a question about L4_MAP_ITEM_GRANT

Chen Tian chen.tian at acm.org
Thu Sep 13 20:20:25 CEST 2012


I have a simple question. If a parent maps a page into a child's space with
this flag, can the parent regain this page and remove this mapping later? I
did a simple test. It seems that with this flag in l4_task_map, the child
owns the mapped page permanently. What I'd like to do is when a child
finishes its job and returns such a granted page to its parent, the parent
can reuse this page for some other child.

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