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iommu/iommufd: Add IOMMU_[UN]MAP_DMA on IOASID
[HACK. will fix in v2] This patch introduces vfio type1v2-equivalent interface to userspace. Due to aforementioned hack, iommufd currently calls exported vfio symbols to handle map/unmap requests from the user. Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
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