Thanks! That leaves me thinking, though. I'm also using Unraid, and the main gpu is exclusively used for my vm passthrough (it's a Radeon). I thought that the bios won't free it once it has been claimed by the bios for passthrough, hence the Geforce GT710 for the bios. If I could free that, I could host another gaming setup.
- Use the knowledge gained from that to add an IOMMU group assigned to your GT710 to /boot/config/vfio-pci.cfg
- Reboot your Unraid server
- Do the normal gpu passthrough thing for the GT710 for a VM, but add the dumped vbios to the "Graphics ROM BIOS:" field in the VM "edit" gui
Hopefully it should work :D
One thing to keep in mind about the vfio-pci.cfg file is that it's effectively a blacklist, and if you do something that could change your IOMMU group assignments (such as adding or removing a PCI device) you could end up inadvertently blacklisting a PCI device you don't intend to. All you need to do is update the IOMMU groups in vfio-pci.cfg to fix it, but it can freak you out if you're not expecting it.
(For example if I remove one of my GPUs, one of my SATA controllers will inevitably end up getting the IOMMU group that _used_ to belong to a GPU, so it'll get blacklisted, and two of my array drives will appear missing until I update the vfio-pci.cfg to match the new IOMMU groups)
