I need help about vfio using two identical GPUs

[GaduCouch]

Hey there beautiful people!

I've been trying to passthrough one of my GPU to install a KVM via vfio for a while now. I've followed some tutorials:

• https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
• https://www.youtube.com/watch?v=h7SG7ccjn-g&t=1233s (someordinarygamers tutorial)
• VFIO script and Permission Denied.

I figured out at some point that it is much much harder since I have two identical GPUs. I've managed to get everything in order up to the point where I regen my initramfs (mkinitcpio -p linux56) but when I reboot, it gives me the "sh /usr/bin/vfio-pci-override.sh Permission Denied" echo.

The thing is, I don't fully understand Haelikor's fix in VFIO script and Permission Denied. forum post. How do I append "pcie_acs_override=downstream,multifunction" to my boot? Also, will I have to manually shutdown the second iommu group at each boot?

I'd really like to keep both of those GPUs since the only other GPU I have would be a decent downgrade. I tried chmoding it with 777 to no avail. I have absolutely no problem starting from scratch again (already re-installed manjaro thrice XD what a noob am I right?) .

I'm using:

• Z170a PC Mate Mobo
• I3 7100 CPU
• 16 Gb @3200Mhz
• 2 GTX 1070
• Linux 56 Kernel
• Proprietary Drivers for the nvidia cards
• Manjaro 20.0 XFCE Desktop Environnement
• M.2 1Tb Drive

I would be happy to provide any information needed if I missed anything. Thanks a ton for the help, it would be very much appreciated. Thus said, have a nice one y'all!

[Kaventsmann]

There is a great forum that has built a user base with a lot of knowledge around this topic. My advice would be to ask there.

The VFIO and GPU Passthrough Beginner's Resource

[GaduCouch]

Thanks a ton @Kaventsmann!

I've been trying to get this to work for over 12h now . I will look at this right now! Will update the results later.

Have a nice one mate!

[GaduCouch]

Hey there people!

Just as a heads up for everyone. I gave up on trying to install qemu on KVM with two identical GPUs since I kinda wanted to use the PC. So I installed a lower-end GPU for linux (since my 1070 is being used to play games) and it only took me 1 hour to install the KVM this way (including the windows installation ).

So I'll maybe try again later on when I'll have more time on my hands. It is kind of a cheap solution ,but it works for now .

Have a nice one everybody and stay safe!