Comment 20 for bug 1719196

The problem is with virtio-mmio.

https://bugzilla.redhat.com/show_bug.cgi?id=1422413

Instances launched with virtio-mmio on aarch64 will not get DHCP (will not have a nic)

xml with libvirt 2.5.0

    <interface type='bridge'>
      <mac address='fa:16:3e:af:95:2e'/>
      <source bridge='qbrb5abdeb0-a0'/>
      <target dev='tapb5abdeb0-a0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='virtio-mmio'/>

I have updated libvirt-daemon to 3.6.0 on a particular compute node - when an instance is booted now, the nic section of the virsh xml looks like this:

    <interface type='bridge'>
      <mac address='fa:16:3e:10:0e:22'/>
      <source bridge='qbr274809a0-dc'/>
      <target dev='tap274809a0-dc'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>

The instance then gets a NIC and is able to get DHCP and complete cloud-init successfully.