linux-kernel - Re: [PATCH v4 5/6] KVM: MMU: combine guest pte read between walk and pte prefetch

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Message-ID: <4C2F3527.3020307@cn.fujitsu.com>
Date:	Sat, 03 Jul 2010 21:03:35 +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 list <kvm@...r.kernel.org>
Subject: Re: [PATCH v4 5/6] KVM: MMU: combine guest pte read between walk
 and pte prefetch



Avi Kivity wrote:

>>
>>
>> Well, in the description, it looked like everything was using small
>> pages (in kvm, level=1 means PTE level, we need to change this one
>> day).  Please describe again and say exactly when the guest or host
>> uses large pages.
>>
>>
> 
> Oh, I see what you mean.
> 
> Regarding the patch, is it possible just to move the check before,
> instead of adding the 'check' variable?
> 

Umm, if we move the check before the judgment, it'll check every level,
actually, only the opened mapping and the laster level need checked, so
for the performance reason, maybe it's better to keep two check-point.

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