linux-kernel - Re: [PATCH v6 5/9] KVM: MMU: introduce SPTE_MMU

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Message-ID: <20120611233212.GA29573@amt.cnet>
Date:	Mon, 11 Jun 2012 20:32:12 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v6 5/9] KVM: MMU: introduce SPTE_MMU_WRITEABLE bit

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? 

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