[Bug 1920752] Re: USB SoundCard Passthrough not working on arm64

[Gerd Hoffmann]

Can you record usb traffic (add pcap=<file> to usb-host)?

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Title:
  USB SoundCard Passthrough not working on arm64

Status in QEMU:
  New

Bug description:
  Hello,

  I am virtualizing a armhf guest on a aarch64 host and was to use my
  Sound Blaster USB Soundcard as passthrough.

  armhf Guest is: Debian Buster 
  aarch64 host is a jetson nano. KVM is enabled.

  Latest qemu is built from sources.
  The command I use for running is as follows:

  ../qemu/build/qemu-system-aarch64 -M virt -m 2048 -smp 2 -cpu 
host,aarch64=off -enable-kvm  \
  -kernel vmlinuz-4.19.0-14-armmp-lpae  -initrd initrd.img-4.19.0-14-armmp-lpae 
-append 'root=/dev/vda2' \
  -device nec-usb-xhci -device usb-kbd  -device usb-mouse -device 
usb-host,hostbus=1,hostport=2.3  -serial stdio  \
  -device virtio-gpu-pci,virgl=on,xres=1600,yres=900 -display sdl,gl=on \
  -drive if=none,file=hda2.qcow2,format=qcow2,id=hd   -device 
virtio-blk-device,drive=hd   \
  -netdev user,id=mynet   -device virtio-net-device,netdev=mynet \
  -bios edk2-arm-code.fd -no-reboot

  
  Where are my lsusb -t shows:

  rreddy78@jetson-nano:~/Downloads$ lsusb -t
  /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/4p, 5000M
      |__ Port 1: Dev 3, If 0, Class=Hub, Driver=hub/4p, 5000M
  /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/5p, 480M
      |__ Port 2: Dev 6, If 0, Class=Hub, Driver=hub/4p, 480M
          |__ Port 1: Dev 7, If 0, Class=Human Interface Device, Driver=usbhid, 
1.5M
          |__ Port 1: Dev 7, If 1, Class=Human Interface Device, Driver=usbhid, 
1.5M
          |__ Port 3: Dev 8, If 3, Class=Human Interface Device, Driver=usbhid, 
12M
          |__ Port 3: Dev 8, If 1, Class=Audio, Driver=snd-usb-audio, 12M
          |__ Port 3: Dev 8, If 2, Class=Audio, Driver=snd-usb-audio, 12M
          |__ Port 3: Dev 8, If 0, Class=Audio, Driver=snd-usb-audio, 12M
          |__ Port 4: Dev 9, If 0, Class=Human Interface Device, Driver=usbhid, 
1.5M

  Within the VM I can see the usb as follows

  rreddy78@debian:~$ lsusb -t
  /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
  /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
      |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M
      |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 480M

  
  Its looks like some passthrough as but it seems like only for

   _ Port 3: Dev 8, If 3, Class=Human Interface Device, Driver=usbhid,
  12M

  I am not sure if passthrough  even works because this post I saw

  https://community.arm.com/developer/ip-products/system/f/embedded-
  forum/48031/usb-pass-through-in-qemu-command-line-for-arm-
  machines/168764#168764

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