[vfio-users] PCIe Sound Card VFIO Pass through Sounds Terrible (link to audio file)

[sL1pKn07 SpinFlo]

why not use the sound card through pulseaudio?

(damn you , ML/gmail)

2016-09-30 13:00 GMT+02:00 Jonathan Scruggs <j.scruggs at gmail.com>:
> Hi all,
>
> I have a PCIe sound card that I wish to pass through to a Windows 10 guest
> using VFIO, but it sounds terrible.
>
> Kernel: Linux Beast 4.7.5-gentoo #5 SMP PREEMPT Thu Sep 29 11:26:39 BST 2016
> x86_64 Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz GenuineIntel GNU/Linux
>
> Qemu version: app-emulation/qemu-2.7.0-r4::gentoo
>
> Libvirt version: app-emulation/libvirt-2.2.0
>
> The sound card is:
> 09:00.0 Audio device: Creative Labs Sound Core3D [Sound Blaster Recon3D /
> Z-Series] (rev 01)
>
> The relevant part of the XML file is:
>     <hostdev mode='subsystem' type='pci' managed='yes'>
>       <driver name='vfio'/>
>       <source>
>         <address domain='0x0000' bus='0x09' slot='0x00' function='0x0'/>
>       </source>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x0a'
> function='0x0'/>
>     </hostdev>
>
> The Audio I'm trying to play: https://www.youtube.com/watch?v=jc8Mm5TtIhg
>
> What it actually sounds like:
> https://drive.google.com/file/d/0B12vXeyT8c8HZ0RqMmpnWDZUdXM/view?usp=sharing
>
> To record the Audio, I plugged the cable into a recorder instead of going
> through speakers or line in on the host to see if it was any other device,
> but it sounds the same on all.
>
> I hope you can help.
> Jon
>
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