libvirt: USB bus is disabled

[kiki]

when i want use spice in nova, the log show error: unsupported configuration: Can't add USB input device. USB bus is disabled

2021-10-09 03:41:08.115+0000: 2673391: error : virNetDevGetLinkInfo:2480 : unable to read: /sys/class/net/qvodf13657b-48/operstate: No such file or directory
2021-10-09 06:43:49.368+0000: 2673391: error : virDomainDefParseXML:21117 : unsupported configuration: Can't add USB input device. USB bus is disabled
2021-10-09 06:50:29.365+0000: 2673392: error : virDomainInputDefParseXML:13388 : internal error: ps2 bus does not support tablet input device

i can not add one usd device

such as:
<devices>
   <input type='tablet' bus='usb'/>
</devices>

[kiki (kikibuchitang)]

198c875975fa quay.io/openstack.kolla/ubuntu-source-nova-libvirt:wallaby

docker exec -it 198c875975fa bash

in nova-libvirt, i suggest rebuild ubuntu-source-nova-libvirt with --enable-libusb and --enable-usb-redir.

qemu Can''t add USB input device. USB bus is disabled
Found a solution: Had to compile qemu with --enable-libusb and --enable-usb-redir