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Fri, 25 Oct 2024 09:17:33 -0700 Date: Fri, 25 Oct 2024 09:17:32 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "jgg@nvidia.com" , "will@kernel.org" , "joro@8bytes.org" , "suravee.suthikulpanit@amd.com" , "robin.murphy@arm.com" , "dwmw2@infradead.org" , "baolu.lu@linux.intel.com" , "shuah@kernel.org" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kselftest@vger.kernel.org" , "eric.auger@redhat.com" , "jean-philippe@linaro.org" , "mdf@kernel.org" , "mshavit@google.com" , "shameerali.kolothum.thodi@huawei.com" , "smostafa@google.com" , "Liu, Yi L" , "aik@amd.com" , "zhangfei.gao@linaro.org" , "patches@lists.linux.dev" Subject: Re: [PATCH v4 04/11] iommufd/viommu: Add IOMMU_VIOMMU_ALLOC ioctl Message-ID: References: <9da2cf334a182ced4d4ffa578b87889e9c0856f3.1729553811.git.nicolinc@nvidia.com> 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: BL02EPF00029928:EE_|IA0PR12MB7532:EE_ X-MS-Office365-Filtering-Correlation-Id: a702fcb1-6767-4945-60a2-08dcf510913a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|7416014|1800799024|82310400026|376014; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Oct 2024 16:17:48.2540 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a702fcb1-6767-4945-60a2-08dcf510913a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00029928.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7532 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241025_091754_121712_A6AD5CAC X-CRM114-Status: GOOD ( 10.23 ) 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 Fri, Oct 25, 2024 at 09:05:58AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Tuesday, October 22, 2024 8:19 AM > > + > > + viommu->type = cmd->type; > > + viommu->ictx = ucmd->ictx; > > + viommu->hwpt = hwpt_paging; > > + /* Assume physical IOMMUs are unpluggable (the most likely case) > > */ > > + viommu->iommu_dev = __iommu_get_iommu_dev(idev->dev); > > + > > so what would happen if this assumption breaks? I had a very verbose comments previously that Alexey suggested to optimize away.. Perhaps I should add back the part that mentions adding a refcount for pluggable ones.. Nicolin