When rummaging through sysfs, I noticed this:
(initramfs) ls -l /sys/bus/xen/devices/vbd-2065/
-r--r--r--    1 0        0            4096 Feb 12 17:31 devtype
-r--r--r--    1 0        0            4096 Feb 12 17:31 nodename
drwxr-xr-x    2 0        0               0 Feb 12 17:31 power
lrwxrwxrwx    1 0        0               0 Feb 12 17:31 subsystem -> 
../../../bus/xen
-rw-r--r--    1 0        0            4096 Feb 11 07:53 uevent


while a normal domU has this:
suzy2:~# ls -l /sys/bus/xen/devices/vbd-2053/
total 0
lrwxrwxrwx 1 root root    0 Feb 12 18:33 block:sda5 -> ../../../block/sda5
lrwxrwxrwx 1 root root    0 Feb 12 18:33 bus -> ../../../bus/xen
-r--r--r-- 1 root root 4096 Feb 12 18:33 devtype
lrwxrwxrwx 1 root root    0 Feb 12 18:33 driver -> ../../../bus/xen/drivers/vbd
-r--r--r-- 1 root root 4096 Feb 12 18:33 nodename
drwxr-xr-x 2 root root    0 Jan  8 21:34 power
lrwxrwxrwx 1 root root    0 Feb 12 18:33 subsystem -> ../../../bus/xen
--w------- 1 root root 4096 Feb 12 18:33 uevent

So the driver and block:xxx links are missing.

I noticed that CONFIG_SYSFS_DEPRECATED is not set in the config.
Might that have anything to do with this?

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2.6.24-7 does not start as xen domU
https://bugs.launchpad.net/bugs/190870
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