How do you configure tablet for mouse in xen guest os

I’ve got a couple of VM’s running successfully under xen on 11.1. however the mouse acceleration that leads to it getting out of synch is quite frustrating. I attempted to follow the directions in the Xen documentation on how to setup a tablet as a pointer device but I lose the mouse - it just locks up

Can anyone who has managed this on 11.1 provide a succinct step by step on how to do it.