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Add eventfd for the vdpa callback so that user can signal it directly instead of triggering the callback. It will be used for vhost-vdpa case. Signed-off-by: Xie Yongji <xieyongji@bytedance.com> Message-Id: <20230323053043.35-9-xieyongji@bytedance.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>