Ovirt 4.1 USB Api problems

16 Mar 2017

      Hi,

I don't know if this is the correct place for this question (i hope it 
is  ;-) ).

We are trying to make "enable USB support" work with a machine created 
from python ovirtsdk4 api,

here is the code:

             cluster = ovirt.types.Cluster(id=six.binary_type(clusterId))
             template = ovirt.types.Template(id=six.binary_type(templateId))
             if usbType in ('native', 'legacy'):
                 usb = ovirt.types.Usb(enabled=True, 
type=ovirt.types.UsbType.NATIVE if usbType == 'native' else 
ovirt.types.UsbType.LEGACY)
             else:
                 usb = ovirt.types.Usb(enabled=False)

             memoryPolicy = 
ovirt.types.MemoryPolicy(guaranteed=guaranteedMB * 1024 * 1024)
             par = ovirt.types.Vm(name=name, cluster=cluster, 
template=template, description=comments,
type=ovirt.types.VmType.DESKTOP, memory=memoryMB * 1024 * 1024, 
memory_policy=memoryPolicy,
                             usb=usb)  # display=display,

             return api.system_service().vms_service().add(par).id

The cuestion is that the machines gets correctly created, but when we 
try to start the machine, we get an this error (extract from vdsm):

Traceback (most recent call last):
   File "/usr/share/vdsm/virt/vm.py", line 552, in _startUnderlyingVm
     self._run()
   File "/usr/share/vdsm/virt/vm.py", line 1994, in _run
     self._connection.createXML(domxml, flags),
   File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", 
line 123, in wrapper
     ret = f(*args, **kwargs)
   File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 941, in 
wrapper
     return func(inst, *args, **kwargs)
   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3784, in 
createXML
     if ret is None:raise libvirtError('virDomainCreateXML() failed', 
conn=self)
libvirtError: Error XML: Duplicate USB controllers with index 0

The question is, that if to this machine we have created, from 
administration interface, remove an add support for usb, the machine 
works, and the generated XML differs:

This is the difference we have found:

<         <controller index="0" model="piix3-uhci" type="usb">
<             <address bus="0x00" domain="0x0000" function="0x2" 
slot="0x01" type="pci" />
<         </controller>
40a38
...
<address bus="0x00" domain="0x0000" function="0x0"
slot="0x02" type="pci" />

The "<" are from the non working (created from API call), and the ">" 
are same machine after disabling and enabling again "usb support".

Is this a bug?, if not, ¿How is supposed to be enabled USB support from 
API on VM  Creation?,

By the way, the equivalent code for oVirt 3.x was working without 
problems, the problems arises from 4.0 onwards.

Sorry for the inconveniences, and thank in advance for any help,

Adolfo Gómez

Adolfo

Michal Skrivanek

Michal Skrivanek

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