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Wed, 15 Apr 2026 14:17:50 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , Subject: [PATCH rc v2 0/5] iommu/arm-smmu-v3: Fix device crash on kdump kernel Date: Wed, 15 Apr 2026 14:17:35 -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: BN3PEPF0000B078:EE_|LV2PR12MB999073:EE_ X-MS-Office365-Filtering-Correlation-Id: c8983f1a-c0fc-4e97-393a-08de9b3480ff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|82310400026|36860700016|1800799024|13003099007|56012099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(376014)(82310400026)(36860700016)(1800799024)(13003099007)(56012099003)(18002099003);DIR:OUT;SFP:1101; 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Currently, the SMMU driver aggressively resets the hardware during probe by clearing CR0_SMMUEN and setting the Global Bypass Attribute (GBPA) to ABORT. In a kdump scenario, this aggressive reset is highly destructive: a) If GBPA is set to ABORT, in-flight DMA will be aborted, generating fatal PCIe AER or SErrors that may panic the kdump kernel b) If GBPA is set to BYPASS, in-flight DMA targeting some IOVAs will bypass the SMMU and corrupt the physical memory at those 1:1 mapped IOVAs. To safely absorb in-flight DMA, the kdump kernel must leave SMMUEN=1 intact and avoid modifying STRTAB_BASE. This allows HW to continue translating in- flight DMA using the crashed kernel's page tables until the endpoint device drivers probe and quiesce their respective hardware. However, the ARM SMMUv3 architecture specification states that updating the SMMU_STRTAB_BASE register while SMMUEN == 1 is UNPREDICTABLE or ignored. This leaves a kdump kernel no choice but to adopt the stream table from the crashed kernel. In this series: - Introduce an ARM_SMMU_OPT_KDUMP - Skip SMMUEN and STRTAB_BASE resets in arm_smmu_device_reset() - Map the crashed kernel's stream tables into the kdump kernel [*] - Defer any default domain attachment to retain STEs until device drivers explicitly request it. [*] This is implemented via memremap, which only works on a coherent SMMU. Note that the entire series requires Jason's work that was merged in v6.12: 85196f54743d ("iommu/arm-smmu-v3: Reorganize struct arm_smmu_strtab_cfg"). I have a backported version that is verified with a v6.8 kernel. I can send if we see a strong need after this version is accepted. This is on Github: https://github.com/nicolinc/iommufd/commits/smmuv3_kdump-v2 Changelog v2 * Add warning in non-coherent SMMU cases * Keep eventq/priq disabled v.s. enabling-and-disabling-later * Check KDUMP option in the beginning of arm_smmu_device_reset() * Validate STRTAB format matches HW capability instead of forcing flags v1: https://lore.kernel.org/all/cover.1775763475.git.nicolinc@nvidia.com/ Nicolin Chen (5): iommu/arm-smmu-v3: Add arm_smmu_adopt_strtab() for kdump iommu/arm-smmu-v3: Implement is_attach_deferred() for kdump iommu/arm-smmu-v3: Retain CR0_SMMUEN during kdump device reset iommu/arm-smmu-v3: Skip EVTQ/PRIQ setup in kdump kernel iommu/arm-smmu-v3: Detect ARM_SMMU_OPT_KDUMP in arm_smmu_device_hw_probe() drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 225 ++++++++++++++++++-- 2 files changed, 207 insertions(+), 19 deletions(-) -- 2.43.0