+ * Design note: We create one PIO/MMIO device (iosignalfd_group) whichSome duplicate spaces in the text above, apparently at random places.
+ * aggregates one or more iosignalfd_items. Each item points to exactly one
+ * eventfd, and can be registered to trigger on any write to the group
+ * (wildcard), or to a write of a specific value. If more than one item is to
+ * be supported, the addr/len ranges must all be identical in the group. If a
+ * trigger value is to be supported on a particular item, the group range must
+ * be exactly the width of the trigger.
Can you elaborate?