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Tue, 1 Sep 2026 17:21:41 -0700 Date: Tue, 1 Sep 2026 17:21:39 -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> <20260901174230.GA2847102@ziepe.ca> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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: BL02EPF00021F6B:EE_|CY8PR12MB7244:EE_ X-MS-Office365-Filtering-Correlation-Id: 634f601d-89ee-4319-3299-08df088836cf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|7416014|376014|82310400026|23010399003|10067099003|4143699003|11063799006|56012099006|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: uHVlPydCjn/f2Gw40iHis/iGTwSS8eyMH7fcL2rK2e/WknzD3cOT4C1QEfuxXw+izpOUfeMg0Y68nwU0nKW8V5z2M0DxM7bKe+CSuslnKDHf04fO4rzyfeJUkFCsqxTqyLSCdjXvcn5OW8q5clY1HPujs5BgYoFRdi0v2OD5oziftu+xAIcg0QzTU5Mf5g5jI3ryOu7w7GSgE1czxlg22jpxMJxcBsThKUM06IUiqArTEh4hu3kqAX9F+Ry9RTGK4vBsEEZNALTs/wq4M4JVWdQ2yiQJKaAqgNbuqp6CsNSinDquTxqPpV4ZrA7LcoNRQ3YaGUapGS1FYHniECEufbBo1VRg6FCrmdMLXuW9EqSqCGgHjK4EdPiW20unFyiMk1jpQCUKGeUIF9dTMN6KnWawb5ixSEz41RL4J5UQaQWNafmZdbWgr9PtY1+n/mM3 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Sep 2026 00:22:03.6180 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 634f601d-89ee-4319-3299-08df088836cf 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: BL02EPF00021F6B.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7244 On Tue, Sep 01, 2026 at 12:12:22PM -0700, Nicolin Chen wrote: > On Tue, Sep 01, 2026 at 02:42:30PM -0300, Jason Gunthorpe wrote: > > On Tue, Sep 01, 2026 at 10:13:04AM -0700, Nicolin Chen wrote: > > Is there anything more than RMI_VSMMU_CREATE needed from a RMM > > perspective? What about that dpt/ats stuff? > > DPT is a bit hacky currently.. > > Prior to RMM v2.0 ABI, DPT was allocated statically in RMM; there > was no RMI command for DPT allocations. > > Now, with RMM v2.0 ABI, DPT can be managed via RMIs. I am making > it follow GPT at this point, similar to the static idea. But, in > the long run, I will think of decoupling, but I haven't looked at > that closely. Did a quick check. It's clear. DPT is a system-wise global thing, not per SMMU or per realm. Each table or entry is indexed by part of 48-bit in PA corresponding to to a protected IPA. One thing that is related to a realm is a VMID in the leaf entry. So, it should unlikely be coupling with VSMMU. The other stuff is to map VSMMU's MMIO region in its IPA space but it should be a part of the VSMMU-CREATE package. Nicolin