libvirt/tests/qemuxmlconfdata/usb-controller-ich9-autoassign.xml

<domain type='qemu'>
  <name>QEMUGuest1</name>
  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
  <memory unit='KiB'>219136</memory>
  <currentMemory unit='KiB'>219136</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc'>hvm</type>
    <boot dev='hd'/>
  </os>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0' bus='0' slot='4' function='7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <master startport='0'/>
      <address type='pci' domain='0' bus='0' slot='4' function='0' multifunction='on'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <master startport='2'/>
      <address type='pci' domain='0' bus='0' slot='4' function='1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0' bus='0' slot='4' function='2'/>
    </controller>
    <hub type='usb'/>
    <input type='mouse' bus='usb'>
    </input>
    <hub type='usb'>
    </hub>
    <input type='mouse' bus='usb'>
    </input>
    <input type='mouse' bus='usb'>
    </input>
    <memballoon model='virtio'/>
  </devices>
</domain>