libvirt/tests/xencapsdata/xen-x86_64.xml

<capabilities>
  <host>
    <cpu>
      <arch>x86_64</arch>
      <features>
        <svm/>
      </features>
    </cpu>
    <migration_features>
      <live/>
      <uri_transports>
        <uri_transport>xenmigr</uri_transport>
      </uri_transports>
    </migration_features>
  </host>

  <guest>
    <os_type>xen</os_type>
    <arch name="x86_64">
      <wordsize>64</wordsize>
      <domain type="xen"></domain>
    </arch>
    <features>
    </features>
  </guest>
</capabilities>