I suppose work like this is demonstrating that, contrary to what e.g. the creators of Docker say, a virtual machine image is not too heavyweight to be our industry's equivalent of a shipping container. What is too heavyweight is a VM image of a conventional operating system distribution with all of the baggage that it brings.

Would these fine-grained unikernels also run well on KVM, VMware ESXi, Hyper-V, or bhyve (FreeBSD's new VMM)? Or is Xen uniquely suited to this kind of thing?