pseries-many-buses-1.xml

<domain type='qemu'>
  <name>guest</name>
  <uuid>1ccfd97d-5eb4-478a-bbe6-88d254c16db7</uuid>
  <memory unit='KiB'>524288</memory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='ppc64' machine='pseries'>hvm</type>
  </os>
  <devices>
    <emulator>/usr/bin/qemu-system-ppc64</emulator>
    <!-- The SCSI controller is plugged into PCI bus 1, but since said bus
         is not present in the configuration libvirt will have to add it -->
    <controller type='scsi' model='virtio-scsi'>
      <address type='pci' bus='1' slot='1'/>
    </controller>
    <controller type='usb' model='none'/>
    <memballoon model='none'/>
  </devices>
</domain>