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Mon, 28 Oct 2024 13:18:51 -0700 Date: Mon, 28 Oct 2024 13:18:50 -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 v5 01/13] iommufd/viommu: Add IOMMUFD_OBJ_VDEVICE and IOMMU_VDEVICE_ALLOC ioctl Message-ID: References: <53025c827c44d68edb6469bfd940a8e8bc6147a5.1729897278.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: MN1PEPF0000ECD8:EE_|DM6PR12MB4268:EE_ X-MS-Office365-Filtering-Correlation-Id: 33bbfe33-d547-4cce-169a-08dcf78dd735 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|7416014|376014|82310400026|1800799024; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Oct 2024 20:19:35.0766 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 33bbfe33-d547-4cce-169a-08dcf78dd735 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000ECD8.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4268 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241028_131946_880940_8F7D0F31 X-CRM114-Status: GOOD ( 16.51 ) 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 Mon, Oct 28, 2024 at 03:11:32AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Saturday, October 26, 2024 7:51 AM > > > > + > > +/** > > + * struct iommu_vdevice_alloc - ioctl(IOMMU_VDEVICE_ALLOC) > > + * @size: sizeof(struct iommu_vdevice_alloc) > > + * @viommu_id: vIOMMU ID to associate with the virtual device > > + * @dev_id: The pyhsical device to allocate a virtual instance on the > > vIOMMU > > s/pyhsical/physical/, or just say 'iommufd device" Ack for "physical", aligning with other @dev_id lines. > > + > > +int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd) > > +{ > > + struct iommu_vdevice_alloc *cmd = ucmd->cmd; > > + struct iommufd_vdevice *vdev, *curr; > > + struct iommufd_viommu *viommu; > > + struct iommufd_device *idev; > > + u64 virt_id = cmd->virt_id; > > + int rc = 0; > > + > > + if (virt_id > ULONG_MAX) > > + return -EINVAL; > > + > > + viommu = iommufd_get_viommu(ucmd, cmd->viommu_id); > > + if (IS_ERR(viommu)) > > + return PTR_ERR(viommu); > > + > > + idev = iommufd_get_device(ucmd, cmd->dev_id); > > + if (IS_ERR(idev)) { > > + rc = PTR_ERR(idev); > > + goto out_put_viommu; > > + } > > + > > + mutex_lock(&idev->igroup->lock); > > + if (idev->vdev) { > > + rc = -EEXIST; > > + goto out_unlock_igroup; > > + } > > + > > + vdev = iommufd_object_alloc(ucmd->ictx, vdev, > > IOMMUFD_OBJ_VDEVICE); > > + if (IS_ERR(vdev)) { > > + rc = PTR_ERR(vdev); > > + goto out_unlock_igroup; > > + } > > + > > also need to check that the device and the viommu are associated > to a same physical iommu. Ack. Will add this prior to mutex_lock(&idev->igroup->lock); + if (viommu->iommu_dev != __iommu_get_iommu_dev(idev->dev)) { + rc = -EINVAL; + goto out_put_idev; + } Thanks! Nicolin