Note: XL Setup requires launching multiple instances of QEMU to spawn the different components of the system (Modular bed, extruder(s) etc). See the launch-xl.sh script in hw/arm/prusa as a starting point for your own configuration.
Note: To create "additional" tool heads, increment the final "-0" in the machine name. For example, "-machine prusa-xl-extruder-060-1". Valid values are 0-4. They must be spawned before the main instance is unpaused, see launch-xl.sh for examples.