linux-kernel - Re: [PATCH 1/2] KVM: MMU: allow more page become unsync at gfn mapping time

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Message-ID: <4BFA2760.5000508@cn.fujitsu.com>
Date:	Mon, 24 May 2010 15:14:40 +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 1/2] KVM: MMU: allow more page become unsync at gfn mapping
 time



Avi Kivity wrote:
> On 05/24/2010 05:03 AM, Xiao Guangrong wrote:
>>
>> Avi Kivity wrote:
>>
>>   
>>>> +    if (need_unsync)
>>>> +        kvm_unsync_pages(vcpu, gfn);
>>>>        return 0;
>>>>    }
>>>>
>>>>
>>>>        
>>> Looks good, I'm just uncertain about role.invalid handling.  What's the
>>> reasoning here?
>>>
>>>      
>> Avi,
>>
>> Thanks for your reply.
>>
>> We no need worry about 'role.invalid' here, since we only allow the
>> PTE shadow
>> pages(role.level == 1) become unsync, and in current code,
>> 'role.invalid' is only
>> used for root shadow pages.
>>    
> 
> Right, the invlpg change is not it yet.  But I think it should be in
> this patch; I don't like subtle dependencies, and it will make the
> invplg patch simpler.
> 

OK, i'll fix those two patches, thanks
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