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This patch implements the vq notification mapping support for vhost-vDPA. This is simply done by using mmap()/munmap() for the vhost-vDPA fd during device start/stop. For the device without notification mapping support, we fall back to eventfd based notification gracefully. Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com> Signed-off-by: Jason Wang <jasowang@redhat.com>