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[Xen-devel] [PATCH 0/2] Add reference counting to grant notify ioctls

The current notify ioctls assume that an event channel will not be
closed prior to the page being unmapped. If the mappings are associated
with an open file descriptor and the application crashes, the
notification behavior depends on the close ordering of the file
descriptors. To avoid this, event channels now have a reference count
that is used by the grant notify ioctls to postpone the close operation
until the notification is fired.

[PATCH 1/2] xen/event: Add reference counting to event channel
[PATCH 2/2] xen/gnt{dev,alloc}: reserve event channels for notify

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