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Thu, 12 Nov 2026 21:44:23 -0800 Received: from nvidia.com (10.127.8.14) by mail.nvidia.com (10.129.68.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.56 via Frontend Transport; Thu, 12 Nov 2026 21:44:21 -0800 Date: Thu, 12 Nov 2026 21:44:20 -0800 From: Nicolin Chen To: Mostafa Saleh CC: , , , , , , , , , , , , , , , , Subject: Re: [PATCH v9 11/25] iommu/arm-smmu-v3-kvm: Add the kernel driver Message-ID: References: <20261015200903.2735565-1-smostafa@google.com> <20261015200903.2735565-12-smostafa@google.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF00018867:EE_|IA4PR12MB9787:EE_ X-MS-Office365-Filtering-Correlation-Id: d9c3544a-408d-4a3e-95c8-08df41bd499f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|376014|23010399003|1800799024|36860700016|18002099003|22082099003|4143699003|11063799006|261026140227099003|56012099006|261028144727099003|261022105027099003|10067099003|261009223027099003|261021135927099003|261022075727099003|261026121527099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: osLOfVODl1ubX94GzuJkmgwVaG/39o/acf1xjfFqQ5+d5SDblt4W3T1MnebsF3uO2nq6f1UuCChs2XzkCFPG/XhlsOYhHvWTPYQ7ZgGkz4EVzkVl9+xXxlc1EgY+tp26xAZ4phy3wjtiiiNXSVLfLn0GYagAfDrIvVQoHtttEpxt1phjTKeq77GqXTId6QN9beLkLPz50wDa+fxf1L6IW983QRXB8h2Fit1bOvgHDtV8wO5zWrxFAmhn8yP1EDwLTw2ARErgeYnzRN7aE3HZsRJr4miL1nlbdDy7RCVmpB7UXBr10as66iDwYGAY830ucEbBD9E8LPQAf9mje9OuJSGGD3O+COVTuHrfpZN0l0anJ1Mn+2/pCqZSkUSi8YtSD0ZeW/EDgt/dll7YYke2WVvRmZzhLRadHwO4bn9MIKihvRmI80wsQH1Ht6d7Lbht X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Nov 2026 19:35:34.8679 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d9c3544a-408d-4a3e-95c8-08df41bd499f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF00018867.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA4PR12MB9787 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261113_115928_702132_4B4D3587 X-CRM114-Status: GOOD ( 15.89 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-5.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu, Nov 12, 2026 at 01:32:36PM +0000, Mostafa Saleh wrote: > On Tue, Nov 10, 2026 at 10:24:58AM -0800, Nicolin Chen wrote: > > You might want to double check a dual-SMMU case, where one gets > > accepted by pkvm driver and the other fails and so bound to the > > main driver. > > > > It seems the pkvm driver would still pkvm_iommu_register_driver > > and carry on with an untrusted SMMU. Would it also clear the FW > > and mark the system as not trusted? > > > > That shouldn't be possible, if one SMMU fail the whole thing will > and the driver should clean up after as the probe is done through: > ret = platform_driver_probe(&smmuv3_nesting_driver, smmuv3_nesting_probe); If I read __platform_driver_probe correctly: * __driver_attach() doesn't propagate ret from driver_probe_device() via bus_for_each_dev to the caller * bus_for_each_dev(..., is_bound_to_driver) at the end also returns true, as one SMMU is bound to the driver while the other failed. ? Nicolin