I would like to install a single graphics card into a host and share it out between multiple VM's. Here are some articles on how it can be done in gentoo/qemu but I'm not a guru so I'm not sure if this is possible in Foss.
https://events.linuxfoundation.org/sites/events/files/slides/KVMGT-a%20Full%20GPU%20Virtualization%20Solution_1.pdf