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

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Message-ID: <4C2F33BD.1030000@cn.fujitsu.com>
Date:	Sat, 03 Jul 2010 20:57:33 +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:

>> And this check is not sufficient, since it's only checked if the
>> mapping is zapped or not exist, for other words only when broken this
>> judgment:
>>     is_shadow_present_pte(*sptep)&&  !is_large_pte(*sptep)
>>
>> but if the middle level is present and it's not the large mapping,
>> this check is skipped.
>>    
> 
> 
> 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.
> 

Avi, sorry for my poor English, i not mean "everything was using small", i don't
know where cause you confused :-(





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