Nvidia GPU Passthrough with vbios - No Display with VM's (System Log and Diagnostics Attached!)

[Tomway]

Hey hows it going, my name is Tom. I've recently started using Unraid because it is the best solution out there for running a Media Server, File Storage and Virtual Machines.

 

I've tried all kinds of fixes and watched every video SpaceInvaderOne has made about Nvidia GPU passthrough, vbios dumping and I've still got no display output. I was using legacy boot which was working okay for Unraid but the graphics on the GUI mode was a bit out of whack, so i started using UEFI boot and that sorted out the graphics on the GUI Mode and normal boot mode. Just still no GPU Passthrough with VM's.

 

What's strange is that Unraid can boot into GUI Mode just fine using the GPU in slot 1, but won't passthrough on a Windows 10 or any other type of VM.

 

When starting up a VM (Win10 in this case) bellow is the error im getting on the log. (Screenshot also attached)

 

This is the error code in the log (Log Screenshot Attached)

2021-04-05T18:23:12.073130Z qemu-system-x86_64: vfio_region_write(0000:2b:00.0:region3+0x111d780, 0xccff0000ccff,8) failed: Device or resource busy

2021-04-05T18:23:12.074649Z qemu-system-x86_64: vfio_region_write(0000:2b:00.0:region3+0x1121708, 0x0,8) failed: Device or resource busy

 

Unraid 6.9.1

Motherboard: MSI Tomahawk b550 (MS-7c91) Version 2.

CPU: AMD Ryzen 5600x 6-core. (No On-Board Graphics)

GPU: Nvidia GeForce GTX 650 ti. (Slot 1)

RAM: 16gb DDR4 3200mhz.

Latest Bios Installed!

 

I've tried both types of vbios (Hex editing and Script in unraid)

All IOMMU Groups passed through successfully and i can boot into GUI Mode! 

IOMMU groups enabled in bios as well as VM's

 

DIagnostics and SYS Log Uploaded!

 

I just need it to work temporarily until i can get hold of a RTX 3080 at a non extortionate rate.

scarif-diagnostics-20210405-2053.zip scarif-syslog-20210405-1948.zip

Edited April 5, 2021 by Tomway

[Lucict]

I am having this issue as well. I'm not quite sure what the problem is. My Windows 10 VM has been working fine for months, but I guess it didn't like the 6.9.2 upgrade or something. 

[Lucict]

Found a fix:

 

echo 0 > /sys/class/vtconsole/vtcon0/bind
echo 0 > /sys/class/vtconsole/vtcon1/bind
echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind

 

Apparently when the system boots, something is getting attached to the GPU memory. These commands clear that off....I think. I don't really know. 

 

Here are some links for additional reading:

https://techblog.jeppson.org/2019/10/primary-vga-passthrough-in-proxmox/

https://listman.redhat.com/archives/vfio-users/2016-March/msg00088.html

 

There's a lot more out there as well.