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Sun, 5 Jul 2026 22:36:31 -0700 From: Nicolin Chen To: Will Deacon , Jason Gunthorpe CC: Robin Murphy , , Kevin Tian , , , Subject: [PATCH v2 0/3] iommufd: Fix vDEVICE allocation lifecycle bugs Date: Sun, 5 Jul 2026 22:36:08 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE3D:EE_|MW9PR12MB999210:EE_ X-MS-Office365-Filtering-Correlation-Id: ca8edf67-020f-4741-a1ef-08dedb209572 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|23010399003|36860700016|1800799024|13003099007|56012099006|11063799006|5023799004|18002099003; 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)(376014)(23010399003)(36860700016)(1800799024)(13003099007)(56012099006)(11063799006)(5023799004)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: rohNwAFs3eOIyxcPMrtequE9T5AWZytrZ/hpoO0oWU/pFBm3QYNqsByfRQjrW0EJ+h/OnxrPN2bUqYgtxCYc6nSU2Noze2YD//Wp3GcGFNcTRnrY45ubN7x8v89Mg0mWVaVFB0LtohexSFXifDq89gG7c6PgYnm8jjlFmo2yvpmg7prlDD/6CGb+xYOCAQrNzK/fyuGl4dHCGCBb3Xx/FlSCXccx60sT5iUk29NO+aMHXl2/zFoutoNdKljdYNBJx8afAtRT2zo5Dii8UDL3t29+DbUsWHS136GoTJsbN7rAGlIdzugdKa7/9osPEKW9OGf6A0DGCZqse1jymPm4/bquGC7lKjQ2EhLd9ucTZSg+93jOusYRGG+3cJmpGPX9k1kXf9kUONGAITESukuiTzuCgrTtuNEhy3t2UzlM5NrjPOHd+4fcKlcyyDqMGKZT X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jul 2026 05:36:52.4772 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ca8edf67-020f-4741-a1ef-08dedb209572 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: CY4PEPF0000EE3D.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW9PR12MB999210 Sashiko flagged a few bugs in how IOMMU_VDEVICE_ALLOC creates and validates a vDEVICE on a vIOMMU: - the core publishes a vDEVICE into the vIOMMU xarray before the driver's vdevice_init() runs, so a concurrent invalidation can reach one it has not yet accepted; - the undersized-vdevice_size guard returns holding the igroup mutex, deadlocking later vDEVICE operations on that group; - the Arm SMMUv3 vIOMMU accepts a device without exactly one Stream ID: an out-of-bounds streams[] read for none, stale ATC/IOTLB for several. Fix each of them properly. This is on Github: https://github.com/nicolinc/iommufd/commits/fix_vdevice_sashiko-v2 Changelog v2 * Add "Reviewed-by" from Kevin * Patch-2: Add "Cc stable"; drop the out_release label by inlining the xa_release() call * Patch-2: Note that the reserved slot is hidden only via xa_* helpers * Patch-3: Return -EOPNOTSUPP instead of -EINVAL v1 https://lore.kernel.org/all/cover.1782767110.git.nicolinc@nvidia.com/ Nicolin Chen (3): iommufd/viommu: Release the igroup lock on the vdevice_size error path iommufd/viommu: Publish a vDEVICE only after vdevice_init() succeeds iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 15 +++++++++++++ drivers/iommu/iommufd/viommu.c | 22 ++++++++++++++----- 2 files changed, 31 insertions(+), 6 deletions(-) -- 2.43.0