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[Xen-devel] Error: Device 768 (vbd) could not be connected. Backend device not found.


I am getting this error when I try to start an HVM guest on an AMD Sahara system. The xen-unstable-hvm.hg revision 8724 works fine. I tried to upgrade to xen-unstable.hg revision 9668. I got 9668 to boot using 'yaird' to build the initrd for the -xen kernel. I can successfully start a paravirtualized guest, but I am now having trouble starting an HVM guest. The error message is:

Error: Device 768 (vbd) could not be connected. Backend device not found.

I googled a bit and other people have seen this error, but no solutions
seem to be presented.

Each attempt to start the domain puts a line like the following in
/var/log/xen-hotplug.log (The '8' here is the domain ID):

xenstore-read: couldn't read path backend/vbd/8/768/node

Here is my config file:

kernel = "/usr/lib/xen/boot/hvmloader"
memory = 260
name = "Sarge"
disk = [ 'file:/sarge/disk.img,ioemu:hda,w' ]
vif = [ 'type=ioemu, mac=00:14:bf:52:df:5e, bridge=xenbr0' ]
device_model = '/usr/lib/xen/bin/qemu-dm'
memmap = '/usr/lib/xen/boot/mem-map.sxp'

I have made sure that xend and xenstored are running, but I'm not sure what else to check (it works on the older Xen!). Any suggestions would be greatly appreciated.


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