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Extend IOMMU_HWPT_ALLOC to allocate domains to be used as parent (stage-2) in nested translation. Add IOMMU_HWPT_ALLOC_NEST_PARENT to the uAPI. Link: https://lore.kernel.org/r/20230928071528.26258-5-yi.l.liu@intel.com Signed-off-by: Yi Liu <yi.l.liu@intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>