[Qemu-devel] [Bug 1505759] Re: Usb passthrough of devices plugged to AMD FCH USB OHCI Controller failing on q35.

[José Ramón Muñoz Pekkarinen]

Finally, I tried several combination of ports for this, until I figure
out and arrangement that worked for me. Seems like the problem is that 2
hp usb devices cannot share the same bus, so no matter if it's using an
ohci controller, an ehci, controller, or even xhci, if the devices are
in the same bus, some fancy error will come to the screen, and no
keyboard and mouse turns up in the vm.

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Title:
  Usb passthrough of devices plugged to AMD FCH USB OHCI Controller
  failing on q35.

Status in QEMU:
  New

Bug description:
  I'm trying to setup a q35 vm with windows 7 guest for vga passthrough.
  The machine works well for this purpose, but the usb devices passed to
  the vm does not. I receive the following errors on screen:

  qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE]
  libusb: error [_open_sysfs_attr} open 
  /sys/bus/usb/devices/3-5/bConfigurationValue failed ret=-1 errno=2
  qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE]
  libusb: error [_open_sysfs_attr} open 
  /sys/bus/usb/devices/4-1/bConfigurationValue failed ret=-1 errno=2
  Disabling IRQ #18
  Disabling IRQ #17

  And from the system log I can see the following:

  Oct 13 20:13:25 koalita kernel: vfio-pci 0000:01:00.1: enabling device (0400 
-> 0402)
  Oct 13 20:13:29 koalita kernel: usb 3-5: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:30 koalita kernel: usb 4-1: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:30 koalita kernel: usb 10-2: reset low-speed USB device number 2 
using xhci_hcd
  Oct 13 20:13:31 koalita kernel: usb 10-2: ep 0x81 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:31 koalita kernel: usb 10-2: ep 0x1 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:31 koalita kernel: usb 3-5: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:31 koalita kernel: usb 10-2: reset low-speed USB device number 2 
using xhci_hcd
  Oct 13 20:13:32 koalita kernel: usb 10-2: ep 0x81 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:32 koalita kernel: usb 10-2: ep 0x1 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:32 koalita kernel: usb 4-1: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:33 koalita kernel: usb 3-5: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:33 koalita kernel: usb 4-1: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:34 koalita kernel: usb 3-5: reset low-speed USB device number 2 
using ohci-pci
  Oct 13 20:13:34 koalita kernel: usb 10-2: reset low-speed USB device number 2 
using xhci_hcd
  Oct 13 20:13:35 koalita kernel: usb 10-2: ep 0x81 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:35 koalita kernel: usb 10-2: ep 0x1 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:35 koalita kernel: usb 10-2: reset low-speed USB device number 2 
using xhci_hcd
  Oct 13 20:13:35 koalita kernel: usb 10-2: ep 0x81 - rounding interval to 64 
microframes, ep desc says 80 microframes
  Oct 13 20:13:35 koalita kernel: usb 10-2: ep 0x1 - rounding interval to 64 
microframes, ep desc says 80 microframes

  I tried to any combination of usb devices, and even disabling the ICH9
  usb devices to make the setup looks close to the 440fx machine that is
  working for me.

  Version of qemu is 2.2.1(all newer versions fails on usb passthrough,
  even in 440fx machines), and kernel is 4.1.8.

  The script to launch it is the following:

  qemu-system-x86_64 -enable-kvm -M q35 -vga none -cpu host -smp 
3,cores=3,threads=1 -m 6144 \
          -L /usr/x86_64-pc-linux-gnu/usr/share/qemu \
          -nodefaults -nodefconfig \
          -device ioh3420,multifunction=on,id=pcie \
          -device 
vfio-pci,host=01:00.0,addr=1c.0,x-vga=on,multifunction=on,bus=pcie \
          -device vfio-pci,host=01:00.1,addr=1c.1,bus=pcie \
          -netdev user,id=user.0 -device virtio-net-pci,netdev=user.0 \
          -device usb-ehci,id=ehci -device nec-usb-xhci,id=xhci \
          -usb -usbdevice host:03f0:134a -usbdevice host:03f0:0024 -usbdevice 
host:0079:0006 \
          -drive file=q35_win7.img,format=raw,cache=none,aio=native,if=virtio

  Thanks!

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