This change got uploaded into ubuntu on 2017-03-28, before this bug report was filed, but due to various regressions was not published until 2017-04-08.
With most current Ubuntu 17.04, and 232-21ubuntu2 stable interface names are used for virtio_net defices based on the bus IDs just like on LPAR and z/VM. Specifically interfaces names are renamed into: enc2 and enc3 for my xml of the guest, which corresponds to the devno in the xml definition: <interface type='network'> <mac address='52:54:00:d7:31:0f'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='virtio'/> <alias name='net0'/> <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0002'/> </interface> <interface type='network'> <mac address='52:54:00:0a:4e:5f'/> <source network='default' bridge='virbr0'/> <target dev='vnet1'/> <model type='virtio'/> <alias name='net1'/> <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0003'/> </interface> I am marking this bug as fix released. ** Changed in: systemd (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1679674 Title: s390x: Interface order in kvm guest image not predictable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1679674/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs