linux-kernel - Re: [PATCH V3] perf & kvm: Enhance perf to collect KVM guest os statistics from host side

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Date:	Tue, 20 Apr 2010 11:32:55 +0800
From:	Sheng Yang <sheng@...ux.intel.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Joerg Roedel <joro@...tes.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	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, Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH V3] perf & kvm: Enhance perf to collect KVM guest  os statistics from host side

On Monday 19 April 2010 16:25:17 Avi Kivity wrote:
> On 04/17/2010 09:12 PM, Avi Kivity wrote:
> > I think you were right the first time around.
> 
> Re-reading again (esp. the part about treatment of indirect NMI
> vmexits), I think this was wrong, and that the code is correct.  I am
> now thoroughly confused.
> 
My fault...

To my understanding now, "If an event causes a VM exit directly, it does not 
update architectural state as it would have if it had it not caused the VM 
exit:", means: in NMI case, NMI would involve the NMI handler, and change the 
"architectural state" to NMI block. In VMX non-root mode, the behavior of 
calling NMI handler changed(determine by some VMCS fields), but not the 
affection to the "architectural state". So the NMI block state would remain 
the same.

-- 
regards
Yang, Sheng
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