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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Jul 2025 23:59:29.9610 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1a4832a1-777c-4f72-8c04-08ddcbd74b76 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF0000020A.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4257 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1753487991916116600 Content-Type: text/plain; charset="utf-8" Include the event channel in struct xenstore_domain_interface. This way the toolstack or xen can communicate the event channel to xenstored in memory xenstored already needs to access. xenstored maps the grant with the well known GNTTAB_RESERVED_XENSTORE index, so no further information is needed. Suggested-by: Juergen Gross Signed-off-by: Jason Andryuk Reviewed-by: Juergen Gross --- v2: s/domU/domain/ in comment Add Juergen's R-b --- xen/include/public/io/xs_wire.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/xen/include/public/io/xs_wire.h b/xen/include/public/io/xs_wir= e.h index e92a87a07b..d2e2b8b9eb 100644 --- a/xen/include/public/io/xs_wire.h +++ b/xen/include/public/io/xs_wire.h @@ -110,6 +110,7 @@ struct xenstore_domain_interface { uint32_t server_features; /* Bitmap of features supported by the serve= r */ uint32_t connection; uint32_t error; + uint32_t evtchn_port; }; =20 /* Violating this is very bad. See docs/misc/xenstore.txt. */ @@ -134,6 +135,12 @@ struct xenstore_domain_interface { #define XENSTORE_ERROR_RINGIDX 2 /* Invalid ring index */ #define XENSTORE_ERROR_PROTO 3 /* Protocol violation (payload too long) = */ =20 +/* + * The evtchn_port field is the domain's event channel for xenstored to si= gnal. + * It is filled in by Xen for dom0less/Hyperlaunch domains. It is only us= ed + * when non-zero. Otherwise the event channel from XS_INTRODUCE is used. + */ + #endif /* _XS_WIRE_H */ =20 /* --=20 2.50.1