[Bug 1561497] [NEW] XML error: No PCI buses available when defining MIPS VM

[Magnus]

Public bug reported:

When trying to define a VM using mips64el architecture, I get the
following error message from virsh:

XML error: No PCI buses available

Using virt-manager results in a similar error message.

XML file used:

<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
  <name>qemu-malta</name>
  <memory unit='KiB'>2097152</memory>
  <currentMemory unit='KiB'>2097152</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='mips64el' machine='malta'>hvm</type>
    <kernel>/tmp/qemu.elf</kernel>
    <boot dev='hd'/>
  </os>
  <cpu mode='custom' match='exact'>
    <model fallback='allow'>R4000</model>
  </cpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-mips64el</emulator>
    <interface type='bridge' trustGuestRxFilters='yes'>
      <source bridge='br0'/>
      <virtualport type='openvswitch'>
      </virtualport>
      <model type='virtio'/>
      <address type='virtio-mmio'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <memballoon model='none'/>
  </devices>
  <qemu:commandline>
    <qemu:arg value='-s'/>
  </qemu:commandline>
</domain>

Description:	Ubuntu Xenial Xerus (development branch)
Release:	16.04

libvirt-bin:
  Installed: 1.3.1-1ubuntu6
  Candidate: 1.3.1-1ubuntu6

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1561497

Title:
  XML error: No PCI buses available when defining MIPS VM

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