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