linux-kernel - Re: [PATCH v4 4/6] KVM: MMU: prefetch ptes when intercepted guest #PF

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Message-ID: <4C327DBA.9020309@cn.fujitsu.com>
Date:	Tue, 06 Jul 2010 08:50:02 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH v4 4/6] KVM: MMU: prefetch ptes when intercepted guest
 #PF



Marcelo Tosatti wrote:
> On Sat, Jul 03, 2010 at 04:08:42PM +0800, Xiao Guangrong wrote:
>>
>> Marcelo Tosatti wrote:
>>
>>>> +
>>>> +		if (is_rsvd_bits_set(vcpu, gpte, PT_PAGE_TABLE_LEVEL))
>>>> +			break;
>>> BTW, doesnt sync_page also lack reserved bit checking? (unrelated to
>>> this patch).
>>>
>> I think it's not since if EPT is enabled, no unsync page exist, the sync page
>> path can't be trigged. :-)
> 
> What i mean is, why the sync_page path does not require reserved bit
> checking? (EPT disabled).
> 

Oh, i think we should check it, i'll post a patch to fix it.
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