linux-kernel - Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly

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Message-ID: <4C3FBCE0.3030402@cn.fujitsu.com>
Date:	Fri, 16 Jul 2010 09:58:56 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly

Marcelo Tosatti wrote:

>> It uses access bit to track both page accessed and page dirty, and it's rather cheap...
> 
> Xiao,
> 
> I don't understand it. What are you trying to achieve?
> 

Marcelo,

The issue which we try to fix in this patch is we mark the page dirty in speculative
path, i'm not sure that after Lai's patch this bug is gone, if it's true, this patch
is not needed anymore, otherwise the later patch is the cheaper way help us to fix this
issue.

In the later patch, we use pte.a to track whether the speculative mapping is accessed,
if it's accessed, we mark the page dirty, just like tracking page-accessed.

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