Hey there, I'm currently trying to do pretty much the same thing with a Radeon 7870 and macinabox starting from the same video and I had a couple of questions based on your post.
You mentioned that the GPU works well during install which was something that struck me as odd as so far I've been installing the os using the VNC gpu.
1. How did you modify the XML to add the cards?
I can't do what the video says, ie modify the settings and re-add the `qemu:commandline` part and fix the `br0`, the vm won't boot even if I just change the memory. I currently simply touch the xml and try to add the card like this.
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
</source>
<rom file='/mnt/disk1/isos/gpu-roms/Sapphire.HD7870.2048.decimal.rom'/>
<address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x02' slot='0x00' function='0x1'/>
</source>
<address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
</hostdev>
<memballoon model='none'/>
I'd be really interested to see your XML if you don't mind sharing (without the serial ofc).
2. You mentioned that you checked that the GPU is UEFI enabled, do you know if that is a requirement?
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If I manage to get any further will this will try to post any hints.
