linux-kernel - Re: [RFC] para virt interface of perf to support kvm guest os statistics collection in guest os

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Date:	Thu, 10 Jun 2010 06:06:06 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	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>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	tim.c.chen@...el.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC] para virt interface of perf to support kvm guest os statistics
 collection in guest os

On 06/10/2010 05:21 AM, Zhang, Yanmin wrote:
>
>> I see.  So put it in a union.  Or perhaps not even in a union - what if
>> a kvm guest is also acting as a kvm host?
>>      
> My patch has consideration on it. I compiled kernel with host and guest support
> at the same time. The accessing to perf_event->shadow is really under specific
> scenarios, or they are just in specific functions. These functions are called
> just bu host kernel , or just by guest kernel.
>    

But a kernel can be both guest and host at the same time.  Currently 
this only works on AMD, but there was some work to bring it to Intel as 
well.


-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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