[CentOS-virt] Assigning a PCI sound device to a VM

Thu Sep 3 08:14:26 UTC 2015
George Dunlap <dunlapg at umich.edu>

On Thu, Sep 3, 2015 at 2:29 AM, Robert Nichols
<rnicholsNOSPAM at comcast.net> wrote:
> I have a PCI sound card that I would like to assign to a VM, but
> when I try to do so the VM fails to start and displays this message:
> Error starting domain: Unable to read from monitor: Connection reset by peer
> Traceback (most recent call last):
>   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in
> cb_wrapper
>     callback(asyncjob, *args, **kwargs)
>   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in tmpcb
>     callback(*args, **kwargs)
>   File "/usr/share/virt-manager/virtManager/domain.py", line 1125, in
> startup
>     self._backend.create()
>   File "/usr/lib64/python2.6/site-packages/libvirt.py", line 686, in create
>     if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
> libvirtError: Unable to read from monitor: Connection reset by peer
> The XML generated by virt-manager for the device is
>     <hostdev mode='subsystem' type='pci' managed='yes'>
>       <source>
>         <address domain='0x0000' bus='0x07' slot='0x04' function='0x0'/>
>       </source>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> function='0x0'/>
>     </hostdev>
> The sound card is an Asus Xonar DGX PCIe 5.1, and identifies itself
> as "07:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788
> [Oxygen HD Audio]".
> I see the same problem if I try to assign the motherboard's Intel
> Xeon E3-1200 HD Audio Controller to the VM.  Both of these devices
> are supported by the host kernel (3.18.17-13.el6.x86_64).
> I have no problem assigning a USB sound device, but those have very
> limited capability.

Which hypervisor / CentOS version are you using?