010-06-22 at 12:53 +0300, Avi Kivity wrote:


> > /me has no clue what virtual MSRs are,
> 
> MSRs that are not defined by the hardware, but instead by the
> hypervisor.
> 
Uhm, but the PMU MSRs are all defined by the hardware, if you move the
PMU MSRs around nothing will work.. *confusion*

> When emulating the hardware PMU we can be clever at times and allow 
> RDPMC not to trap. 

Sure, not disagreeing with that, still the generic case is to trap, so
lets first get that to work and then try and be smart :-)
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