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Sun, 19 Jul 2026 13:37:21 -0700 Date: Sun, 19 Jul 2026 13:37:20 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Ashish Mhetre , , , , , , , , , , , Subject: Re: [PATCH v7 2/3] iommu/arm-smmu-v3: Introduce CFGI/TLBI-repeat workaround infrastructure Message-ID: References: <20260714104202.1664187-1-amhetre@nvidia.com> <20260714104202.1664187-3-amhetre@nvidia.com> <20260717201841.GC701389@ziepe.ca> <20260718164548.GI701389@ziepe.ca> 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: <20260718164548.GI701389@ziepe.ca> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000075F2:EE_|MW3PR12MB4409:EE_ X-MS-Office365-Filtering-Correlation-Id: 4ebb697f-8fb7-479e-c9b8-08dee5d59167 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|23010399003|1800799024|36860700016|7416014|376014|10067099003|3023799007|4143699003|56012099006|11063799006|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: CevySDUtz5abSAfgg+aOQTarJxy64kIyVtnMQrekS/kBlfVPmSMEC1dEX2bb7Rf1oOsnVrnVoV261ixlLvnQNodI+DcmyawlLV1Kq1FqTJkJOpQyClNxfHbTgIedH+KfWHONPhGhlMhM3wXQuCqZ/WUm6RI3aNF8zSD3JQZT/4pL+OqmruqUh7MMUFN6o1nC/ygeyPMF6fGsOiF8VdnMqs82RsNhrPC1vxvuEINESa5MpLFFrooZqbqyuehCBQI0GvHHf6h9K4Ar1T001+kAmHVBfabzmL53XvQWDF2lZ4dfEYq0D6ZYOZrjVyE92pGlK92c09Epu0CUvlexvkE507y7gYr4RF57ap6vqrRbCfBMQKpVKWLuJouUCC8mn+S2rQUWUL0hAIK/ncyDBa6Pc9FlUkq4Oaf5fQVvg7T1X1ezlMdPMwUqjwTPiwHQRxhX X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jul 2026 20:37:36.2486 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4ebb697f-8fb7-479e-c9b8-08dee5d59167 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: CO1PEPF000075F2.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4409 On Sat, Jul 18, 2026 at 01:45:48PM -0300, Jason Gunthorpe wrote: > On Fri, Jul 17, 2026 at 02:16:53PM -0700, Nicolin Chen wrote: > > Given the use cases on Tegra264, instead of patching the iommufd > > path as this patch does, perhaps we should simply spit a WARN in > > arm_vsmmu_init(): > > Nope, in this case you need to make the errata discoverable through > the viommu info so the VMM can validate the right DT is used, or apply > the WAR itself before submitting commands to the kernel. OK. > Some kind of new flag in the viommu struct I guess struct iommu_hw_info_arm_smmuv3 has an unused "flags" field: /** * enum iommu_hw_info_smmuv3_flags - Flags for ARM SMMUv3 hw_info * @IOMMU_HW_INFO_SMMUV3_ERRATA_REPEAT_TLBI_CFGI: If set, user space must issue * TLBI/CFGI+SYNC commands twice * due to a hardware erratum: * */ enum iommu_hw_info_smmuv3_flags { IOMMU_HW_INFO_SMMUV3_ERRATA_REPEAT_TLBI_CFGI = 1 << 0, }; Thanks Nicolin