bhyve Inside a Jail: The FreeBSD Feature Nobody Uses

A jail shares the host kernel, so sooner or later you need a real virtual machine. bhyve has been able to run inside a jail since FreeBSD 12.0, and almost nobody does it. This is the full build from my production hypervisor: the devfs ruleset, the four things that have to line up, the two-tier bridge topology, and an honest account of what allow.vmm does and does not buy you.