I've been working on a patch series to get bhyve's NVMe emulation compliant with the v1.4 specification. The compliance tests now pass, and I will work on getting the patches up for review "soon". In the meantime, there is a copy of the full changes if anyone is interested in testing on current or 13-stable.
https://people.freebsd.org/~chuck/nvme-1.4/pci_nvme.c --chuck
