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Wysocki" , Len Brown , Dat Mach , , , Subject: Re: [PATCH v2 0/3] ACPI: arm64: FFH Operation Region support for FF-A (offset 2) Date: Wed, 23 Sep 2026 10:32:40 -0700 Message-ID: <20260923173240.3710620-1-jamien@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260923-lurking-pony-of-fascination-ac6c49@sudeepholla> References: <20260901192906.133670-1-jamien@nvidia.com> <20260922-purring-fennec-of-exercise-bbce5e@sudeepholla> <20260922155211.676134-1-jamien@nvidia.com> <20260922-exuberant-earwig-of-opportunity-4fecff@sudeepholla> <20260923124050.3270801-1-jamien@nvidia.com> <20260923-lurking-pony-of-fascination-ac6c49@sudeepholla> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B06C:EE_|LV3PR12MB9259:EE_ X-MS-Office365-Filtering-Correlation-Id: aca38474-8598-4b92-9f5b-08df1998bac2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|7416014|36860700016|82310400026|376014|1800799024|10067099003|11063799006|56012099006|4143699003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(23010399003)(7416014)(36860700016)(82310400026)(376014)(1800799024)(10067099003)(11063799006)(56012099006)(4143699003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: VNRCn00G35G9WO5SPE3DOO8GJVXu1zFUnYvZyPKL25+LQlSqaTex5KliwUy9jyGfuUtDV538c16N2k3wRPNPPL0HjC5YwNhO2F+VlwvfAvo30QKqoVnKADx7VDPtgfioWs2V4oPERt/9qQmWJgxiWxur1Rab+BXsE/EDqMNvBsjptiqaYDgsskDD6Ibl5YEiPIiqQHcqNXM4i1CVTJM2tM+GE5BAAPGlPMx/CwOe0yDQ7OKiHFXRkSOkwlszxqn2lvutjyAeup49aGtvoJjT+DkUjgtBayLKVke6wFVjHqNk+ueihZWGhlxAF1Q9OqamwQ9BdqvHHMhxixoM5G/okanciuxkQqRTmcpk7Q9u/YuY33F6dZiqAPvf2dGEo9nFpvP7AjVJTFR7FLZC3W4Pk8qYzH+xbtUvznrxdNnUX2C+31be6XiLOSsZRrXuba8X X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2026 17:33:06.7156 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: aca38474-8598-4b92-9f5b-08df1998bac2 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: BN3PEPF0000B06C.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR12MB9259 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260923_183321_512252_ACA0A095 X-CRM114-Status: GOOD ( 14.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Sep 23, 2026 at 02:38:28PM +0100, Sudeep Holla wrote: > I did try to come up something simpler and independent last evening and > this morning, far from completion and I am also thinking of 2 main changes > to it yet: > 1. Maintain hash for receiver ID list > 2. Drop the whole FFA_VERSION fuss as it must be dealt with in UEFI and > that should be sufficient. > > Of course not tested yet and even not sure this version is compile tested. Thanks, this looks much simpler. I can confirm that both patches apply to v7.3-rc4 and build W=1 clean with ARM_FFA_TRANSPORT=y, =m and =n. The =n vmlinux also links with no transport-driver symbols pulled in. On FFA_VERSION: as written, if the transport driver has already mapped its RX/TX buffers, I think DEN0077A R0216 has this negotiation return the Null version, so offset 2 would report NOT_SUPPORTED for any AML run after the driver probes. But if it's dropped, I don't think it's guaranteed that a compatible version will have been negotiated by then, right? [...] > + memcpy(&args.a4, &buf[4], len - 4 * sizeof(u64)); This would trip CONFIG_FORTIFY_SOURCE's field-spanning write check whenever the region has more than one payload register. I think this would cover that case: memcpy((void *)&args + offsetof(struct arm_smccc_1_2_regs, a4), &buf[4], len - 4 * sizeof(u64));