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This implements the common pattern seen in drivers of a single iommu_group for the entire iommu driver instance. Implement this in core code so the drivers that want this can select it from their ops. Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/2-v1-c869a95191f2+5e8-iommu_single_grp_jgg@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de>