vfio: vfio_register_notifier: classify iommu notifier
Currently vfio_register_notifier assumes that there is only one notifier chain, which is in vfio_iommu. However, the user might also be interested in events other than vfio_iommu, for example, vfio_group. Refactor vfio_{un}register_notifier implementation to make it feasible. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Reviewed-by:Kirti Wankhede <kwankhede@nvidia.com> Signed-off-by:
Jike Song <jike.song@intel.com> [aw: merge with commit 816ca69ea9c7 ("vfio: Fix handling of error returned by 'vfio_group_get_from_dev()'"), remove typedef] Signed-off-by:
Alex Williamson <alex.williamson@redhat.com>
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