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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2025 20:44:51.8897 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 054fefcc-122c-473c-6933-08dd8cded9b0 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: BN3PEPF0000B076.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6036 Content-Type: text/plain; charset="utf-8" Make xenbus_init() allow a non-local xenstore for a PVH dom0 - it is currently forced to XS_LOCAL. With Hyperlaunch booting dom0 and a xenstore stubdom, dom0 can be handled as a regular XS_HVM following the late init path. Ideally we'd drop the use of xen_initial_domain() and just check for the event channel instead. However, ARM has a xen,enhanced no-xenstore mode, where the event channel and PFN would both be 0. Retain the xen_initial_domain() check, and use that for an additional check when the event channel is 0. Check the full 64bit HVM_PARAM_STORE_EVTCHN value to catch the off chance that high bits are set for the 32bit event channel. Signed-off-by: Jason Andryuk Change-Id: I5506da42e4c6b8e85079fefb2f193c8de17c7437 Reviewed-by: Stefano Stabellini --- v2: Re-add xen_initial_domain() check to avoid breaking ARM's xen,enhanced no-xenstore mode where event channel and PFN are both 0. drivers/xen/xenbus/xenbus_probe.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_= probe.c index 22d3f90ee205..b12cbd9663e3 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -969,9 +969,15 @@ static int __init xenbus_init(void) if (xen_pv_domain()) xen_store_domain_type =3D XS_PV; if (xen_hvm_domain()) + { xen_store_domain_type =3D XS_HVM; - if (xen_hvm_domain() && xen_initial_domain()) - xen_store_domain_type =3D XS_LOCAL; + err =3D hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); + if (err) + goto out_error; + xen_store_evtchn =3D (int)v; + if (!v && xen_initial_domain()) + xen_store_domain_type =3D XS_LOCAL; + } if (xen_pv_domain() && !xen_start_info->store_evtchn) xen_store_domain_type =3D XS_LOCAL; if (xen_pv_domain() && xen_start_info->store_evtchn) @@ -990,10 +996,6 @@ static int __init xenbus_init(void) xen_store_interface =3D gfn_to_virt(xen_store_gfn); break; case XS_HVM: - err =3D hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); - if (err) - goto out_error; - xen_store_evtchn =3D (int)v; err =3D hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); if (err) goto out_error; --=20 2.34.1