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Sometimes users need to be aware when a vfio_group attaches to a KVM or detaches from it. KVM already calls get/put method from vfio to manipulate the vfio_group reference, it can notify vfio_group in a similar way. Cc: Kirti Wankhede <kwankhede@nvidia.com> Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Jike Song <jike.song@intel.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>