linux-kernel - Re: [PATCH v2 1/7] KVM: MMU: optimize pte write path if don't have protected sp

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Message-ID: <20110518131247.GA10833@amt.cnet>
Date:	Wed, 18 May 2011 10:12:47 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 1/7] KVM: MMU: optimize pte write path if don't have
 protected sp

On Mon, May 16, 2011 at 02:25:02PM +0300, Avi Kivity wrote:
> On 05/15/2011 06:20 PM, Xiao Guangrong wrote:
> >Simply return from kvm_mmu_pte_write path if no shadow page is
> >write-protected, then we can avoid to walk all shadow pages and hold
> >mmu-lock
> 
> Patchset looks like a very good cleanup (plus the nice optimization
> in patch 1).

What case is patch 1 optimizing for?

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