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[Xen-users] Driver/Backend Domains

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Driver/Backend Domains
From: Matthew Mallozzi <matt.mallozzi@xxxxxxxxxx>
Date: Thu, 02 Jul 2009 16:00:07 -0700
Delivery-date: Mon, 06 Jul 2009 07:49:58 -0700
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What is required for a PV domU to act as a driver domain for a block device? My goal is to attach a disk image file located within the domU to dom0 as a block device. The command I am running in dom0 is
   xm block-attach 0 file:/root/hdisk.img /dev/xvdb w 2,
where hdisk.img is the disk image file in domU, xvdb is the name of the intended device node in dom0, and 2 is the domain ID of the domU.

My domU is a PV guest with its kernel replaced by the kernel from dom0, and I have copied over both /etc/xen/scripts and /usr/lib/python2.4/site-packages/xen from dom0 to the guest. However, whenever I attempt the above command, it sits for a while and then returns with "Error: Device 51744 (vbd) could not be connected. Hotplug scripts not working.", which is quite vague.

Thank you!

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