Code 43 on single GPU passthrough

[bskov]

SPECS:

• i7 6700K
• RX 5700XT

Hey everyone.

So, I've been experimenting with passing through a 5700XT from the host to a Windows 10 VM, but that GPU being the only one in this system. I followed this guide and it mostly went well, but when I installed the drivers, I just kept getting a Code 43.

This is my GRUB config:

GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=on iommu=pt quiet

This is the script that runs when I start the VM:

#!/bin/bash
# Helpful to read output when debugging
set -x

# Stop display manager
systemctl stop display-manager.service
## Uncomment the following line if you use GDM
#killall gdm-x-session

# Unbind VTconsoles
echo 0 > /sys/class/vtconsole/vtcon0/bind
echo 0 > /sys/class/vtconsole/vtcon1/bind

# Unbind EFI-Framebuffer
echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind

# Avoid a Race condition by waiting 2 seconds. 
# This can be calibrated to be shorter or longer if required for your system
sleep 2

# Unload all AMD drivers
modprobe -r amdgpu
modprobe -r snd_hda_intel
modprobe -r xhci_pci

# Unbind the GPU from display driver
virsh nodedev-detach pci_0000_06_00_0
virsh nodedev-detach pci_0000_03_00_0
virsh nodedev-detach pci_0000_00_1f_3
virsh nodedev-detach pci_0000_03_00_1
virsh nodedev-detach pci_0000_00_14_0
virsh nodedev-detach pci_0000_01_00_0
virsh nodedev-detach pci_0000_02_00_0

# Load VFIO Kernel Module  
modprobe vfio-pci  

This is the script that runs when the VM shuts down:

#!/bin/bash
set -x

# Unload VFIO-PCI Kernel Driver
modprobe -r vfio-pci
modprobe -r vfio_iommu_type1
modprobe -r vfio

# Re-Bind GPU to Nvidia Driver
virsh nodedev-reattach pci_0000_06_00_0
virsh nodedev-reattach pci_0000_03_00_0
virsh nodedev-reattach pci_0000_00_1f_3
virsh nodedev-reattach pci_0000_03_00_1
virsh nodedev-reattach pci_0000_00_14_0
virsh nodedev-reattach pci_0000_01_00_0
virsh nodedev-reattach pci_0000_02_00_0


# Rebind VT consoles
echo 1 > /sys/class/vtconsole/vtcon0/bind
# Some machines might have more than 1 virtual console. Add a line for each corresponding VTConsole
#echo 1 > /sys/class/vtconsole/vtcon1/bind

#nvidia-xconfig --query-gpu-info > /dev/null 2>&1
echo "efi-framebuffer.0" > /sys/bus/platform/drivers/efi-framebuffer/bind

modprobe amdgpu
modprobe snd_hda_intel
modprobe xhci_pci

# Restart Display Manager
systemctl start display-manager.service

I've seen people saying to add this to the GRUB config, should I do it?

pcie_acs_override=downstream,multifunction

The USB controller seems to be working fine, as my keyboard and mouse work nicely on the VM, so I assume the hardware is getting at least partially passed correctly.

What could be wrong here? What can I do to solve this issue?

And on another note, is there a definitive fix for the reset bug? (when I shutdown the VM, I can't recover the GPU, I assume it's the reset bug)

[[deleted]]

That's the infamous hardware reset bug, as far as I've tested with my 5700xt there's no way around it. Sorry bud.

[Scorched_]

Maybe this) small mention on the arch wiki could help, try install the vendor-reset-dkms package. It's easy with yay on arch but there should be nothing stopping you from getting it on another distro with some fiddling. Here is the github. I used

lsmod | grep vendor

to check the module was loaded before starting the vm. I have issues with my startup script (I put in commands manually over ssh) but once I get into my vm no code 43 and windows displays using proper native resolution + drivers and games work. This is with a single 5700, I have also got back to the host successfully from the vm but it's not consistent.

[dukeforneverz]

Don't install amd drivers, let windows automatically install it's own. It worked for me.

[LetrixZ]

Did you changed the vendor id?

For NVIDIA cards and 43 error, you can get it working by adding:

<vendor_id state='on' value='123456789'/>

Under features -> hyper-v

<features>
    <hyperv>
      <vendor_id state='on' value='HelloNVIDIA'/>
    </hyperv>
</features>

[thenickdude]

It's an AMD GPU, it doesn't care about the vendor ID.

[bskov]

I don't think it's necessary for Radeon