linux-kernel - Re: [PATCH 6/10] KVM MMU: don't write-protect if have new mapping to unsync page

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Message-ID: <4BD1860E.7000103@redhat.com>
Date:	Fri, 23 Apr 2010 14:35:42 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/10] KVM MMU: don't write-protect if have new mapping
 to unsync page

On 04/22/2010 09:13 AM, Xiao Guangrong wrote:
> If have new mapping to the unsync page(i.e, add a new parent), just
> update the page from sp->gfn but not write-protect gfn, and if need
> create new shadow page form sp->gfn, we should sync it
>    

Sorry, I don't understand this patch.  Can you clarify?  for example, 
the situation before adding the new parent, what the guest action was, 
and the new situation.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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