linux-kernel - Re: [PATCH 1/4] KVM: MMU: don't drop spte if overwrite it from W to RO

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Message-ID: <4CE0C660.5000109@cn.fujitsu.com>
Date:	Mon, 15 Nov 2010 13:34:24 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 1/4] KVM: MMU: don't drop spte if overwrite it from W
 to RO

On 11/14/2010 06:52 PM, Avi Kivity wrote:
> On 11/12/2010 12:30 PM, Xiao Guangrong wrote:
>> We just need flush tlb if overwrite a writable spte with a read-only one
>>
> 
> What are the advantages?  Avoid playing with rmap, and avoid a window
> where the spte is missing?
> 

Both, but only the first was in my mind when i'm making the patch :-)
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