vfio: Refactor dma APIs for emulated devices
To use group helpers instead of opening group related code in the API. This prepares moving group specific code out of vfio_main.c. Link: https://lore.kernel.org/r/20221201145535.589687-10-yi.l.liu@intel.comReviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Tested-by: Lixiao Yang <lixiao.yang@intel.com> Tested-by: Yu He <yu.he@intel.com> Signed-off-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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