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authorJason Gunthorpe <jgg@nvidia.com>2022-11-29 23:31:50 +0300
committerJason Gunthorpe <jgg@nvidia.com>2022-12-02 18:52:03 +0300
commit2a3dab19a0a6c1823645764188776f271de1b3cf (patch)
tree605950ffb3143873914fd431f165051f8d94e07b /drivers/vfio/platform/vfio_amba.c
parent0d8227b622f3529661ad6a9702a52932e149a30d (diff)
downloadlinux-2a3dab19a0a6c1823645764188776f271de1b3cf.tar.xz
vfio-iommufd: Allow iommufd to be used in place of a container fd
This makes VFIO_GROUP_SET_CONTAINER accept both a vfio container FD and an iommufd. In iommufd mode an IOAS will exist after the SET_CONTAINER, but it will not be attached to any groups. For VFIO this means that the VFIO_GROUP_GET_STATUS and VFIO_GROUP_FLAGS_VIABLE works subtly differently. With the container FD the iommu_group_claim_dma_owner() is done during SET_CONTAINER but for IOMMUFD this is done during VFIO_GROUP_GET_DEVICE_FD. Meaning that VFIO_GROUP_FLAGS_VIABLE could be set but GET_DEVICE_FD will fail due to viability. As GET_DEVICE_FD can fail for many reasons already this is not expected to be a meaningful difference. Reorganize the tests for if the group has an assigned container or iommu into a vfio_group_has_iommu() function and consolidate all the duplicated WARN_ON's etc related to this. Call container functions only if a container is actually present on the group. Link: https://lore.kernel.org/r/5-v4-42cd2eb0e3eb+335a-vfio_iommufd_jgg@nvidia.com Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Tested-by: Alex Williamson <alex.williamson@redhat.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Tested-by: Yi Liu <yi.l.liu@intel.com> Tested-by: Lixiao Yang <lixiao.yang@intel.com> Tested-by: Matthew Rosato <mjrosato@linux.ibm.com> Tested-by: Yu He <yu.he@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/vfio/platform/vfio_amba.c')
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