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Tue, 1 Sep 2026 10:18:34 -0700 Date: Tue, 1 Sep 2026 10:18:33 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Aneesh Kumar K.V , , , , , Alexey Kardashevskiy , "Catalin Marinas" , Dan Williams , Joerg Roedel , Jonathan Cameron , "Marc Zyngier" , Pranjal Shrivastava , "Robin Murphy" , Samuel Ortiz , "Steven Price" , Suzuki K Poulose , "Will Deacon" , Xu Yilun Subject: Re: [RFC PATCH v4 03/16] iommu/arm-smmu-v3: Add initial pSMMU realm viommu plumbing Message-ID: References: <20260427085344.941627-1-aneesh.kumar@kernel.org> <20260427085344.941627-4-aneesh.kumar@kernel.org> <20260901143445.GC56830@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002BA4D:EE_|DS7PR12MB6094:EE_ X-MS-Office365-Filtering-Correlation-Id: c1a96151-1672-40ed-bdaf-08df084d1ffc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|376014|7416014|23010399003|1800799024|10067099003|56012099006|4143699003|11063799006|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: HruBIGFzd6D5eQUrI0/AX6ItOIyxt+lotmIw8Q0nif9+3Hd+7kSWRHV4T7HVTVASVDJLpVyPdvUkXHgZFC1cz14zgr5U5pzUrnfnlYloVQhuwlo2WQpBAHwHTb43Xhllef8v13FvtDmq3HjjBLQzaqhyjPD09c5kMJlh92TTQNq0gXwecbNuqm8v7CHt14kx0tzOMpVW22wx+eF7uCivmG6giSmAiZVlsRYGFLAN7YymtOMUyeoIBV2vu+k9q7Xzfrwp4H0IWLf3oz+9uObpVdY9Rf+Kjh/tsrgalcF9kwhyReZi5Owikvb2SNOWDBBnk6kh6ZC+W9HfSk6DY+jsommBu2uaoamO6n5jcWqEpcEdMdU5gJ3ZStbD/DfGxWzkoHZz+QoLGJjek4P+juTkw+vWdQajciS8TlFdMH7/JpYeCnvYZ91FeNn1ELMy+3EG X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2026 17:19:05.0690 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c1a96151-1672-40ed-bdaf-08df084d1ffc 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: SN1PEPF0002BA4D.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6094 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260901_101919_707001_BB34D200 X-CRM114-Status: GOOD ( 23.36 ) 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 On Tue, Sep 01, 2026 at 10:13:11AM -0700, Nicolin Chen wrote: > On Tue, Sep 01, 2026 at 11:34:45AM -0300, Jason Gunthorpe wrote: > > On Tue, Sep 01, 2026 at 03:36:37PM +0530, Aneesh Kumar K.V wrote: > > > > > @@ -463,14 +460,13 @@ > > > vsmmu->vmid = s2_parent->s2_cfg.vmid; > > > > > > if (viommu->type == IOMMU_VIOMMU_TYPE_ARM_SMMUV3) { > > > + if (arm_smmu_is_realm_viommu(viommu)) > > > + return arm_realm_smmu_v3_init(viommu, user_data); > > > + > > > > I think the realm vsmmu is going to require a different info struct > > than the normal psmmu case, isn't it? > > > > If so it needs its own enum value. > > > > It would be nice to see a draft patch showing how the real vsmmu works > > on top of the RMM spec for it. If we are using a viommu object then > > non-vsmmu case should be identical just with an option in the info > > struct to not create the vsmmu object. > > Actually, the PSMMU-only viommu object in this series only adds a > type with no viommu data structure. > > I've drafted the vsmmu case on top of the series, so it would add > a structure reusing the same IOMMU_VIOMMU_TYPE_ARM_SMMUV3 with a > flag: Oh. I replied too fast that I didn't notice this is under the standard IOMMU_VIOMMU_TYPE_ARM_SMMUV3 used by non-secure vSTE. That doesn't look correct for a no-vsmmu case.. Nicolin