Alex Williamson has an excellent VFIO blog that discusses the basics of GPU passthru. [0]

I think the instructions are meant for Debian however and there are some differences in the commands you need to run. If you use a Redhat distro and/or you want some further optimization tips I'm also happy to work you through the process.

https://vfio.blogspot.com/2015/05/vfio-gpu-how-to-series-par...