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Mon, 21 Oct 2024 17:20:03 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v4 03/11] iommufd: Add iommufd_verify_unfinalized_object Date: Mon, 21 Oct 2024 17:19:25 -0700 Message-ID: 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: BN1PEPF00005FFC:EE_|IA1PR12MB8262:EE_ X-MS-Office365-Filtering-Correlation-Id: 66f47bef-1b55-49b3-6579-08dcf22f50db X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700013|7416014|376014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(36860700013)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Oct 2024 00:20:21.1676 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 66f47bef-1b55-49b3-6579-08dcf22f50db 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: BN1PEPF00005FFC.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8262 To support driver-allocated vIOMMU objects, it's suggested to call the allocator helper in IOMMU dirvers. However, there is no guarantee that drivers will all use it and allocate objects properly. Add a helper for iommufd core to verify if an unfinalized object is at least reserved in the ictx. Signed-off-by: Nicolin Chen Reviewed-by: Kevin Tian --- drivers/iommu/iommufd/iommufd_private.h | 3 +++ drivers/iommu/iommufd/main.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 5bd41257f2ef..d53c1ca75532 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -152,6 +152,9 @@ static inline void iommufd_put_object(struct iommufd_ctx *ictx, wake_up_interruptible_all(&ictx->destroy_wait); } +int iommufd_verify_unfinalized_object(struct iommufd_ctx *ictx, + struct iommufd_object *to_verify); + void iommufd_object_abort(struct iommufd_ctx *ictx, struct iommufd_object *obj); void iommufd_object_abort_and_destroy(struct iommufd_ctx *ictx, struct iommufd_object *obj); diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 92bd075108e5..e244fed1b7ab 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -89,6 +89,26 @@ struct iommufd_object *iommufd_get_object(struct iommufd_ctx *ictx, u32 id, return obj; } +int iommufd_verify_unfinalized_object(struct iommufd_ctx *ictx, + struct iommufd_object *to_verify) +{ + XA_STATE(xas, &ictx->objects, 0); + struct iommufd_object *obj; + int rc = 0; + + if (!to_verify || !to_verify->id) + return -EINVAL; + xas.xa_index = to_verify->id; + + xa_lock(&ictx->objects); + obj = xas_load(&xas); + /* Being an unfinalized object, the loaded obj is a reserved space */ + if (obj != XA_ZERO_ENTRY) + rc = -ENOENT; + xa_unlock(&ictx->objects); + return rc; +} + static int iommufd_object_dec_wait_shortterm(struct iommufd_ctx *ictx, struct iommufd_object *to_destroy) {