From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: [PATCH v6 5/9] KVM: MMU: introduce SPTE_MMU_WRITEABLE bit
Date: Mon, 11 Jun 2012 20:32:12 -0300
Message-ID: <20120611233212.GA29573@amt.cnet>
References: <4FC470C7.5040700@linux.vnet.ibm.com>
 <4FC4716A.8030304@linux.vnet.ibm.com>
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Cc: Avi Kivity <avi@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
	KVM <kvm@vger.kernel.org>
To: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
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On Tue, May 29, 2012 at 02:49:14PM +0800, Xiao Guangrong wrote:
> This bit indicates whether the spte can be writable on MMU, that means
> the corresponding gpte is writable and the corresponding gfn is not
> protected by shadow page protection

Why is this still necessary, now that only sptes of direct shadow pages 
are updated locklessly?