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Thu, 5 Nov 2026 13:06:26 -0800 Received: from nvidia.com (10.127.8.13) by mail.nvidia.com (10.129.68.6) 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, 5 Nov 2026 13:06:21 -0800 Date: Thu, 5 Nov 2026 13:06:18 -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: <20261015200903.2735565-12-smostafa@google.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PEPF00000042:EE_|IA4PR12MB9785:EE_ X-MS-Office365-Filtering-Correlation-Id: de21331c-00ea-411a-5487-08df3b80b2fd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|376014|1800799024|23010399003|7416014|22082099003|18002099003|6133799003|10067099003|56012099006|4143699003|11063799006|261102123227099003|261026140227099003|261026121527099003|261021121427099003|261028144727099003|261021135927099003|261021123027099003|261009223027099003|261022075727099003|261022105027099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: NAaA4ymnz/9lMUzS84GJm7W6C4UsOvPayYrLfwLu/ezLpuo1CiF/Z1xJvMA5hCqibH/tn403UNw8v9K08THaiTZp37o9FXS/GAsvEdgC+WHFHNAjJDXT2evhjiC4MfKbGtd8HY038hrA+tKwH5dnPuvpy2T9/Q1NiCXQNDO8fW87wncmW4xtPVD2+4qYDI0Y+1TlX7IIx/EITVPqS7LiRxGbTcSzsAVR6mR3v7vDVgdE1BFLhVXjALPYeAOkbkUCZGzlXLIDrbS3V+hW7T9mZ9/SpDn8zYbi4GpyDwCPKTFXOohfCx2j8Rzo2fxRkW6HySLDRFKcgx84KBOg1a2RBVWaKc0JAZ1/KTmCt7sQj4h/qmqheakXLQYd5sCQHeqrOfzTzBQU8N+RSz6a4RE/9Gy8qoEGGHpdLmJ/x1O9Wm3suxmkxuJS5gEjDsK1k8OS X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Nov 2026 21:06:45.2728 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: de21331c-00ea-411a-5487-08df3b80b2fd 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: IA0PEPF00000042.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA4PR12MB9785 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261105_130651_339519_54EB8A31 X-CRM114-Status: GOOD ( 16.82 ) 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=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham 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, Oct 15, 2026 at 08:08:42PM +0000, Mostafa Saleh wrote: > +static struct platform_driver smmuv3_nesting_driver; > +static int __init smmuv3_nesting_probe(struct platform_device *pdev) Could it use a different naming than "nesting"? "Nesting" is widely used in iommufd path for nested translation. Here, it could be smmuv3_pkvm_driver? > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +#ifdef CONFIG_ARM_SMMU_V3_PKVM > +/* > + * Two devices are involved: the aux device bound to this driver, and the > + * physical platform device bound to the pKVM init driver, which only uses it > + * for discovery. This driver keeps using the platform device, as it carries > + * the fwnode the IOMMU core and consumers link to, the DMA configuration and > + * the IRQs. It would be nicer to have a diagram or so to show the co-relationship among different devices and drivers. I assume the regular arm-smmu-v3 driver is a part of the picture too, when the pkvm driver binding fails? > +static struct auxiliary_driver arm_smmu_driver_emu = { > + .driver = { > + .suppress_bind_attrs = true, > + }, > + .name = "arm-smmu-v3-emu", > + .id_table = arm_smmu_aux_table, > + .probe = arm_smmu_device_probe_emu, > + .remove = arm_smmu_device_remove_emu, > + .shutdown = arm_smmu_device_shutdown_emu, > +}; > + > +module_auxiliary_driver(arm_smmu_driver_emu); > +#endif Nit: #endif /* CONFIG_ARM_SMMU_V3_PKVM */ Nicolin