libvirt users - Jul 2014 - Re: vhost-net requested but could not be initialized

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

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

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
> --
> |: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/
> :|
> |: http://libvirt.org              -o-             http://virt-manager.org
> :|
> |: http://autobuild.org       -o-         http://search.cpan.org/~danberr/
> :|
> |: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc
> :|
>


-- 
Cheers,

Asadullah Hussain

Currently in the VM XML, I am passing the following command line argument
as a passthrough argument:
-netdev type=tap,id=net1,script=no,downscript=no,ifname=port3,vhost=on
-device
virtio-net-pci,netdev=net1,mac=00:00:00:00:00:01,csum=off,gso=off,guest_tso4=off,guest_tso6=off,guest_ecn=off

Is there another way to represent this in the XML file? maybe that may
solve the problem.


On 24 July 2014 15:55, Asadullah Hussain <asadxflow@gmail.com> wrote:
>
>
>
> 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
>> --
>> |: http://berrange.com      -o-
>> http://www.flickr.com/photos/dberrange/ :|
>> |: http://libvirt.org              -o-
>> http://virt-manager.org :|
>> |: http://autobuild.org       -o-
>> http://search.cpan.org/~danberr/ :|
>> |: http://entangle-photo.org       -o-
>> http://live.gnome.org/gtk-vnc :|
>>
>
>
>
> --
> Cheers,
>
> Asadullah Hussain
>


-- 
Cheers,

Asadullah Hussain