From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xensource.com>
Subject: Re: [PATCH] [HVM] Prevent usb driver crashes in
 Windows
Date: Wed, 06 Jun 2007 19:22:45 +0100
Message-ID: <C28CBA05.10324%keir@xensource.com>
References: <4666E8F1.4020000@virtualiron.com>
Mime-Version: 1.0
Content-Type: text/plain;
	charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <4666E8F1.4020000@virtualiron.com>
List-Unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Steve Ofsthun <sofsthun@virtualiron.com>
Cc: xen-devel@lists.xensource.com, Ben Guthro <bguthro@virtualiron.com>
List-Id: xen-devel@lists.xenproject.org

On 6/6/07 18:03, "Steve Ofsthun" <sofsthun@virtualiron.com> wrote:

>> What precisely is the race? Qemu-dm is single threaded. Memcpy() probably
>> ends up doing int copies anyway if things are appropriately aligned
>> (although we might not want to rely on that).
> 
> The race is between a domU guest cpu running guest driver code and a dom0
> cpu running the timer based USB emulation code in QEMU.

I see. Thanks!

 -- Keir