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Fri, 11 Sep 2026 15:31:31 -0700 Date: Fri, 11 Sep 2026 15:31:28 -0700 From: Nicolin Chen To: Breno Leitao CC: Will Deacon , Robin Murphy , "Joerg Roedel (AMD)" , , , , , , , , Subject: Re: [PATCH 0/2] iommu/arm-smmu-v3: SMMU hitting kdump mid-air Message-ID: References: <20260911-smmu_fix_aws-v1-0-75870bf9655b@debian.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260911-smmu_fix_aws-v1-0-75870bf9655b@debian.org> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00022570:EE_|DS7PR12MB8372:EE_ X-MS-Office365-Filtering-Correlation-Id: a869bd19-7c45-46ea-48f5-08df1054785e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|7416014|23010399003|1800799024|82310400026|13003099007|18002099003|6133799003|10067099003|11063799006|22082099003|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 2sHbxPeUNB3++pMx/DgqAFOJU6UitU9Hks7OnUDqjC2pVn8A9Ym7jmnBhOJnDlYVjexfBq0j+bTZfg50vaDa5G277wc/A4Tsi/shBQUX78UZzenWa9rGqApfjsVq5OO/vFa9FddGyLD44YcuAgNWjK2n09Wuvvh64VgOCh8UiQoLGWCBnwmhQo83oMADVfIIsayDuT184TclptKtHy8RmrgiTSEYYYZvrxPZ5QB+2ZQWfyD3XF4KGmYnm5fQ1UnGvheuolUBrJ/Cre/+xlPA0bS+3anrqVahZ3G4ri/Zche6hJS0PgmWsOOy7tdXhBMDnpI96oOkSw7Rh6a4gVM76rCKVw6XhfGPLXd5qOewwePw4vDtDg/8Wl2UdPAvMNXeOUK+wQ5GUgYaLRTjmBmZk+jgquTpGO+vYEhG5BdrVH8t7KkIf4Qn05SiehOZWCkB X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2026 22:31:49.0710 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a869bd19-7c45-46ea-48f5-08df1054785e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF00022570.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8372 On Fri, Sep 11, 2026 at 07:54:43AM -0700, Breno Leitao wrote: > My lovely robot and I came with two patches that solved the problem, > from a practical perspective and I want to share what has been tested. > > Patch 1 carries the previous kernel's L1 descriptors into the new KDUMP table, so > those streams keep translating. > > Patch 2 stops the core discarding that again: iommu_dma_init() already > enables deferred attach for a capture kernel, but the core only honours > it for drivers implementing .is_attach_deferred, which until now meant > amd and intel. Without it iommu_setup_default_domain() attaches > a default domain at probe and the fault returns as F_TRANSLATION. > > The x86 IOMMU drivers solve the same/similar problem the same way; see > commit 38e5f33ee3596 ("iommu/amd: Reuse device table for kdump"). This looks like my bigger series: https://lore.kernel.org/linux-iommu/cover.1788130528.git.nicolinc@nvidia.com/ Would you please help check/test? Thanks Nicolin