linux-kernel - Re: [PATCH v3 2/3] KVM: MMU: fix accessed bit set on prefault path

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Message-ID: <20101201204250.GA18395@amt.cnet>
Date:	Wed, 1 Dec 2010 18:42:50 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Gleb Natapov <gleb@...hat.com>, Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] KVM: MMU: fix accessed bit set on prefault path

On Wed, Dec 01, 2010 at 10:20:38AM +0800, Xiao Guangrong wrote:
> On 12/01/2010 03:20 AM, Gleb Natapov wrote:
> 
> > Firs of all if guest is PV the guest process cannot be killed. Second
> > why is it a problem that we marked pfn as accessed on speculative path?
> > What problem it causes especially since it is very likely that the page
> > will be accessed shortly anyway?
> > 
> 
> Hi Avi, Marcelo,
> 
> What is your opinion on this point?

Dont think this is an issue. Its very likely the page is going to be
accessed soon (unlike pte prefetch).

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