Proxmox GPU Passthrough crashes VMs

[ajb3932]

Hi All,

Firstly, I'm sorry it has had to come to this, I have spent days trying to fix this myself following every guide possible.
I just need a sanity check over my config files incase I am missing something obvious.

I think that I have IOMMU enabled correctly but when I pass it through to my Windows 11 VM is bluescreens after 2 minutes.

Specs:
HP Z640
Intel E5-2660
Nvidia GTX 1080Ti

BIOS Settings:
Intel VT-d enabled.
ACS enabled

root@pve:/# nano /etc/modprobe.d/passthrough.conf

blacklist nvidia
blacklist radeon
blacklist nouveau
blacklist nvidiafb

options kvm ignore_msrs=1
options vfio_iommu_type1 allow_unsafe_interrupts=1
options kvm-intel nested=N
options vfio-pci ids=10de:1b06,10de:10ef disable_vga=1

root@pve:/# nano /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt video=vesafb:off video=efifb:off"

/sys/kernel/iommu_groups/*/devices/*

IOMMU group 89 02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP102 [GeForce GTX 1080 Ti] [10de:1b06] (rev a1)
        Kernel modules: nvidiafb, nouveau
IOMMU group 89 02:00.1 Audio device [0403]: NVIDIA Corporation GP102 HDMI Audio Controller [10de:10ef] (rev a1)

root@pve:/# cat /etc/modules

vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

I find it strange that the kernel modules have been loaded despite me blacklisting the drivers. (Am I barking up the wrong tree?)

I have done update-grub and update-initramfs -u -k all after changing things.

Any help would be appreciated,

 

[leesteken]

What is the output of cat /proc/cmdline? I don't know where you got the video=vesafb:off video=efifb:of but they don't do anything anymore with current Proxmox/kernel versions. Make sure to use this work-around from this thread when doing PCIe passthrough of the boot GPU.

 

[ajb3932]

Thanks for the heads up, my cmdline looks like this now:

root@pve:~# cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-5.15.102-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on iommu=pt initcall_blacklist=sysfb_init

It now doesnt crash with the PCI device attached.



But the GPU doesnt show up at all in my VM.