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Wed, 11 Sep 2024 00:08:05 -0700 Date: Wed, 11 Sep 2024 00:08:03 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "jgg@nvidia.com" , "will@kernel.org" , "joro@8bytes.org" , "suravee.suthikulpanit@amd.com" , "robin.murphy@arm.com" , "dwmw2@infradead.org" , "baolu.lu@linux.intel.com" , "shuah@kernel.org" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kselftest@vger.kernel.org" , "eric.auger@redhat.com" , "jean-philippe@linaro.org" , "mdf@kernel.org" , "mshavit@google.com" , "shameerali.kolothum.thodi@huawei.com" , "smostafa@google.com" , "Liu, Yi L" Subject: Re: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1) Message-ID: References: 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: CO1PEPF000044FB:EE_|IA1PR12MB7734:EE_ X-MS-Office365-Filtering-Correlation-Id: 800da0db-0f93-4579-419a-08dcd23086be X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|82310400026|36860700013; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2024 07:08:23.9865 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 800da0db-0f93-4579-419a-08dcd23086be X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044FB.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7734 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240911_000832_514281_8BFDAC45 X-CRM114-Status: GOOD ( 18.15 ) 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 Wed, Sep 11, 2024 at 06:12:21AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Wednesday, August 28, 2024 1:00 AM > > > [...] > > On a multi-IOMMU system, the VIOMMU object can be instanced to the > > number > > of vIOMMUs in a guest VM, while holding the same parent HWPT to share > > the > > Is there restriction that multiple vIOMMU objects can be only created > on a multi-IOMMU system? I think it should be generally restricted to the number of pIOMMUs, although likely (not 100% sure) we could do multiple vIOMMUs on a single-pIOMMU system. Any reason for doing that? > > stage-2 IO pagetable. Each VIOMMU then just need to only allocate its own > > VMID to attach the shared stage-2 IO pagetable to the physical IOMMU: > > this reads like 'VMID' is a virtual ID allocated by vIOMMU. But from the > entire context it actually means the physical 'VMID' allocated on the > associated physical IOMMU, correct? Quoting Jason's narratives, a VMID is a "Security namespace for guest owned ID". The allocation, using SMMU as an example, should be a part of vIOMMU instance allocation in the host SMMU driver. Then, this VMID will be used to mark the cache tags. So, it is still a software allocated ID, while HW would use it too. Thanks Nicolin