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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 0kjiUbkg00o/YDqpjzg211BdfEIAuU4aecjcTyugKow/PCKqK1pKU14mIatXQvZ2RAQ3KaF055w+tekVx8SkmlFbM6ZpBcxHX0fU6CeRW+SZ4+dAbSHs3Ty+HmSnoDi1OcsAp+4bOF5sqHJT3PTUrHictwgDmSpXP/ulPTAm6X+14DMP9LH0rW90MnrKxm2/3WTZdO1Pu5igB+JGvNUqjoTyMgGMNj1PJir/Cg7C2F7RiES7vnKyKbqFMIDlGtOcovsky/HQoybsSPYtB/XKTK53LMn1DgKeFYshgM/NSkPpQnUIgSS8pzxuMldetWeEO3yBV3cR13xaiHAdEtIKAIdRa5LJJ2onJKQDgFgZFl+LHr9q5ZRXHJXPhTdRa6DHo54jSz3HY3/Qm84HqfurU7vZ52JyLdsF9pzXHm9DX6Z6tZLRYM0TfC6X3ALKNSFi X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2026 21:11:53.7088 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e276aac9-0e49-4cb0-32d2-08df39ef15f2 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: PH3PEPF00059618.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7233 On Tue, Nov 03, 2026 at 05:39:07PM +0000, Sudeep Holla wrote: [...] > + if (!acpi_ffh_ffa_version_negotiated) { > + args.a0 = FFA_VERSION; > + args.a1 = FFA_VERSION_1_2; Same question as on the earlier thread: how does this work if the transport driver has already negotiated a version? [...] > + ret = acpi_ffh_ffa_features(ffh_ctxt, FFA_PARTITION_INFO_GET_REGS); > + if (ret) > + goto out; I think REGS is only needed when X1 is zero, and if I understand correctly it's optional at the Non-secure physical instance. Would it make sense to check it in the lookup path instead, so an explicit receiver ID still works without it? [...] > + memcpy(&args.a4, &buf[4], len - 4 * sizeof(u64)); I believe this would trip FORTIFY_SOURCE's field-spanning write check. So I suggest: memcpy((void *)&args + offsetof(struct arm_smccc_1_2_regs, a4), &buf[4], len - 4 * sizeof(u64));