[CentOS-virt] Using the parallel port from domU

Manuel Wolfshant wolfy at nobugconsulting.ro
Mon Feb 2 14:03:35 UTC 2009


    I use xen and I am trying to use the parallel port of Centos 5.2 
host from a Windows XP (HVM) guest. I have tried to transfer control of 
the port by blacklisting lp, parport and parport_pc + adding:
    ioports = [ "0378-037a" ]
to the xen configuration file.

    However, in the presence of this line, xm create replies with:

Error: function takes exactly 4 arguments (3 given)

    In xend.log I see:
[2009-02-02 15:36:34 xend.XendDomainInfo 6246] DEBUG 
(XendDomainInfo:1603) XendDomainInfo.destroy: domid=13
[2009-02-02 15:36:34 xend 6246] ERROR (xmlrpclib2:184) function takes 
exactly 4 arguments (3 given)
Traceback (most recent call last):
  File "/usr/lib64/python2.4/site-packages/xen/util/xmlrpclib2.py", line 
162, in _marshaled_dispatch
    response = self._dispatch(method, params)
  File "/usr/lib64/python2.4/SimpleXMLRPCServer.py", line 406, in _dispatch
    return func(*params)
line 64, in domain_create
    info = XendDomain.instance().domain_create(config)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py", line 
238, in domain_create
    dominfo = XendDomainInfo.create(config)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", 
line 205, in create
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", 
line 1507, in initDomain
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", 
line 1716, in createDevices
    self.createDevice(n, c)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", 
line 1189, in createDevice
    return self.getDeviceController(deviceClass).createDevice(devconfig)
line 80, in createDevice
    (devid, back, front) = self.getDeviceDetails(config)
  File "/usr/lib64/python2.4/site-packages/xen/xend/server/iopif.py", 
line 78, in getDeviceDetails
    allow_access = True)
TypeError: function takes exactly 4 arguments (3 given)

    Except of a bug from 2007 and which should be fixed for a long time 
(and which is only PARTIALLY included in xen as available in 5.2), I 
have not found anything. I did apply the unapplied part of 
http://bugs.centos.org/file_download.php?file_id=474&type=bug but there 
is no change.

    Any ideas ?


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