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Mon, 29 Jun 2026 14:16:37 -0700 From: Nicolin Chen To: Jason Gunthorpe , Kevin Tian CC: Will Deacon , Robin Murphy , , , , Subject: [PATCH v1 0/3] iommufd: Fix vDEVICE allocation lifecycle bugs Date: Mon, 29 Jun 2026 14:16:23 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 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: CO1PEPF000066E7:EE_|CHAPR12MB999247:EE_ X-MS-Office365-Filtering-Correlation-Id: cfa752bf-fb6b-4bf6-752a-08ded623c0b7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|376014|36860700016|82310400026|13003099007|18002099003|11063799006|56012099006; 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)(1800799024)(23010399003)(376014)(36860700016)(82310400026)(13003099007)(18002099003)(11063799006)(56012099006);DIR:OUT;SFP:1101; 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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 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-v1 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 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 15 +++++++++++++++ drivers/iommu/iommufd/viommu.c | 17 +++++++++++------ 2 files changed, 26 insertions(+), 6 deletions(-) base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482 -- 2.43.0