[SOLVED] GPU Passthrough (NVIDIA 1050ti) failed to get group 1


Renowned Member
Jul 10, 2013
Hi there,

i want to passthrough a NVIDIA 1050ti. If I follow the instructions in the Proxmox Wiki using the OVMF Bios I get the following error when I start the VM (Windows 10): "failed to get group 1"

kvm: -device vfio-pci,host=01:00.0,id=hostpci0.0,bus=pci.0,addr=0x10.0,multifunction=on: vfio: error opening /dev/vfio/1: Device or resource busy
kvm: -device vfio-pci,host=01:00.0,id=hostpci0.0,bus=pci.0,addr=0x10.0,multifunction=on: vfio: failed to get group 1
kvm: -device vfio-pci,host=01:00.0,id=hostpci0.0,bus=pci.0,addr=0x10.0,multifunction=on: Device initialization failed

Should I re-activate the "pcie_acs_override=downstream" - Patch in the grub? Or is there any other problem causing this error?

fyI: I am passing a SAS-Controller through to another vm without any problems....

My VM-Config

bios: ovmf
bootdisk: scsi0
cores: 2
cpu: Haswell-noTSX
hostpci0: 01:00;01:00.1,x-vga=on
ide2: share1:iso/de_windows_10_multiple_editions_x64_dvd_6846954.iso,media=cdrom
ide3: share1:iso/virtio-win-0.1.118.iso,media=cdrom,size=55632K
memory: 8192
name: win10steamserver
net0: virtio=EA:4E:94:25:3D:BA,bridge=vmbr1
numa: 0
ostype: win8
scsi0: vm2:104/vm-104-disk-1.raw,backup=0,size=50G
scsi1: /dev/disk/by-id/ata-TOSHIBA_THNSNJ256GCSU_Y45S10CPTB4W,size=250059096K
scsihw: virtio-scsi-pci
smbios1: uuid=af5ed421-08f1-4ebd-81a4-4e595f7149f8
sockets: 1

Last edited:
Well... My CPU is the XEON 1230v3.... and there are iommu grouping issues with it... like it mentioned in the Proxmox Wiki :D

I re-activated the "pcie_acs_override=downstream"-patch and I don`t receive any errors :D


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