Description of problem:
xen-guestinstall and virt-manager don't work with latest rawhide kernel
2.6.18-1.2798.fc6xen, but work on the same machine when I boot into the older
2.6.18-1.2747.fc6xen kernel.

Version-Release number of selected component (if applicable):
virt-manager-0.2.3-2.fc6
xen-3.0.2-44
2.6.18-1.2798.fc6xen

How reproducible:
always 

Steps to reproduce:
1. start with 2.6.18-1.2798.fc6xen
2. run xen-guestinstall:
# xenguest-install 
Would you like a fully virtualized guest (yes or no)?  This will allow you to
run unmodified operating systems. yes

Traceback (most recent call last):
  File "/usr/sbin/xenguest-install", line 396, in ?
    main()
  File "/usr/sbin/xenguest-install", line 327, in main
    guest = virtinst.FullVirtGuest()
  File "/usr/lib/python2.4/site-packages/virtinst/FullVirtGuest.py", line 30, in
__init__
    XenGuest.XenGuest.__init__(self, hypervisorURI=hypervisorURI)
  File "/usr/lib/python2.4/site-packages/virtinst/XenGuest.py", line 174, in
__init__
    self.conn = libvirt.open(hypervisorURI)
  File "/usr/lib64/python2.4/site-packages/libvirt.py", line 39, in open
    if ret is None:raise libvirtError('virConnectOpen() failed')
libvirt.libvirtError: virConnectOpen() failed

Same error happens when I type "no". virt-manager ask for the host to connect to
and that end without further error-messages.