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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jul 2025 00:21:42.4900 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1e28da7b-8f04-4eb9-6f9f-08ddc8b5bc0f 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000026C8.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7288 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1753143732257116600 Content-Type: text/plain; charset="utf-8" Expose a domain's capabilities - control, hardware or xenstore - through stable get domain state hypercall. The xenstore domain can use this information to assign appropriate permissions on connections. Repurpose the 16bit pad field for this purpose. Signed-off-by: Jason Andryuk Reviewed-by: Juergen Gross Reviewed-by: Stefano Stabellini --- v2: Init info->caps =3D 0 Remove stale comment on caps field Add Juergen's R-b --- xen/common/domain.c | 10 +++++++++- xen/include/public/domctl.h | 7 +++++-- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/xen/common/domain.c b/xen/common/domain.c index c347de4335..bb33b1f1c7 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -195,6 +195,14 @@ static void set_domain_state_info(struct xen_domctl_ge= t_domain_state *info, info->state |=3D XEN_DOMCTL_GETDOMSTATE_STATE_DYING; if ( d->is_dying =3D=3D DOMDYING_dead ) info->state |=3D XEN_DOMCTL_GETDOMSTATE_STATE_DEAD; + + info->caps =3D 0; + if ( is_control_domain(d) ) + info->caps |=3D XEN_DOMCTL_GETDOMSTATE_CAP_CONTROL; + if ( is_hardware_domain(d) ) + info->caps |=3D XEN_DOMCTL_GETDOMSTATE_CAP_HARDWARE; + if ( is_xenstore_domain(d) ) + info->caps |=3D XEN_DOMCTL_GETDOMSTATE_CAP_XENSTORE; info->unique_id =3D d->unique_id; } =20 @@ -205,7 +213,7 @@ int get_domain_state(struct xen_domctl_get_domain_state= *info, struct domain *d, int rc =3D -ENOENT; struct domain *hdl; =20 - if ( info->pad0 || info->pad1 ) + if ( info->pad0 ) return -EINVAL; =20 if ( d ) diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h index f1f6f96bc2..136820ea5b 100644 --- a/xen/include/public/domctl.h +++ b/xen/include/public/domctl.h @@ -1269,8 +1269,11 @@ struct xen_domctl_get_domain_state { #define XEN_DOMCTL_GETDOMSTATE_STATE_SHUTDOWN 0x0002 /* Shutdown finishe= d. */ #define XEN_DOMCTL_GETDOMSTATE_STATE_DYING 0x0004 /* Domain dying. */ #define XEN_DOMCTL_GETDOMSTATE_STATE_DEAD 0x0008 /* Domain dead. */ - uint16_t pad0; /* Must be 0 on input, returned as 0. */ - uint32_t pad1; /* Must be 0 on input, returned as 0. */ + uint16_t caps; +#define XEN_DOMCTL_GETDOMSTATE_CAP_CONTROL 0x0001 /* Control domain. = */ +#define XEN_DOMCTL_GETDOMSTATE_CAP_HARDWARE 0x0002 /* Hardware domain.= */ +#define XEN_DOMCTL_GETDOMSTATE_CAP_XENSTORE 0x0004 /* Xenstore domain.= */ + uint32_t pad0; /* Must be 0 on input, returned as 0. */ uint64_t unique_id; /* Unique domain identifier. */ }; =20 --=20 2.50.1