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This introduces a new version of virtio-blk device. The default virtio-blk provides synchronous processing of the queues, while this new version relies on io_uring from the host kernel to provide an asynchronous processing of the queues. This new asynchronous version provides a huge performance improvement compared to the default synchronous version. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>