If a different code is found at that address, it will not bind. In this example, the updated script will bind the device at pci address 0000:03:00.0, but only if the code is 8086:1533. When you click to bind a device on the System Devices page, it will write both the and the code to the config file, like this:

If a device is being used by Unraid (such as a USB controller, disk controller, etc) then the web interface will prevent you from selecting it.Īdditionally, we have a new version of the underlying vfio-pci script which can prevent the wrong devices from being bound when hardware is added or removed. Rather than editing the config file by hand, simply add a checkbox next to the devices that you want to bind to vfio-pci (aka hide from Unraid). So now from the Tools -> System Devices page you can easily see all of your hardware and which IOMMU groups they are in. We still had the problem where if you add/remove hardware after modifying the file, the pci addresses could change and the wrong device could end up being bound to vfio-pciįor Unraid 6.9, Skittals has incorporated the excellent 'VFIO-PCI Config' plugin directly into the Unraid webgui. But at least if anything went wrong you could simply delete the config file off the flash drive and reboot. It was a fairly technical process to find the right string to place in the file. This worked, but still had several downsides: You needed to manually modify the config/vfio-pci.cfg file and specify the string, like this:

Starting with Unraid 6.7 we could bind devices to the vfio-pci driver based on the string (aka pci address). This would cause problems if a critical disk controller or NIC were suddenly hidden from Unraid If you add/remove hardware after modifying syslinux, the pci address could change and the wrong device could end up being stubbed. Make a mistake and your system won't boot!Īs an alternative, you could add the string to the xen-pciback.hide parameter in Syslinux: It is a fairly technical process to find the right Vendor:Device code and modify the syslinux file. If you have multiple devices with the same Vendor:Device code, all of them would be stubbed (hidden) from Unraid In the past (pre Unraid 6.7) we would stub the device by adding a Vendor:Device code to the vfio-pci.ids parameter in Syslinux, something like this: TL DR - skip to the second post if you just want to know how to convert from legacy PCI stubbing via Syslinux to the new point and click method in Unraid 6.9Īt times you will want to 'hide' devices from Unraid so that they can be passed through to a VM.

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