When upgrading one of our ppc64el system (Talos II) from 5.18 to 5.19, we found that vfio-pci can no longer bind to the installed USB controller. This issue persists into at least kernel 6.0. The procedure to bind is as follows: echo "104c 8241" > /sys/bus/pci/drivers/vfio-pci/new_id echo 0003:01:00.0 > /sys/bus/pci/devices/0003\:01\:00.0/driver/unbind echo 0003:01:00.0 > /sys/bus/pci/drivers/vfio-pci/bind echo "104c 8241" > /sys/bus/pci/drivers/vfio-pci/remove_id The result is: [ 220.792855] VFIO - User Level meta-driver version: 0.3 [ 221.280523] xhci_hcd 0003:01:00.0: remove, state 4 [ 221.280554] usb usb2: USB disconnect, device number 1 [ 221.281115] xhci_hcd 0003:01:00.0: USB bus 2 deregistered [ 221.281134] xhci_hcd 0003:01:00.0: remove, state 1 [ 221.281144] usb usb1: USB disconnect, device number 1 [ 221.281148] usb 1-1: USB disconnect, device number 2 [ 221.285611] usb 1-2: USB disconnect, device number 3 [ 221.286197] usb 1-3: USB disconnect, device number 4 [ 221.286203] usb 1-3.1: USB disconnect, device number 6 [ 221.629920] usb 1-4: USB disconnect, device number 5 [ 221.639087] xhci_hcd 0003:01:00.0: USB bus 1 deregistered [ 221.639343] vfio-pci: probe of 0003:01:00.0 failed with error -22 IOMMU groups are showing up correctly, the IOMMU is active and the only change was the kernel. Falling back to 5.15.85 reactivates the support. Is this a known problem? Anything I can try to do to track it down? Thanks!
