Passing physical serial port through to bhyve

Background:  I am starting work on my PhD thesis in theoretical CS and
one of the things I need to do is prove both theoretically and
experimentally that a single (dataflowed) NAND is Turing complete (and
maps directly onto a lambda machine) and can do useful work (a
non-dataflowed one is theoretically Turing complete but can't be used
for anything useful [theorem in thesis]).   In order to show this I
want to set up a breadboard with a single NAND on it with LED's on
both inputs and both outputs and then using the serial port of my
desktop send longer inputs and receive longer outputs then one bit.

Due to the nature of the project I want to do all the development and
testing from a bhyve VM (already setup) thus I need to find a way have
that VM drive the actual physical serial port so as to conduct various
experiments to prove the above.

-- 
Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org