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, 1 insertions, 1 deletions

diff --git a/tools/xenpaging/xenpaging.h b/tools/xenpaging/xenpaging.h
index e348db63c5..5a300c755c 100644
--- a/tools/xenpaging/xenpaging.h
+++ b/tools/xenpaging/xenpaging.h
@@ -36,7 +36,7 @@ struct mem_event {
     xc_evtchn *xce_handle;
     int port;
     mem_event_back_ring_t back_ring;
-    mem_event_shared_page_t *shared_page;
+    uint32_t evtchn_port;
     void *ring_page;
 };