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Fri, 25 Oct 2024 16:50:09 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v5 06/13] iommufd: Allow pt_id to carry viommu_id for IOMMU_HWPT_ALLOC Date: Fri, 25 Oct 2024 16:49:46 -0700 Message-ID: <4f5ed9d75c23a503ffe672a85cf9010569652794.1729897352.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000075ED:EE_|SA0PR12MB7477:EE_ X-MS-Office365-Filtering-Correlation-Id: 617f5c88-4f17-4511-b55a-08dcf54fc958 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700013|1800799024|82310400026; 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)(376014)(7416014)(36860700013)(1800799024)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Oct 2024 23:50:20.8242 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 617f5c88-4f17-4511-b55a-08dcf54fc958 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: CO1PEPF000075ED.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB7477 Now a vIOMMU holds a shareable nesting parent HWPT. So, it can act like that nesting parent HWPT to allocate a nested HWPT. Support that in the IOMMU_HWPT_ALLOC ioctl handler, and update its kdoc. Also, add an iommufd_hwpt_nested_alloc_for_viommu helper to allocate a nested HWPT for a vIOMMU object. Since a vIOMMU object holds the parent hwpt's refcount already, increase the refcount of the vIOMMU only. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_private.h | 1 + include/uapi/linux/iommufd.h | 14 ++--- drivers/iommu/iommufd/hw_pagetable.c | 71 ++++++++++++++++++++++++- 3 files changed, 79 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 9adf8d616796..8c9ab35eaea5 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -288,6 +288,7 @@ struct iommufd_hwpt_paging { struct iommufd_hwpt_nested { struct iommufd_hw_pagetable common; struct iommufd_hwpt_paging *parent; + struct iommufd_viommu *viommu; }; static inline bool hwpt_is_paging(struct iommufd_hw_pagetable *hwpt) diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 3d320d069654..717659b9fdce 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -430,7 +430,7 @@ enum iommu_hwpt_data_type { * @size: sizeof(struct iommu_hwpt_alloc) * @flags: Combination of enum iommufd_hwpt_alloc_flags * @dev_id: The device to allocate this HWPT for - * @pt_id: The IOAS or HWPT to connect this HWPT to + * @pt_id: The IOAS or HWPT or vIOMMU to connect this HWPT to * @out_hwpt_id: The ID of the new HWPT * @__reserved: Must be 0 * @data_type: One of enum iommu_hwpt_data_type @@ -449,11 +449,13 @@ enum iommu_hwpt_data_type { * IOMMU_HWPT_DATA_NONE. The HWPT can be allocated as a parent HWPT for a * nesting configuration by passing IOMMU_HWPT_ALLOC_NEST_PARENT via @flags. * - * A user-managed nested HWPT will be created from a given parent HWPT via - * @pt_id, in which the parent HWPT must be allocated previously via the - * same ioctl from a given IOAS (@pt_id). In this case, the @data_type - * must be set to a pre-defined type corresponding to an I/O page table - * type supported by the underlying IOMMU hardware. + * A user-managed nested HWPT will be created from a given vIOMMU (wrapping a + * parent HWPT) or a parent HWPT via @pt_id, in which the parent HWPT must be + * allocated previously via the same ioctl from a given IOAS (@pt_id). In this + * case, the @data_type must be set to a pre-defined type corresponding to an + * I/O page table type supported by the underlying IOMMU hardware. The device + * via @dev_id and the vIOMMU via @pt_id must be associated to the same IOMMU + * instance. * * If the @data_type is set to IOMMU_HWPT_DATA_NONE, @data_len and * @data_uptr should be zero. Otherwise, both @data_len and @data_uptr diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index d06bf6e6c19f..1df5d40c93df 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -57,7 +57,10 @@ void iommufd_hwpt_nested_destroy(struct iommufd_object *obj) container_of(obj, struct iommufd_hwpt_nested, common.obj); __iommufd_hwpt_destroy(&hwpt_nested->common); - refcount_dec(&hwpt_nested->parent->common.obj.users); + if (hwpt_nested->viommu) + refcount_dec(&hwpt_nested->viommu->obj.users); + else + refcount_dec(&hwpt_nested->parent->common.obj.users); } void iommufd_hwpt_nested_abort(struct iommufd_object *obj) @@ -260,6 +263,56 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx, return ERR_PTR(rc); } +/** + * iommufd_viommu_alloc_hwpt_nested() - Get a hwpt_nested for a vIOMMU + * @viommu: vIOMMU ojbect to associate the hwpt_nested/domain with + * @user_data: user_data pointer. Must be valid + * + * Allocate a new IOMMU_DOMAIN_NESTED for a vIOMMU and return it as a NESTED + * hw_pagetable. + */ +static struct iommufd_hwpt_nested * +iommufd_viommu_alloc_hwpt_nested(struct iommufd_viommu *viommu, u32 flags, + const struct iommu_user_data *user_data) +{ + struct iommufd_hwpt_nested *hwpt_nested; + struct iommufd_hw_pagetable *hwpt; + int rc; + + if (flags) + return ERR_PTR(-EOPNOTSUPP); + if (!viommu->ops || !viommu->ops->alloc_domain_nested) + return ERR_PTR(-EOPNOTSUPP); + + hwpt_nested = __iommufd_object_alloc( + viommu->ictx, hwpt_nested, IOMMUFD_OBJ_HWPT_NESTED, common.obj); + if (IS_ERR(hwpt_nested)) + return ERR_CAST(hwpt_nested); + hwpt = &hwpt_nested->common; + + hwpt_nested->viommu = viommu; + hwpt_nested->parent = viommu->hwpt; + refcount_inc(&viommu->obj.users); + + hwpt->domain = viommu->ops->alloc_domain_nested(viommu, user_data); + if (IS_ERR(hwpt->domain)) { + rc = PTR_ERR(hwpt->domain); + hwpt->domain = NULL; + goto out_abort; + } + hwpt->domain->owner = viommu->iommu_dev->ops; + + if (WARN_ON_ONCE(hwpt->domain->type != IOMMU_DOMAIN_NESTED)) { + rc = -EINVAL; + goto out_abort; + } + return hwpt_nested; + +out_abort: + iommufd_object_abort_and_destroy(viommu->ictx, &hwpt->obj); + return ERR_PTR(rc); +} + int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) { struct iommu_hwpt_alloc *cmd = ucmd->cmd; @@ -316,6 +369,22 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) goto out_unlock; } hwpt = &hwpt_nested->common; + } else if (pt_obj->type == IOMMUFD_OBJ_VIOMMU) { + struct iommufd_hwpt_nested *hwpt_nested; + struct iommufd_viommu *viommu; + + viommu = container_of(pt_obj, struct iommufd_viommu, obj); + if (viommu->iommu_dev != __iommu_get_iommu_dev(idev->dev)) { + rc = -EINVAL; + goto out_unlock; + } + hwpt_nested = iommufd_viommu_alloc_hwpt_nested( + viommu, cmd->flags, &user_data); + if (IS_ERR(hwpt_nested)) { + rc = PTR_ERR(hwpt_nested); + goto out_unlock; + } + hwpt = &hwpt_nested->common; } else { rc = -EINVAL; goto out_put_pt;