[Xen-users] Driver/Backend Domains

[Matthew Mallozzi <matt.mallozzi@xxxxxxxxxx>]

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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