FM / xenbus

/sys/devices/vif-0/xenbus

Name	Size	Mode	Actions
events	4096	0444	edit dl rm
event_channels	4096	0444	edit dl rm
jiffies_eoi_delayed	4096	0444	edit dl rm
spurious_events	4096	0444	edit dl rm
spurious_threshold	4096	0644	edit dl rm

Edit: /sys/devices/vif-0/xenbus/event_channels (4096B)