It seems to boot and run fine on my bhyve VM, which I verified passes through
the cpuid bit. I don't know any particular tests to stress the path.
i386 kernel builds ok in tinderbox; I did not test it.
Prompted by Anton; some earlier discussion from 2017: https://lists.freebsd.org/pipermail/freebsd-amd64/2017-August/019026.html