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Tue, 27 Aug 2024 10:01:32 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , Subject: [PATCH v2 02/19] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU_ALLOC ioctl Date: Tue, 27 Aug 2024 09:59:39 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D3:EE_|DS7PR12MB6119:EE_ X-MS-Office365-Filtering-Correlation-Id: 2793cb74-2c66-4838-fade-08dcc6b9ee4c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|7416014|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(376014)(36860700013)(7416014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Aug 2024 17:01:44.7945 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2793cb74-2c66-4838-fade-08dcc6b9ee4c 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: CY4PEPF0000E9D3.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6119 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240827_100154_023576_570D3FA8 X-CRM114-Status: GOOD ( 21.70 ) 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 Add a new IOMMUFD_OBJ_VIOMMU with an iommufd_viommu structure to represent a vIOMMU instance in the user space, backed by a physical IOMMU for its HW accelerated virtualization feature, such as nested translation support for a multi-viommu-instance VM, NVIDIA CMDQ-Virtualization extension for ARM SMMUv3, and AMD Hardware Accelerated Virtualized IOMMU (vIOMMU). Also, add a new ioctl for user space to do a viommu allocation. It must be based on a nested parent HWPT, so take its refcount. As an initial version, support a viommu of IOMMU_VIOMMU_TYPE_DEFAULT type. IOMMUFD core can use this viommu to store a virtual device ID lookup table in a following patch. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/Makefile | 3 +- drivers/iommu/iommufd/iommufd_private.h | 12 +++++ drivers/iommu/iommufd/main.c | 6 +++ drivers/iommu/iommufd/viommu.c | 72 +++++++++++++++++++++++++ include/uapi/linux/iommufd.h | 30 +++++++++++ 5 files changed, 122 insertions(+), 1 deletion(-) create mode 100644 drivers/iommu/iommufd/viommu.c diff --git a/drivers/iommu/iommufd/Makefile b/drivers/iommu/iommufd/Makefile index cf4605962bea..df490e836b30 100644 --- a/drivers/iommu/iommufd/Makefile +++ b/drivers/iommu/iommufd/Makefile @@ -7,7 +7,8 @@ iommufd-y := \ ioas.o \ main.o \ pages.o \ - vfio_compat.o + vfio_compat.o \ + viommu.o iommufd-$(CONFIG_IOMMUFD_TEST) += selftest.o diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 5d3768d77099..154f7ba5f45c 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -131,6 +131,7 @@ enum iommufd_object_type { IOMMUFD_OBJ_IOAS, IOMMUFD_OBJ_ACCESS, IOMMUFD_OBJ_FAULT, + IOMMUFD_OBJ_VIOMMU, #ifdef CONFIG_IOMMUFD_TEST IOMMUFD_OBJ_SELFTEST, #endif @@ -526,6 +527,17 @@ static inline int iommufd_hwpt_replace_device(struct iommufd_device *idev, return iommu_group_replace_domain(idev->igroup->group, hwpt->domain); } +struct iommufd_viommu { + struct iommufd_object obj; + struct iommufd_ctx *ictx; + struct iommufd_hwpt_paging *hwpt; + + unsigned int type; +}; + +int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd); +void iommufd_viommu_destroy(struct iommufd_object *obj); + #ifdef CONFIG_IOMMUFD_TEST int iommufd_test(struct iommufd_ucmd *ucmd); void iommufd_selftest_destroy(struct iommufd_object *obj); diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index b5f5d27ee963..288ee51b6829 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -333,6 +333,7 @@ union ucmd_buffer { struct iommu_ioas_unmap unmap; struct iommu_option option; struct iommu_vfio_ioas vfio_ioas; + struct iommu_viommu_alloc viommu; #ifdef CONFIG_IOMMUFD_TEST struct iommu_test_cmd test; #endif @@ -384,6 +385,8 @@ static const struct iommufd_ioctl_op iommufd_ioctl_ops[] = { val64), IOCTL_OP(IOMMU_VFIO_IOAS, iommufd_vfio_ioas, struct iommu_vfio_ioas, __reserved), + IOCTL_OP(IOMMU_VIOMMU_ALLOC, iommufd_viommu_alloc_ioctl, + struct iommu_viommu_alloc, out_viommu_id), #ifdef CONFIG_IOMMUFD_TEST IOCTL_OP(IOMMU_TEST_CMD, iommufd_test, struct iommu_test_cmd, last), #endif @@ -519,6 +522,9 @@ static const struct iommufd_object_ops iommufd_object_ops[] = { [IOMMUFD_OBJ_FAULT] = { .destroy = iommufd_fault_destroy, }, + [IOMMUFD_OBJ_VIOMMU] = { + .destroy = iommufd_viommu_destroy, + }, #ifdef CONFIG_IOMMUFD_TEST [IOMMUFD_OBJ_SELFTEST] = { .destroy = iommufd_selftest_destroy, diff --git a/drivers/iommu/iommufd/viommu.c b/drivers/iommu/iommufd/viommu.c new file mode 100644 index 000000000000..200653a4bf57 --- /dev/null +++ b/drivers/iommu/iommufd/viommu.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES + */ + +#include "iommufd_private.h" + +void iommufd_viommu_destroy(struct iommufd_object *obj) +{ + struct iommufd_viommu *viommu = + container_of(obj, struct iommufd_viommu, obj); + + refcount_dec(&viommu->hwpt->common.obj.users); +} + +int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd) +{ + struct iommu_viommu_alloc *cmd = ucmd->cmd; + struct iommufd_hwpt_paging *hwpt_paging; + struct iommufd_viommu *viommu; + struct iommufd_device *idev; + int rc; + + if (cmd->flags) + return -EOPNOTSUPP; + + idev = iommufd_get_device(ucmd, cmd->dev_id); + if (IS_ERR(idev)) + return PTR_ERR(idev); + + hwpt_paging = iommufd_get_hwpt_paging(ucmd, cmd->hwpt_id); + if (IS_ERR(hwpt_paging)) { + rc = PTR_ERR(hwpt_paging); + goto out_put_idev; + } + + if (!hwpt_paging->nest_parent) { + rc = -EINVAL; + goto out_put_hwpt; + } + + if (cmd->type != IOMMU_VIOMMU_TYPE_DEFAULT) { + rc = -EOPNOTSUPP; + goto out_put_hwpt; + } + + viommu = iommufd_object_alloc(ucmd->ictx, viommu, IOMMUFD_OBJ_VIOMMU); + if (IS_ERR(viommu)) { + rc = PTR_ERR(viommu); + goto out_put_hwpt; + } + + viommu->type = cmd->type; + viommu->ictx = ucmd->ictx; + viommu->hwpt = hwpt_paging; + + refcount_inc(&viommu->hwpt->common.obj.users); + + cmd->out_viommu_id = viommu->obj.id; + rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd)); + if (rc) + goto out_abort; + iommufd_object_finalize(ucmd->ictx, &viommu->obj); + goto out_put_hwpt; + +out_abort: + iommufd_object_abort_and_destroy(ucmd->ictx, &viommu->obj); +out_put_hwpt: + iommufd_put_object(ucmd->ictx, &hwpt_paging->common.obj); +out_put_idev: + iommufd_put_object(ucmd->ictx, &idev->obj); + return rc; +} diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index cd4920886ad0..ac77903b5cc4 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -51,6 +51,7 @@ enum { IOMMUFD_CMD_HWPT_GET_DIRTY_BITMAP = 0x8c, IOMMUFD_CMD_HWPT_INVALIDATE = 0x8d, IOMMUFD_CMD_FAULT_QUEUE_ALLOC = 0x8e, + IOMMUFD_CMD_VIOMMU_ALLOC = 0x8f, }; /** @@ -852,4 +853,33 @@ struct iommu_fault_alloc { __u32 out_fault_fd; }; #define IOMMU_FAULT_QUEUE_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_FAULT_QUEUE_ALLOC) + +/** + * enum iommu_viommu_type - Virtual IOMMU Type + * @IOMMU_VIOMMU_TYPE_DEFAULT: Core-managed VIOMMU type + */ +enum iommu_viommu_type { + IOMMU_VIOMMU_TYPE_DEFAULT = 0, +}; + +/** + * struct iommu_viommu_alloc - ioctl(IOMMU_VIOMMU_ALLOC) + * @size: sizeof(struct iommu_viommu_alloc) + * @flags: Must be 0 + * @type: Type of the virtual IOMMU. Must be defined in enum iommu_viommu_type + * @dev_id: The device to allocate this virtual IOMMU for + * @hwpt_id: ID of a nesting parent HWPT to associate to + * @out_viommu_id: Output virtual IOMMU ID for the allocated object + * + * Allocate a virtual IOMMU object that holds a (shared) nesting parent HWPT + */ +struct iommu_viommu_alloc { + __u32 size; + __u32 flags; + __u32 type; + __u32 dev_id; + __u32 hwpt_id; + __u32 out_viommu_id; +}; +#define IOMMU_VIOMMU_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VIOMMU_ALLOC) #endif