[Script/Service] - Passthrough Helper

[Ramalama]

Hi, i've camed in another thread to the Problem, that there is no easy way to bind vfio-pci to a bus device.
This is neccessary if you can't do it with vendor:device id, because you have multiple devices and you need them on your host too.
For example, if you want to passthrough one of four nic ports or you have 2 identical graphic cards, or sr-iov that you use on the host and you want to passthrough too.

Okay, you need 3 things:
1. /etc/systemd/system/vfio-helper.service

[Unit]
Description=Script to bind Devices on boot
Before=pve-guests.service

[Service]
Type=oneshot
EnvironmentFile=-/etc/vfio-helper.conf
ExecStart=/usr/bin/vfio-pci-bind.sh $BIND_DEVICES

[Install]
WantedBy=multi-user.target

2. /etc/vfio-helper.conf

# Modify first and uncomment the line below!
# The line below is just an example, you can bind devices based on BUS or vendor:devid
# You can add as many devices you want, space separated.
# Below are 2 lines as example, if you want to bind one or multiple devices!
#BIND_DEVICES="0000:23:00.0"
#BIND_DEVICES="0000:23:00.1 0000:06:00.0 10de:1b06 10de:10ef"

3. /usr/bin/vfio-pci-bind.sh

wget https://raw.githubusercontent.com/andre-richter/vfio-pci-bind/master/vfio-pci-bind.sh
mv vfio-pci-bind.sh /usr/bin/
chmod +x /usr/bin/vfio-pci-bind.sh

Credits goes to this guy: https://github.com/andre-richter/vfio-pci-bind

That script works without the need of a reboot, the service is just to not run it everytime if you reboot the host.
To confirm that it worked for example with 0000:23:00.1, you can simply check with:
lspci -vvs 0000:23:00.1 | grep driver
-> Kernel driver in use: vfio-pci
if there isn't vfio-pci, well it didn't worked xD


Just wanted to share, whoever needs this, here you go.

Cheers