Tools: Remove shared page from mem_event/access/paging interfaces

Don't use the superfluous shared page, return the event channel directly as
part of the domctl struct, instead.

In-tree consumers (xenpaging, xen-access) updated. This is an ABI/API change,
so please voice any concerns.

Known pending issues:
- pager could die and its ring page could be used by some other process, yet
  Xen retains the mapping to it.
- use a saner interface for the paging_load buffer.

This change also affects the x86/mm bits in the hypervisor that process the
mem_event setup domctl.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Acked-by: Tim Deegan <tim@xen.org>
Acked-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Tim Deegan <tim@xen.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 3699929096..8c5931368d 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -190,8 +190,6 @@ struct mem_event_domain
     /* The ring has 64 entries */
     unsigned char foreign_producers;
     unsigned char target_producers;
-    /* shared page */
-    mem_event_shared_page_t *shared_page;
     /* shared ring page */
     void *ring_page;
     /* front-end ring */