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Thu, 12 Jun 2025 10:35:28 -0700 Date: Thu, 12 Jun 2025 10:35:26 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: Baolu Lu , "jgg@nvidia.com" , "will@kernel.org" , "robin.murphy@arm.com" , "joro@8bytes.org" , "ddutile@redhat.com" , "Liu, Yi L" , "peterz@infradead.org" , "jsnitsel@redhat.com" , "praan@google.com" , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "patches@lists.linux.dev" Subject: Re: [PATCH v1 08/12] iommufd/viommu: Replace ops->viommu_alloc with ops->viommu_init Message-ID: References: <5586990446e4c97827b5a195622ec0f8cf9d2d67.1749488870.git.nicolinc@nvidia.com> <663c7eee-5a3a-48e5-8bed-8abad62f3484@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E1:EE_|PH7PR12MB6562:EE_ X-MS-Office365-Filtering-Correlation-Id: 5cac4c95-cd97-4f89-2397-08dda9d790de X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024|7053199007; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jun 2025 17:35:46.8083 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5cac4c95-cd97-4f89-2397-08dda9d790de X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E1.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6562 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250612_103626_390673_BCBB026D X-CRM114-Status: GOOD ( 23.67 ) 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 Thu, Jun 12, 2025 at 08:22:49AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Tuesday, June 10, 2025 2:20 PM > > > > On Tue, Jun 10, 2025 at 01:55:05PM +0800, Baolu Lu wrote: > > > On 6/10/25 01:13, Nicolin Chen wrote: > > > > To ease the for-driver iommufd APIs, get_viommu_size and viommu_init > > ops > > > > are introduced. Now, those existing vIOMMU supported drivers > > implemented > > > > these two ops too. > > > > > > > > Relace the ops->viommu_alloc call with the two new ones. > > > > > > > > Note that this will fail a !viommu->ops case from now on, since a > > vIOMMU > > > > is expected to support alloc_domain_nested at least. > > > > > > Does this mean that the viommu implementation in the iommu driver is > > > required to implement alloc_domain_nested? I suppose viommu should > > soon > > > be extended to support TEE/IO. > > > > It's a good point that CCA might not need a nested domain. So, > > it's inaccurate to say that, although I suspect that CCA would > > need some other viommu op then the check here would be sane. > > > > With that being said, it's probably not worth adding that until > > we are 100% sure that no case will work with a !viommu->ops, so > > let's drop this new rejection, since we haven't had it so far. > > > > WARN_ON_ONCE() is built on the current context, not the future > usage. So I'd prefer to keeping it until there is a real need to revert. > > Reviewed-by: Kevin Tian Okay. And I can make the commit message clearer. Thanks Nicolin