Version-Release number of selected component (if applicable):
xen-3.1.0-5.fc8


Description of problem:
'xm start' is raising this exception on xend, here:
[2007-09-05 18:29:17 3692] ERROR (xmlrpclib2:178) Internal error handling 
xend.domain.start
Traceback (most recent call last):
  File "/usr/lib64/python2.5/site-packages/xen/util/xmlrpclib2.py", line 131, 
in _marshaled_dispatch
    response = self._dispatch(method, params)
  File "/usr/lib64/python2.5/SimpleXMLRPCServer.py", line 415, in _dispatch
    return func(*params)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomain.py", line 994, 
in domain_start
    dominfo.start(is_managed = True)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", line 
398, in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendTask.py", line 209, in 
log_progress
    retval = func(*args, **kwds)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", line 
1580, in _initDomain
    self._createDevices()
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", line 
1369, in _createDevices
    devid = self._createDevice(devclass, config)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", line 
1345, in _createDevice
    return self.getDeviceController(deviceClass).createDevice(devConfig)
  File "/usr/lib64/python2.5/site-packages/xen/xend/server/vfbif.py", line 78, 
in createDevice
    args += ['-vnc', "%s:%d%s" % (vnclisten, vncdisplay, vncopts)]
TypeError: int argument required

A cast to int on config.get('vncdisplay') was removed by 
xen-pvfb-02-qemu-pv-machine.patch.

The attached patch fixes the problem.