linux-kernel - Re: [PATCH 2/3] KVM: MMU: don not retry #PF for nonpaging guest

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Message-ID: <4CD3BA50.1000002@cn.fujitsu.com>
Date:	Fri, 05 Nov 2010 16:03:28 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/3] KVM: MMU: don not retry #PF for nonpaging guest

On 11/05/2010 03:45 PM, Gleb Natapov wrote:

>>
>> It looks like something broken: apfs can generated in L2 guest (nested ntp guest)
>> and be retried in L1 guest.
>>
> Why is this a problem? apf will be generate on direct map even when L2
> guest is running so it should be OK to prefault it into direct map on
> completion.
> 

The nested_cr3 is different between L2 and L1, fix L2's page fault in L1's page table
is useless.
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