pci passthrough

[Mike Wright]

Hi all,

I need help debugging this situation.

Running xen-4.2.1 with kernel 3.8.5-201.fc18.x86_64.

I have successfully passed an on-board audio adapter to a VM running f14 
but it does not work.

When f14 runs on bare metal it has full audio capability.

"lspci" on VM-f14 correctly shows:

00:00.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) (rev 40)

"lsmod | grep snd" shows:

snd_hda_codec_realtek   322852  1
snd_hda_intel          23945  2
snd_hda_codec          83791  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep               6288  1 snd_hda_codec
snd_seq                52985  0
snd_seq_device          5969  1 snd_seq
snd_pcm                79886  2 snd_hda_intel,snd_hda_codec
snd_timer              19363  2 snd_seq,snd_pcm
snd                    63685  12 
snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer
soundcore               6329  1 snd
snd_page_alloc          7359  2 snd_hda_intel,snd_pcm

All the pieces seem to be there.

However, "System->Preferences->Sound->Hardware" is empty and 
"System->Preferences->Sound->Output" shows only "Dummy Output,
Stereo".

Anybody know how to debug this?

Right now I have to use Domain0 for multimedia, which seems to pervert 
the whole concept of keeping Domain0 away from general users.

Please, Thanks, All of the above :)
Mike Wright

[Pasi Kärkkäinen]

On Tue, Apr 16, 2013 at 10:24:01AM -0700, Mike Wright wrote:
>  Hi all,
>  
>  I need help debugging this situation.
>  
>  Running xen-4.2.1 with kernel 3.8.5-201.fc18.x86_64.
>  
>  I have successfully passed an on-board audio adapter to a VM running
>  f14 but it does not work.
>  
>  When f14 runs on bare metal it has full audio capability.
>  
>  "lspci" on VM-f14 correctly shows:
>  
1) Please compare "lspci -vvv" between baremetal and the VM

2) Is this a PV or HVM guest? 

3) Any errors in the Xen dmesg (xm dmesg, or xl dmesg)

4) Did you try using pci-alignment for the audio card? 


-- Pasi

 
>  00:00.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
> (rev 40)
>  
>  "lsmod | grep snd" shows:
>  
>  snd_hda_codec_realtek   322852  1
>  snd_hda_intel          23945  2
>  snd_hda_codec          83791  2 snd_hda_codec_realtek,snd_hda_intel
>  snd_hwdep               6288  1 snd_hda_codec
>  snd_seq                52985  0
>  snd_seq_device          5969  1 snd_seq
>  snd_pcm                79886  2 snd_hda_intel,snd_hda_codec
>  snd_timer              19363  2 snd_seq,snd_pcm
>  snd                    63685  12
> snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer
>  soundcore               6329  1 snd
>  snd_page_alloc          7359  2 snd_hda_intel,snd_pcm
>  
>  All the pieces seem to be there.
>  
>  However, "System->Preferences->Sound->Hardware" is empty and
>  "System->Preferences->Sound->Output" shows only "Dummy Output,
>  Stereo".
>  
>  Anybody know how to debug this?
>  
>  Right now I have to use Domain0 for multimedia, which seems to
>  pervert the whole concept of keeping Domain0 away from general
>  users.
>  
>  Please, Thanks, All of the above :)
>  Mike Wright
>  --
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