Ok, could you maybe try something like this instead:
qemu-system-x86_64 ... -usb \ -device qemu-xhci,id=xhci \ -device usb-tablet,bus=usb-bus.0 \ -device usb-kbd,bus=usb-bus.0 \ -device usb-host,bus=xhci.0,vendorid=0x05ac,productid=0x12a8
i.e. use "bus=xhci.0" for the usb-host device?
Ok, could you maybe try something like this instead:
qemu-system-x86_64 ... -usb \ bus=usb- bus.0 \ bus=usb- bus.0 \ bus=xhci. 0,vendorid= 0x05ac, productid= 0x12a8
-device qemu-xhci,id=xhci \
-device usb-tablet,
-device usb-kbd,
-device usb-host,
i.e. use "bus=xhci.0" for the usb-host device?