I am trying to pass through a USB Dongle to a Windows virtual machine in ovirt 4.3.6. This will work if these options aren't used. Below is the output of lsusb with no iommu enable: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 1604:10c0 Tascam Bus 001 Device 004: ID 1604:10c0 Tascam Bus 001 Device 003: ID 1604:10c0 Tascam Bus 001 Device 002: ID 07f2:0001 Microcomputer Applications, Inc. KEYLOK II Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub The device I am passing through is Bus 001 Device 002. This is the error I get in vdsmd.log: Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 867, in _startUnderlyingVm self._run() File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2890, in _run self._domDependentInit() File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2466, in _domDependentInit self._vmDependentInit() File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2480, in _vmDependentInit self._getUnderlyingVmDevicesInfo() File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2448, in _getUnderlyingVmDevicesInfo vmdevices.common.update_device_info(self, self._devices) File "/usr/lib/python2.7/site-packages/vdsm/virt/vmdevices/common.py", line 94, in update_device_info hostdevice.HostDevice.update_device_info(vm, devices[hwclass.HOSTDEV]) File "/usr/lib/python2.7/site-packages/vdsm/virt/vmdevices/hostdevice.py", line 426, in update_device_info vm, device_conf, device_xml) File "/usr/lib/python2.7/site-packages/vdsm/virt/vmdevices/hostdevice.py", line 223, in update_from_xml if host_address == dev.hostAddress: AttributeError: 'MdevDevice' object has no attribute 'hostAddress' 2019-11-18 18:20:06,173-0600 INFO (vm/9944089c) [virt.vm] (vmId='9944089c-2109-4352-a0c6-7d0d9e04bb3f') Changed state to Down: 'MdevDevice' object has no attribute 'hostAddress' (code=1) (vm:1690) I am using kernel 3.10.0-957.12.1.el7.x86_64 vdsm is vdsm-4.30.33-1.el7.x86_64 libvirt is libvirt-5.0.0-1.el7.x86_64 qemu is qemu-img-ev-2.12.0-33.1.el7.x86_64 Any help with this issue would be appreciated. Thanks Don