linux-kernel - Re: [PATCH 1/2] KVM: MMU: don't make direct sp read-only if !map

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Message-ID: <4D05F62D.9040308@redhat.com>
Date:	Mon, 13 Dec 2010 12:32:13 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 1/2] KVM: MMU: don't make direct sp read-only if !map_writable

On 12/13/2010 12:31 PM, Xiao Guangrong wrote:
> Currently, if the page is not allowed to write, then it can drop
> ACC_WRITE_MASK in pte_access, and the direct sp's access is:
> 	gw->pt_access&  gw->pte_access
> so, it also removes the write access in the direct sp.
>
> There is a problem: if the access of those pages which map thought the same
> mapping in guest is different in host, it causes host switch direct sp very
> frequently.

I just sent a patch to fix this in a different way, please review it.

-- 
error compiling committee.c: too many arguments to function

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