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header.from=amd.com; Received: from CH3PR12MB9194.namprd12.prod.outlook.com (2603:10b6:610:19f::7) by SA1PR12MB6969.namprd12.prod.outlook.com (2603:10b6:806:24c::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8093.16; Fri, 25 Oct 2024 05:32:22 +0000 Received: from CH3PR12MB9194.namprd12.prod.outlook.com ([fe80::53fb:bf76:727f:d00f]) by CH3PR12MB9194.namprd12.prod.outlook.com ([fe80::53fb:bf76:727f:d00f%4]) with mapi id 15.20.8069.020; Fri, 25 Oct 2024 05:32:20 +0000 Message-ID: <487ebe2c-718f-405c-8f20-213eab59ca0f@amd.com> Date: Fri, 25 Oct 2024 16:32:10 +1100 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH v4 00/14] iommufd: Add vIOMMU infrastructure (Part-2: vDEVICE) Content-Language: en-US To: Nicolin Chen Cc: jgg@nvidia.com, 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, 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MR-646709E3 X-CRM114-CacheID: sfid-20241024_223231_604504_F5CC8E5E X-CRM114-Status: GOOD ( 18.85 ) 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 25/10/24 15:59, Nicolin Chen wrote: > On Fri, Oct 25, 2024 at 03:54:44PM +1100, Alexey Kardashevskiy wrote: >> On 22/10/24 11:20, Nicolin Chen wrote: >>> Following the previous vIOMMU series, this adds another vDEVICE structure, >>> representing the association from an iommufd_device to an iommufd_viommu. >>> This gives the whole architecture a new "v" layer: >>> _______________________________________________________________________ >>> | iommufd (with vIOMMU/vDEVICE) | >>> | _____________ _____________ | >>> | | | | | | >>> | |----------------| vIOMMU |<---| vDEVICE |<------| | >>> | | | | |_____________| | | >>> | | ______ | | _____________ ___|____ | >>> | | | | | | | | | | | >>> | | | IOAS |<---|(HWPT_PAGING)|<---| HWPT_NESTED |<--| DEVICE | | >>> | | |______| |_____________| |_____________| |________| | >>> |______|________|______________|__________________|_______________|_____| >>> | | | | | >>> ______v_____ | ______v_____ ______v_____ ___v__ >>> | struct | | PFN | (paging) | | (nested) | |struct| >>> |iommu_device| |------>|iommu_domain|<----|iommu_domain|<----|device| >>> |____________| storage|____________| |____________| |______| >>> >>> This vDEVICE object is used to collect and store all vIOMMU-related device >>> information/attributes in a VM. As an initial series for vDEVICE, add only >>> the virt_id to the vDEVICE, which is a vIOMMU specific device ID in a VM: >>> e.g. vSID of ARM SMMUv3, vDeviceID of AMD IOMMU, and vID of Intel VT-d to >>> a Context Table. This virt_id helps IOMMU drivers to link the vID to a pID >>> of the device against the physical IOMMU instance. This is essential for a >>> vIOMMU-based invalidation, where the request contains a device's vID for a >>> device cache flush, e.g. ATC invalidation. >>> >>> Therefore, with this vDEVICE object, support a vIOMMU-based invalidation, >>> by reusing IOMMUFD_CMD_HWPT_INVALIDATE for a vIOMMU object to flush cache >>> with a given driver data. >>> >>> As for the implementation of the series, add driver support in ARM SMMUv3 >>> for a real world use case. >>> >>> This series is on Github: >>> https://github.com/nicolinc/iommufd/commits/iommufd_viommu_p2-v4 >>> >>> For testing, try this "with-rmr" branch: >>> https://github.com/nicolinc/iommufd/commits/iommufd_viommu_p2-v4-with-rmr >> >> Is there any real example of a .vdevice_alloc hook, besides the >> selftests? It is not in iommufd_viommu_p2-v4-with-rmr, hence the >> question. I am trying to sketch something with this new machinery and >> less guessing would be nice. Thanks, > > No, I am actually dropping that one, and moving the vdevice struct > to the private header, as there seems to be no use case: Why keep it then? > https://lore.kernel.org/linux-iommu/ZxsSYbK3gqyC84U7@Asurada-Nvidia/ > https://lore.kernel.org/linux-iommu/ZxsTAANTTuQzQ9HR@Asurada-Nvidia/ > > Do you need vdevice_alloc in the driver for your sketch? At the moment one of the things I am looking for is a place to add tsm_bind(host_bdfn, guest_bdfn, kvm_vmid). I assumed that this vdevice represents the guest's IOMMU attributes for a passed through device and naturally stores the guest_bdfn as an id (for AMD). I am still trying to wrap my head around these new things. Thanks, -- Alexey