[vfio-users] Usb sound card passtrough - fail

[Alex Williamson]

On Wed, 2015-09-16 at 20:04 +0200, Mateusz Górczak wrote:
> Hello,
> 
> I have been trying to passtrough my usb sound card (Creative Sound Blaster
> X-Fi Pro USB). My host is arch linux and my guest - win 8.1. I use qemu-kvm
> with ovmf.
> 
> Windows recognize my sound card and works perfectly, but after a while
> (about 30 second of playing music), a lot of noises are occured. I also
> install windows 10 (just for compare) the problem are exactly the same. I
> also trying run ubuntu as a guest, but after passtrough my sound card *all
> usb devices turn off *- even the ones, which are not passtrough to guest
> (without passing sound card, ubuntu works perfectly).
> 
> On my host (arch) card works great, so there are no problem with the card
> itself (I believe...; also on 'native' Windows there is no problem with the
> card).
> 
> Any advice? Qemu doesn't print anything useful.
> If you need more information - just ask.
> 
> my config (minimal - only mouse, keyboard and sound card are passtrough to
> guest):
> 
> qemu-system-x86_64 -enable-kvm -m 5G -cpu host,kvm=off \
> -smp 4,sockets=1,cores=4,threads=2 \
> -drive
> if=pflash,format=raw,readonly,file=/usr/share/edk2.git/ovmf-x64/OVMF-pure-efi.fd
> \
> -drive
> if=pflash,format=raw,file=/usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd
> \
> -device virtio-scsi-pci,id=scsi \
> -drive file=Downloads/virtio-win-0.1.96.iso,id=virtiocd,if=none -device
> ide-cd,bus=ide.1,drive=virtiocd \
> -drive file=ubuntu15.iso,id=isocd,if=none -device scsi-cd,drive=isocd \
> -vga none \
> -drive file=windowsUefi.img,id=disk,format=raw,if=none -device
> scsi-hd,drive=disk \
> -device vfio-pci,host=01:00.0 \
> -device vfio-pci,host=01:00.1 \
> -usb -usbdevice host:09da:1343 \
> -usb -usbdevice host:041e:3237 \
> -usb -usbdevice host:046d:c52b

We're pretty lax on discussions for this list, but issues concerning
-usbdevice are really better directed to qemu-discuss.  They have
nothing to do with vfio.  If you were assigning the PCI USB controller
or a native PCI audio device, feel free to discuss it here.  Thanks.