NVMM is a full type-2 hypervisor solution for NetBSD on several architectures, Ironclad implements it as a cleaner, more lightweight version of something like Linux’s KVM. DragonFlyBSD hosts guides on using it here.
NVMM usually gets exposed in the way of a library, like libnvmm,
Ironclad only provides the building blocks of said library in the form of
syscalls.