I used to use QEMU/KVM with -usbdevice tablet, which might be the same thing.
If so then we have some significant open bugs in that area already:
https://bugs.launchpad.net/mir/+bugs?field.tag=wacom
** Tags added: vm
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** Also affects: mir
Importance: Undecided
Status: New
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1636901
