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

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Message-ID: <4C2EF00A.2090406@cn.fujitsu.com>
Date:	Sat, 03 Jul 2010 16:08:42 +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:

>> +
>> +		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. :-)
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