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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: qSDuLOTL7b029s8Lk5p6ANocMhJHH9du2yEVaJyGxG/s+w/ae/wgncOswevKI941oweQj8DHwjygJ8oXL+BQ9zspzq2cBhq8EelDoHH0DwEPXFh0XQwX2+XYmOdJvlElMuL4S5eZmn+CGowB2o2Gvvzl3E9h4yVEWfvcqW2j40ZlABR6NQW+C5LfhUDpHszR8nPPAdKymP86WBpBVpCbHD6X90VXOVJLYZXb8Z+Ac4zHiniZnCvCVAsC9jj0PsMM2RUtkUQilr1GPKORUyPQN7LT/5XIn8kQVfScYsUV+tDsgbOtaUhvcDCjB0BcEMt+VE1AF52SpKvI5cCqtohwy1H0KFw/d7atSwZTJMrD0BUEFD6iLMFZW9MPBNBeFQnI2JmsQ3C9LNF15oRBlEggqUC3wuuxyXl7cu7GPI9wez34edJs8qAiZlFtiE4xLylB X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Nov 2026 17:01:52.6664 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e2fe712b-fe92-4ec2-d401-08df3a955311 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM3PEPF000265B9.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS4PR12MB9660 On Wed, Nov 04, 2026 at 09:40:08AM +0000, Sudeep Holla wrote: > Handling this coordination is difficult, which prompted my earlier query about > requiring v1.3 as a baseline. On ACPI platforms, this initialization conflict > is already an inherent issue, as the UEFI or early bootloader might negotiate > a version before the kernel FF-A driver probes. I welcome any feedback or > proposals on how we might cleanly resolve or track this pre-negotiated state. >From the kernel side: the transport driver and ffh.c are the same FF-A caller from firmware's point of view. Could a small built-in helper call FFA_VERSION once, under a mutex, and keep the effective negotiated version? Both would use it, with the transport's existing compatibility handling, so it wouldn't matter which runs first. I haven't been able to think of a clean solution for the bootloader case, though. It looks like the same hole the transport already has today, since the helper would negotiate the way ffa_version_check() does now.