On Wed, Mar 30, 2022 at 09:35:52PM +0800, Yi Liu wrote: > > +/** > > + * struct iommu_ioas_copy - ioctl(IOMMU_IOAS_COPY) > > + * @size: sizeof(struct iommu_ioas_copy) > > + * @flags: Combination of enum iommufd_ioas_map_flags > > + * @dst_ioas_id: IOAS ID to change the mapping of > > + * @src_ioas_id: IOAS ID to copy from > > so the dst and src ioas_id are allocated via the same iommufd. > right? just out of curious, do you think it is possible that > the srs/dst ioas_ids are from different iommufds? In that case > may need to add src/dst iommufd. It's not needed today, just to > see if any blocker in kernel to support such copy. :-) Yes, all IDs in all ioctls are within the scope of a single iommufd. There should be no reason for a single application to open multiple iommufds. Jason
