Trying to recreate this, I have a xhci Host controller (no extra card, but as part of the chipset). 00:14.0 USB controller: Intel Corporation C610/X99 series chipset USB xHCI Host Controller (rev 05)
00:14.0 USB controller: Intel Corporation C610/X99 series chipset USB xHCI Host Controller (rev 05) (prog-if 30 [XHCI]) Subsystem: Hewlett-Packard Company C610/X99 series chipset USB xHCI Host Controller Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin D routed to IRQ 19 NUMA node: 0 Region 0: Memory at 39ffff00000 (64-bit, non-prefetchable) [size=64K] Capabilities: <access denied> Kernel driver in use: xhci_hcd First check if it can be unbound: echo 0000:00:14.0 | sudo tee /sys/bus/pci/devices/0000:00:14.0/driver/unbind Works and I see: [2071597.213764] xhci_hcd 0000:00:14.0: remove, state 4 [2071597.213778] usb usb5: USB disconnect, device number 1 [2071597.215019] xhci_hcd 0000:00:14.0: USB bus 5 deregistered [2071597.215036] xhci_hcd 0000:00:14.0: remove, state 4 [2071597.215046] usb usb4: USB disconnect, device number 1 [2071597.215049] usb 4-3: USB disconnect, device number 2 [2071597.218160] xhci_hcd 0000:00:14.0: USB bus 4 deregistered FYI: Libvirt should do the unbind/bind for you at runtime if you configured it as managed hostdev Check ID $ lspci -n -s 00:14.0 00:14.0 0c03: 8086:8d31 (rev 05) Tell vfio-pci to handle that $ echo 8086 8d31 | sudo tee /sys/bus/pci/drivers/vfio-pci/new_id I get a fail to bind it like: vfio-pci: probe of 0000:00:14.0 failed with error But then on this system I always failed to get vfio working due to FW issues (not a Linux issue). You might try the above but for your device to initially rule out all of the modprobe/boot timing that might affect it. After boot just try to: 1. unbind your device from xhci 2. make the ID known to vfio-pci (that should autoload it then) Report back the kernel you have and the success or fail when doing so, along a dmesg log of the try. That should clarify if we look at vfio-pci no more being able to load at all (above test fails) or just at how to prep cour config correctly so that it works again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781891 Title: PCI USB card passthrough does not work any more To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781891/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs