From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 1/7] KVM: MMU: optimize pte write path if don't have protected
 sp
Date: Sun, 15 May 2011 11:38:29 +0300
Message-ID: <4DCF9105.4020000@redhat.com>
References: <4DCEF5B1.3050706@cn.fujitsu.com> <4DCF8CBC.1040602@redhat.com> <4DCF8FC6.8050600@cn.fujitsu.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
To: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <4DCF8FC6.8050600@cn.fujitsu.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On 05/15/2011 11:33 AM, Xiao Guangrong wrote:
> >
> >  These atomic ops are always called from within the spinlock, so we don't need an atomic_t here.
> >
> >  Sorry, I should have noticed this on the first version.
>
> We read indirect_shadow_pages atomically on pte write path, that is allowed out of mmu_lock

Reading is fine:

   #define atomic_read(v)    (*(volatile int *)&(v)->counter)

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