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Assuming vhost-user devices support CONFIGURE_MEM_SLOTS protocol feature, we introduce a new method to the VirtioDevice trait in order to update one single memory at a time. In case CONFIGURE_MEM_SLOTS is not supported by the backend (feature not acked), we fallback onto the current way of updating the memory mappings, that is with SET_MEM_TABLE. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>