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bh=WfLPMpH8LtRG8qnXzF/foDvebuOFDGtRC45knZK6XFQ=; b=wpTWSvm04I6h+9XZOgCKJncsDf97pOv89q0ubTlGdYcpUV6BwuOlHn+kZYPlhGUIZ/V2dYf00FGOXYcukynEjH5+0dTdZDVAlJdlMIIMqK8gbDr67QTbAMbRJkvxmSkE0EK5fLnJpA5CDLUXDVirop5v4FAjqDtyry3FsUxaEzE= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb08.amd.com; pr=C Message-ID: <170401c0-0d3b-4481-ad3b-e3f149a4843e@amd.com> Date: Fri, 21 Aug 2026 16:42:29 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] Linux kernel crash in amd_smn_init during PVH Dom0 boot on AMD EPYC To: Arthur Borsboom , Jan Beulich CC: References: <4a1b5392-93b9-4b9e-bf65-3fb280f385fa@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: bqgxChAk7XlRnS2n+Dbcn9SKEIqmFasSal2UtWf5Nfzs/zAlXz119h3kPMMJEmx2VqGGO5p5Ar5dJu/X5PksbwA6attqZHMb73WTV8HbQAwPVUMNYTL82saCRnc/I5OmjUjLBFH6UBRDwl9CHuUKoRGZsfO1By/utd+oN07rmxyVnnoziKvg5EZWjrtRD9xlSxYgnfnAWHIttOvPsmDGLNv3Bo0pU0sB+4sPG+iA6blqm/QuOGPSUJtcrXkTOWVMXGo6mDc+v11peMoM3lrWOZR+qASUpkyMKrB0QZMcy5udpURISP4oUtPRZhBkjCyPRAJVaLnW319SsnyoV5POoa4O3lf0rjOpY00imfSlSiqCUsS029GkfBIETovC+LVW7akEvYz091OZeOOqh6X6wGvfemQz67Fj7LkB87PTgHTApVFE0Mh0LSATlwWgDfkL X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Aug 2026 20:42:30.9629 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 64840380-124a-4bc9-e50a-08deffc4b8f6 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=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000252A1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5742 X-purgate-ID: tlsNG-ebf023/1787344962-C22D4B50-2ECBCDF4/0/0 X-purgate-type: clean X-purgate-size: 1551 On 2026-08-19 03:09, Arthur Borsboom wrote: > It has taken me about 1,5 day of work to find out why the screen > remained black, to determine where the problem was, how to retrieve > potential info by a serial-over-LAN console, subscribe to the mailing > list, and create this bug report to help. Yes, this is annoying :/ > On Wed, 19 Aug 2026 at 08:50, Jan Beulich wrote: >> >> On 18.08.2026 23:47, Arthur Borsboom wrote: >>> Hi, >>> >>> I am encountering an early Linux kernel crash when booting a PVH >>> Dom0 on an AMD EPYC system (Family 19h Model 97). PV boot on the >>> same system works fine. The crash occurs during amd_smn_init due >>> to a divide-by-zero exception. That looks like the same issue I am trying to fix. >>> There is a potentially related bug report discussing a Linux patch >>> addressing AMD SMN initialization under Xen PVH: >>> >>> https://patchew.org/linux/20260623211904.3674-1-jason.andryuk@amd.com/ >>> >>> It seems there was an ongoing discussion between Linux devs who >>> seem to have the need to align with Xen devs for a proper/future-proof fix. >>> I am submitting this report to share raw hardware trace data and >>> help move this forward. Yes, there was some discussion, but we have agreed on an approach. >> [1] https://patchew.org/linux/20260814214255.83127-1-jason.andryuk@amd.com/20260814214255.83127-2-jason.andryuk@amd.com/ This v2 is basically what was suggested by a maintainer, so it should be picked up - hopefully soon. Regards, Jason