linux-kernel - Re: [PATCH 5/6] KVM: MMU: prefetch ptes when intercepted guest #PF

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Message-ID: <4C19E8E9.4060602@redhat.com>
Date:	Thu, 17 Jun 2010 12:20:41 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 5/6] KVM: MMU: prefetch ptes when intercepted guest #PF

On 06/17/2010 12:04 PM, Xiao Guangrong wrote:
>
>
>> So we can change the fault path to always fault 16 ptes, aligned on 16
>> pte boundary, with the needed pte called with specualtive=false.
>>      
> Avi, i not understand it clearly, Could you please explain it? :-(
>    

Right now if the fault is in spte i, you prefetch ptes 
(i+1)..(i+MAX_PREFETCH-1).  I'd like to prefetch ptes (i & 
~(MAX_PREFETCH-1))..(i | (MAX_PREFETCH - 1)).  Read all those gptes, and 
map them one by one with speculative = false only for spte i.

Perhaps we need to integrate it into walk_addr, there's  no reason to 
read the gptes twice.


-- 
error compiling committee.c: too many arguments to function

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