Change default USB controller type

Hi

We are running our VM’s using the KVM driver, just wondering what the easiest way is to set the default usb controller from model piix3-uhci to controller type=‘usb’ index=‘0’ model=‘nec-xhci’ ? So each VM is brought up with a USB 3 controller?

Edit: Think I’ve solved it, needed to add

 <controller type='usb' index='0' model='nec-xhci'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </controller>
</devices>

to the RAW section in templates