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xen-devel
[Xen-devel] [PATCH v3 0/3] 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.
Changes since v2:
Avoid possible sleep under spinlock
Decrease refcount mismatch errors from BUG to WARN
Use reference count to identify userspace-visible event channels
Changes since v1:
Rename evtchn_get/put to match kernel naming conventions
Use atomic_t for refcount
[PATCH 1/3] xen/event: Add reference counting to event channels
[PATCH 2/3] xen/gntalloc: Change gref_lock to a mutex
[PATCH 3/3] xen/gnt{dev,alloc}: reserve event channels for notify
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