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77785117f9
Wrap up the data pointer/num sanity and __iommu_copy_struct_from_user() call for iommu drivers to copy driver specific data at a specific location in the struct iommu_user_data_array. And expect it to be used in cache_invalidate_user ops for example. Link: https://lore.kernel.org/r/20240111041015.47920-4-yi.l.liu@intel.com Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Co-developed-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>