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Received: from CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) by DS0PR12MB7678.namprd12.prod.outlook.com (2603:10b6:8:135::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8069.17; Thu, 17 Oct 2024 18:47:30 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%4]) with mapi id 15.20.8069.016; Thu, 17 Oct 2024 18:47:30 +0000 Date: Thu, 17 Oct 2024 15:47:29 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: kevin.tian@intel.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, yi.l.liu@intel.com, aik@amd.com, patches@lists.linux.dev Subject: Re: [PATCH v3 02/16] iommufd/viommu: Add a default_viommu_ops for IOMMU_VIOMMU_TYPE_DEFAULT Message-ID: <20241017184729.GR3559746@nvidia.com> References: Content-Type: text/plain; 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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, Oct 09, 2024 at 09:38:14AM -0700, Nicolin Chen wrote: > An IOMMU_VIOMMU_TYPE_DEFAULT doesn't need a free() op since the core can > free everything in the destroy(). Now with the new vDEVICE structure, it > might want to allocate its own vDEVICEs. > > Add a default_viommu_ops for driver to hook ops for default vIOMMUs. Why? arm_smmu is now creating its own viommu object, so who will use this? Do we have any use for the default mode? It is already a bit confusing, can we just drop it? Jason