Get USB Touchscreen input on QEMU:
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Add this to the end of your QEMU command to have working USB touch as input. This is much better then the default PS/2 input since it syncs your host cursor with your guest:

-usb -device usb-ehci,id=ehci -device usb-host,bus=ehci.0,vendorid=1452 -device usb-tablet,bus=ehci.0

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Source: https://wiki.gentoo.org/wiki/QEMU/Windows_guest
Date: February 2024