RTX 5080 VFIO passthrough fails on Proxmox VE 9.1 with error getting device from group 13: No such device

[temir_ast]

Hello,


I am trying to pass through an NVIDIA RTX 5080 (GB203) to a VM on Proxmox VE 9.1, but the VM fails to start. I would appreciate any advice from anyone who has seen something similar.

Environment​

• Host: Proxmox VE 9.1
• [B]Tested kernels:[/B] 6.17.13-2-pve and 6.14.11-6-pve
• [B]CPU:[/B] Intel with VT-d enabled
• [B]Kernel parameters:[/B] intel_iommu=on iommu=pt
• [B]GPU:[/B] Palit GeForce RTX 5080
  • VGA: 10de:2c02
  • Audio: 10de:22e9

IOMMU group​

The GPU is in IOMMU group 13, and the group contains only these two devices:

• 0000:02:00.0 VGA compatible controller
• 0000:02:00.1 Audio device

Both functions are bound to vfio-pci.


lspci -nnk -s 02:00 shows:



[CODE]02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GB203 [GeForce RTX 5080] [10de:2c02] (rev a1)
Subsystem: Palit Microsystems Inc. Device [1569:f322]
Kernel driver in use: vfio-pci
Kernel modules: nvidiafb, nouveau[/CODE]

02:00.1 Audio device [0403]: NVIDIA Corporation Device [10de:22e9] (rev a1)
        Subsystem: NVIDIA Corporation Device [10de:0000]
        Kernel driver in use: vfio-pci
        Kernel modules: snd_hda_intel

VM configuration​

I tested the VM with OVMF and q35. Current config:

agent: 1
bios: ovmf
machine: q35
cpu: host
cores: 4
sockets: 1
memory: 8192
hostpci0: 0000:02:00,pcie=1
vga: std
boot: order=virtio0;net0

I also tested:

• hostpci0: 0000:02:00,pcie=1,x-vga=1 with vga: none
• separate function passthrough
• adding an EFI disk
• removing PCI mapping and using direct PCI address only

Error​

Every time I start the VM, I get:

error writing '1' to '/sys/bus/pci/devices/0000:02:00.0/reset': Inappropriate ioctl for device
failed to reset PCI device '0000:02:00.0', but trying to continue as not all devices need a reset
kvm: -device vfio-pci,host=0000:02:00.0,id=hostpci0.0,bus=ich9-pcie-port-1,addr=0x0.0,multifunction=on: vfio 0000:02:00.0: error getting device from group 13: No such device
Verify all devices in group 13 are bound to vfio-<bus> or pci-stub and not already in use
start failed: QEMU exited with code 1

What I already checked​

• IOMMU group is clean and contains only the GPU and its audio function
• both functions are bound to vfio-pci
• tested on both 6.17.13-2-pve and 6.14.11-6-pve
• tested with and without x-vga=1
• tested with vga: none and vga: std
• added efidisk0
• blacklisted host GPU-related modules where applicable

Additional information​

On the host:




CONFIG_VFIO_DEVICE_CDEV=y



Loaded modules:




vfio_pci 16384 0
vfio_pci_core 86016 1 vfio_pci
irqbypass 12288 2 vfio_pci_core,kvm
vfio_iommu_type1 49152 0
vfio 65536 4 vfio_pci_core,vfio_iommu_type1,vfio_pci
iommufd 110592 1 vfio



/dev/vfio/13 exists, but lsof /dev/vfio/13 shows nothing.


This makes me wonder whether this is related to:

• RTX 5080 / Blackwell support
• iommufd vs legacy VFIO group handling
• motherboard BIOS / firmware behavior
• DMA protection / kernel DMA protection settings in BIOS

Questions​

Has anyone successfully passed through an RTX 5080 on Proxmox VE 9.x?


Does this look like a known iommufd / VFIO issue rather than a normal passthrough misconfiguration?


Would you recommend checking BIOS options such as:

• VT-d / IOMMU = Enabled
• Kernel DMA Protection = Disabled
• Pre-boot DMA Protection
• BIOS update to latest version

Any help or suggestions would be greatly appreciated.


Thanks.