qemu-kvm -smp 4 -m 2048 -hda /images/Win7.img -usb -usbdevice tablet
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<input type='mouse' bus='ps2'/>
/usr/bin/qemu-kvm -name win2016 -kvmdev /dev/kvm0 -S -machine pc-i440fx-2.1,accel=kvm,usb=off ... -device usb-tablet,id=input0 ...