         <vendor id="0x04b3"/>
         <product id="0x4485"/>
       </source>
+      <driver name="vfio"/>
     </hostdev>
     <hostdev mode="subsystem" type="usb" managed="yes">
       <source>
         <address bus="3" device="2"/>
       </source>
+      <driver name="vfio"/>
     </hostdev>
     <hostdev mode="subsystem" type="pci" managed="yes">
       <source>
         <address domain="0x0000" bus="0x00" slot="0x19" function="0x0"/>
       </source>
+      <driver name="vfio"/>
     </hostdev>
     <hostdev mode="subsystem" type="pci" managed="yes">
       <source>
         <address domain="0x0003" bus="0x00" slot="0x19" function="0x0"/>
       </source>
+      <driver name="vfio"/>
     </hostdev>
     <redirdev bus="usb" type="tcp">
       <source mode="connect" host="localhost" service="4000"/>

Domain 'test-many-devices' defined successfully.
Changes will take effect after the next domain shutdown.