MultiOS support - FreeBSD panic under Xen 4.5.0

Is MultiOS supported under FreeBSD, because it’s failing to work in FreeBSD 9, 10 or 11 current, panicing the kernel. This is under Xen 4.5.0 using either xen-qemu-traditional or qemu-xen. Both using secondary passthrough.

This is either with a Quadro 2000 or FX3800, both with appropriate Quadro drivers. The same cards are fine under Linux (debian).