Regarding 3.) How to passthrough host primary GPU (if possible, :) )
I've stuggled with that issue myself a lot until I gave up and ended up switching my guest GPU to a secondary slot. I'm still not even sure what counts as "host primary", is it the boot_vga? from https://www.redhat.com/archives/vfio-users/2016-May/msg00094.html, In my setup, my primary GPU is passed to a VM and my 'secondary' GPU is used for the host. I use pci-stub to capture my primary GPU, and Xorg is given to my secondary GPU through the use of BusID in xorg.conf. My primary GPU is AMD (r9 390), and my secondary (host) GPU is nVidia (GT 730), running proprietary drivers. I am able to provide more details on this matter, if preferred.
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