On 24 July 2014 15:52, Daniel P. Berrange <berrange@redhat.com> wrote:

On Thu, Jul 24, 2014 at 03:48:06PM +0500, Asadullah Hussain wrote:
> Let me clarify my question, I am using unmodified stock qemu (1.4.0) and
> only the location of vhost file descriptor is different from default (I
> don't remove the default /dev/vhost-net directory)
>
> The VHOST file descriptor is present in "/dev/vhost-0" directory instead of
> the default "/dev/vhost-net". When I try to give vhostfd in the XML I get a
> different error:

Well I suggest you make your system use the expected device
name for /dev/vhost-net. Just as libvirt only targets mainline
QEMU, we only target mainline kernel / standard device layout

I was able to change my device name to /dev/vhost-net but still I get the error, the error itself isn't telling much about the problem:

2014-07-24 10:41:35.970+0000: 3183: error : qemuMonitorOpenUnix:293 : failed to connect to monitor socket: No such process

2014-07-24 10:41:35.970+0000: 3183: error : qemuProcessWaitForMonitor:1806 : internal error process exited while connecting to monitor: qemu-system-x86_64: -netdev type=tap,id=net1,script=no,downscript=no,ifname=port4,vhost=on: vhost-net requested but could not be initialized

qemu-system-x86_64: -netdev type=tap,id=net1,script=no,downscript=no,ifname=port4,vhost=on: Device 'tap' could not be initialized

Regards,
Daniel
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Cheers,

Asadullah Hussain