[xen staging] xen: Add static event channel in SUPPORT.md on ARM

[patchbot@xxxxxxx]

commit efc220bcbd282dc01db05aa673bd9ed2b42f6632
Author:     Rahul Singh <rahul.singh@xxxxxxx>
AuthorDate: Fri Sep 23 12:02:17 2022 +0100
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Oct 3 17:54:36 2022 -0700

    xen: Add static event channel in SUPPORT.md on ARM
    
    Static event channel support is tech preview, which shall be documented
    in SUPPORT.md
    
    Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
    Reviewed-by: Ayan Kumar Halder <ayankuma@xxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
 SUPPORT.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index 8ebd63ad82..29f74ac506 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -922,6 +922,13 @@ bootscrub=off are passed as Xen command line parameters. 
(Memory should
 be scrubbed with bootscrub=idle.) No XSAs will be issues due to
 unscrubbed memory.
 
+## Static Event Channel
+
+Allow to setup the static event channel on dom0less system, enabling domains
+to send/receive notifications.
+
+    Status, ARM: Tech Preview
+
 # Format and definitions
 
 This file contains prose, and machine-readable fragments.
--
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