From mboxrd@z Thu Jan  1 00:00:00 1970
From: Randy <randy.han@gmail.com>
Subject: Question: block device for HVM
Date: Tue, 22 Feb 2011 15:14:50 +0800
Message-ID: <4D63626A.7030507@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
List-Unsubscribe: <http://lists.xensource.com/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/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: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

Hi all,

I want to get the statistics of block device of HVM. I found xen created 
a vbd (/sys/bus/xen-backend/devices/vbd-1-768) when I created a HVM. But 
the vbd statistics (e.g. rd_req, wr_req, wr_sect, rd_sect) are all 0. 
For PV guest or PV driver, I can get the vbd's statistics directly. So 
I'm wondering vbd is not really used by HVM. Could anyone kindly tell me 
which device is used for block device in dom0 for HVM? Thanks in advance.

Randy