kvm: Switch mouse to tablet mode

This allows to synchronise server position of the mouse with the client one,
thus making mouse really usable.

See https://wiki.gentoo.org/wiki/QEMU/Options#USB

software/kvm/buildout.hash.cfg

@@ -55,7 +55,7 @@ md5sum = b7e87479a289f472b634a046b44b5257
 
 [template-kvm-run]
 filename = template/template-kvm-run.in
-md5sum = a502782244d1be536b732ebb40725f47
+md5sum = f840e8b7af83982525f66d7ec12b7085
 
 [template-kvm-controller]
 filename = template/kvm-controller-run.in

software/kvm/template/template-kvm-run.in

@@ -277,6 +277,8 @@ kvm_argument_list = [qemu_path,
   '-pidfile', pid_file_path, '-msg', 'timestamp=on',
   '-D', logfile,
   '-nodefaults',
+  # switch to tablet mode for the mouse to have it synced with a client, see https://wiki.gentoo.org/wiki/QEMU/Options#USB
+  '-usbdevice', 'tablet',
 ]
 for disk_info in disk_info_list:
   kvm_argument_list += (