[justincormack]

From memory the original version of Intel Clear Containers had its own kvm based vmm but they moved back to qemu (or a more minimal patched version they maintain). They are working on containerd support so should be similar to Kata soon.

[Aissen]

That's what I thought, too, but re-reading the articles, they were using a patched kvmtool: https://lwn.net/Articles/644675/

So this is exactly what runv's lkvm backend is doing (except kvmtool isn't patched anymore). And Intel Clear Containers do not exist anymore(many broken links on clear linux's website subsist, though), since they moved to Kata as well:

https://01.org/blogs/2017/kata-containers-next-evolution-of-...