Have you tried enabling MSI for the passed-through sound device as
described on Alex' blog here:
http://vfio.blogspot.de/2014/09/vfio-interrupts-and-how-to-coax-windows.html
This usually solves the problems with choppy audio.
Cheers,
Hristo
Am 30.09.2016 13:00, schrieb Jonathan Scruggs:
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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