[vfio-users] [PATCH] Passthough of one GPU with a PC with 2 identical GPUs installed

[James]

Hi,

Please find attached a kernel patch. This is based from a very old patch 
that never made it into the kernel in 2014. 
https://lkml.org/lkml/2014/10/20/295. I am not sure who else I should be 
adding to the Signed-off-by section.

I have modified it and tested it, so that it works against kernel 5.1.10.

Summary below:


    PCI: Introduce new device binding path using pci_dev.driver_override

     In order to bind PCI slots to specific drivers use:
pci=driver[xxxx:xx:xx.x]=foo,driver[xxxx:xx:xx.x]=bar,...

     The main use case for this is in relation to qemu passthrough
     of a pci device using IOMMU and vfio-pci.
     Example:
     The host has two identical devices. E.g. 2 AMD Vega GPUs,
     The user wishes to passthrough only one GPU.
     This new feature allows the user to select which GPU to passthrough.

     Signed-off-by: James Courtier-Dutton <James at superbug.co.uk>




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