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Lu Baolu says: ==================== This series implements the functionality of delivering IO page faults to user space through the IOMMUFD framework. One feasible use case is the nested translation. Nested translation is a hardware feature that supports two-stage translation tables for IOMMU. The second-stage translation table is managed by the host VMM, while the first-stage translation table is owned by user space. This allows user space to control the IOMMU mappings for its devices. When an IO page fault occurs on the first-stage translation table, the IOMMU hardware can deliver the page fault to user space through the IOMMUFD framework. User space can then handle the page fault and respond to the device top-down through the IOMMUFD. This allows user space to implement its own IO page fault handling policies. User space application that is capable of handling IO page faults should allocate a fault object, and bind the fault object to any domain that it is willing to handle the fault generatd for them. On a successful return of fault object allocation, the user can retrieve and respond to page faults by reading or writing to the file descriptor (FD) returned. The iommu selftest framework has been updated to test the IO page fault delivery and response functionality. ==================== * iommufd_pri: iommufd/selftest: Add coverage for IOPF test iommufd/selftest: Add IOPF support for mock device iommufd: Associate fault object with iommufd_hw_pgtable iommufd: Fault-capable hwpt attach/detach/replace iommufd: Add iommufd fault object iommufd: Add fault and response message definitions iommu: Extend domain attach group with handle support iommu: Add attach handle to struct iopf_group iommu: Remove sva handle list iommu: Introduce domain attachment handle Link: https://lore.kernel.org/all/20240702063444.105814-1-baolu.lu@linux.intel.com Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>