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

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Message-ID: <20100415090403.GA12697@8bytes.org>
Date:	Thu, 15 Apr 2010 11:04:03 +0200
From:	oerg Roedel <joro@...tes.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	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 Mon, Apr 15, 2030 at 04:57:38PM +0800, Zhang, Yanmin wrote:

> I checked svm.c and it seems svm.c doesn't trigger a NMI to host if the NMI
> happens in guest os. In addition, svm_complete_interrupts is called after
> interrupt is enabled.

Yes. The NMI is held pending by the hardware until the STGI instruction
is executed.
And for nested svm the svm_complete_interrupts function needs to be
executed after the nested exit handling. Therefore it is done late on
svm.

	Joerg

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