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Tue, 14 Jul 2026 13:55:10 -0700 From: Nicolin Chen To: Will Deacon CC: Robin Murphy , "Joerg Roedel (AMD)" , Jason Gunthorpe , , , , Subject: [PATCH v2 00/11] iommu/tegra241-cmdqv: Fix error-interrupt races and VINTF lifecycle bugs Date: Tue, 14 Jul 2026 13:54:57 -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: BL02EPF0001A0F9:EE_|PH7PR12MB9204:EE_ X-MS-Office365-Filtering-Correlation-Id: b4172345-6663-485f-df2d-08dee1ea3e67 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|36860700016|1800799024|82310400026|376014|11063799006|56012099006|5023799004|18002099003|6133799003|13003099007; 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)(23010399003)(36860700016)(1800799024)(82310400026)(376014)(11063799006)(56012099006)(5023799004)(18002099003)(6133799003)(13003099007);DIR:OUT;SFP:1101; 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The patches are ordered roughly most-critical-first, so some later ones fix smaller pre-existing issues in the same functions that earlier patches touch. Issues fixed: - the error ISR racing VINTF (de)init and reading a NULL, freed, or not yet fully initialized slot - the probe fallback dereferencing an smmu freed by devm_krealloc() - a guest vSID programmed without validating its width or the device's Stream ID count - VINTF0 leaked on an init-failure path - error-map index/bounds handling and a VCMDQ base above the 48-bit limit - the error ISR flooding the kernel log under repeated guest errors False positives raised by Sashiko: - a viommu outliving an SMMU unbind and touching freed memory on close: a physical IOMMU is not a pluggable device, so iommufd holds no reference on the one behind a viommu, and this teardown cannot arise. - the ISR running after cmdqv is freed on probe failure: free_irq() runs first from tegra241_cmdqv_remove(), the devm device_remove action, which devres invokes before the cmdqv allocation is released. - a guest never acking its VCMDQ error wedging the shared interrupt: the interrupt is edge-signaled per event, and the host ISR only snapshots the error map into the guest's bounded vEVENTQ, never depending on a guest-side GERRORN ack. - the ISR accessing a de-assigned LVCMDQ page after a VINTF hw_init() failure: the page remains a mapped MMIO region backed by empty registers, so reads are benign and writes are dropped. In parallel to Shameer's Tegra241 CMDQV CMD_SYNC use-after-free fix: https://lore.kernel.org/all/20260629094106.251694-1-skolothumtho@nvidia.com/ This is on github: https://github.com/nicolinc/iommufd/commits/fix_cmdqv_sashiko-v2 Changelog v2 * Return -EOPNOTSUPP in tegra241_vintf_init_vsid v1 https://lore.kernel.org/all/cover.1783054570.git.nicolinc@nvidia.com/ Nicolin Chen (11): iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized iommu/tegra241-cmdqv: Synchronize the error ISR against VINTF (de)init iommu/tegra241-cmdqv: Harden error-map index handling in the error ISR iommu/tegra241-cmdqv: Don't run the error ISR before probe sets up vintfs iommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc() iommu/tegra241-cmdqv: Free the error IRQ before tearing down VINTFs iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID iommu/tegra241-cmdqv: Fix VINTF0 leak on the init-failure path iommu/tegra241-cmdqv: Warn on a VCMDQ base above the 48-bit hardware limit iommu/tegra241-cmdqv: Rate-limit the error ISR's log message .../iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 224 ++++++++++++------ 1 file changed, 156 insertions(+), 68 deletions(-) -- 2.43.0