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

Thu Sep 3 18:59:37 UTC 2015
Robert Nichols <rnicholsNOSPAM at comcast.net>

On 09/03/2015 03:14 AM, George Dunlap wrote:
> 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
>> 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?

libvirt-0.10.2-54.el6.x86_64 in CentOS 6.7,
using kernel-3.18.17-13.el6.x86_64 from the Xen4CentOS 6 repo.
(I need that kernel for the motherboard's sound controller.  The
  behavior when trying to assign a PCI device to the VM is the
  same with the standard 2.6.32 kernel in CentOS 6.7.)

Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.