In order to allow control commands with binary data refactor handling
of XS_CONTROL:
- get primary command first
- add maximum number of additional parameters to pass to command
handler
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Wei Liu <wl@xen.org>