[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [PATCH v4 0/3] Add reference counting to grant notify ioctls
On Thu, Oct 27, 2011 at 05:58:46PM -0400, Daniel De Graaf wrote: > > 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. OK, it all looks sensible to me. Sticking on my 3.3 queue. Thx! > > Changes since v3: > Avoid race between evtchn_get and evtchn_put > (reference count changed to an integer protected by mutex) > > 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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