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Wed, 11 Sep 2024 00:47:33 -0700 Date: Wed, 11 Sep 2024 00:47:31 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: Jason Gunthorpe , "Williams, Dan J" , "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 06/19] iommufd/viommu: Add IOMMU_VIOMMU_SET/UNSET_VDEV_ID ioctl Message-ID: References: <6348cc7a72ce9f2ac0e9caf9737e70177a01eb74.1724776335.git.nicolinc@nvidia.com> <20240905160353.GP1358970@nvidia.com> <20240905174326.GW1358970@nvidia.com> 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: CH2PEPF00000140:EE_|IA0PR12MB8088:EE_ X-MS-Office365-Filtering-Correlation-Id: 0de26e96-ac91-4835-3f18-08dcd2360a7b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|1800799024|36860700013; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2024 07:47:52.4277 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0de26e96-ac91-4835-3f18-08dcd2360a7b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000140.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8088 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240911_004759_092104_C3EA807B X-CRM114-Status: GOOD ( 22.61 ) 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 07:18:52AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Wednesday, September 11, 2024 3:12 PM > > > > On Wed, Sep 11, 2024 at 06:19:10AM +0000, Tian, Kevin wrote: > > > > From: Nicolin Chen > > > > Sent: Friday, September 6, 2024 4:15 AM > > > > > > > > On Thu, Sep 05, 2024 at 02:43:26PM -0300, Jason Gunthorpe wrote: > > > > > On Thu, Sep 05, 2024 at 10:37:45AM -0700, Nicolin Chen wrote: > > > > > > That being said, if we have a clear picture that in the long term > > > > > > we would extend it to hold more information, I think it could be > > > > > > a smart move. > > > > > > > > > > > > Perhaps virtual device can have its own "attach" to vIOMMU? Or > > > > > > would you still prefer attaching via proxy hwpt_nested? > > > > > > > > > > I was thinking just creating it against a vIOMMU is an effective > > > > > "attach" and the virtual device is permanently tied to the vIOMMU at > > > > > creation time. > > > > > > > > Ah, right! The create is per-viommu, so it's being attached. > > > > > > > > > > presumably we also need check compatibility between the idev > > > which the virtual device is created against and the stage-2 pgtable, > > > as a normal attach required? > > > > If that's required, it can be a part of "create virtual device", > > where idev and viommu (holding s2 hwpt) would be all available? > > > > yes Oh, I misread your question actually. I think it's about a matching validation between dev->iommu->iommu_dev and vIOMMU->iommu_dev. Thanks Nicolin