Description of problem:

Restoring a snapshot with RAM fails if the guest instance configured with usb disabled (the default) or usb legacy.

Version-Release number of selected component (if applicable):

Tested with F19 AIO install w/ oVirt 3.3RC, with guests running F19 and CentOS 6.4.

How reproducible:


Steps to Reproduce:
1. Create a VM in oVirt (usb will be set to disabled by default)
2. Start VM and take live snapshot, with "Save Memory" checked
3. Turn off VM, preview snapshot, start VM

Actual results:

VM won't start.

Expected results:

VM starts, restores state from snapshot.

Additional info:

I can run those steps 1-3 above, after switching to "native" usb, and it works as expected. "legacy" usb gives same results as disabled usb.

This appears to be the relevant log chunk from vdsm.log:

Thread-101353::ERROR::2013-08-26 15:28:58,806::vm::2062::vm.Vm::(_startUnderlyingVm) vmId=`da8cfa29-f8b8-4876-a1ae-13db996635b2`::The vm start process failed
Traceback (most recent call last):
  File "/usr/share/vdsm/vm.py", line 2022, in _startUnderlyingVm
    self._run()
  File "/usr/share/vdsm/vm.py", line 2890, in _run
    self._connection.restoreFlags(fname, srcDomXML, 0)
  File "/usr/lib64/python2.7/site-packages/vdsm/libvirtconnection.py", line 76, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3346, in restoreFlags
    if ret == -1: raise libvirtError ('virDomainRestoreFlags() failed', conn=self)
libvirtError: unsupported configuration: Target controller type ide does not match source usb
Thread-101353::DEBUG::2013-08-26 15:28:58,812::vm::2448::vm.Vm::(setDownStatus) vmId=`da8cfa29-f8b8-4876-a1ae-13db996635b2`::Changed state to Down: unsupported configuration: Target controller type ide does not match source usb