I'm trying to emulate an old machine and have working xserver with absolute input, I've managed to add wacom driver to the guest (and I suppose that's the best I can do). The wacom driver does not support the default tablet device provided by qemu/kvm via virt-manager.
As far as I found qemu/kvm does support usb-wacom-tablet.
How to add it in virt-manager? What would be the corresponding xml?