FM / parameters

/sys/module/xen_blkfront/parameters

Name	Size	Mode	Actions
feature_persistent	4096	0644	edit dl rm
max_indirect_segments	4096	0444	edit dl rm
max_queues	4096	0444	edit dl rm
max_ring_page_order	4096	0444	edit dl rm
trusted	4096	0644	edit dl rm

Edit: /sys/module/xen_blkfront/parameters/feature_persistent (4096B)