Juergen Gross 4d3fe31bd9 xen/events: add a proper barrier to 2-level uevent unmasking ... A follow-up patch will require certain write to happen before an event channel is unmasked. While the memory barrier is not strictly necessary for all the callers, the main one will need it. In order to avoid an extra memory barrier when using fifo event channels, mandate evtchn_unmask() to provide write ordering. The 2-level event handling unmask operation is missing an appropriate barrier, so add it. Fifo event channels are fine in this regard due to using sync_cmpxchg(). This is part of XSA-332. Cc: stable@vger.kernel.org Suggested-by: Julien Grall <julien@xen.org> Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Julien Grall <jgrall@amazon.com> Reviewed-by: Wei Liu <wl@xen.org>		2020-10-20 10:21:56 +02:00
..
events_2l.c	xen/events: add a proper barrier to 2-level uevent unmasking	2020-10-20 10:21:56 +02:00
events_base.c	xen/events: avoid removing an event channel while handling it	2020-10-20 10:21:51 +02:00
events_fifo.c	xen: Use evtchn_type_t as a type for event channels	2020-04-07 12:12:54 +02:00
events_internal.h	xen: Use evtchn_type_t as a type for event channels	2020-04-07 12:12:54 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00