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----- Original Message -----
> From: "Neil Jerram" <neil at tigera.io>
> To: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>
> Sent: Friday, December 16, 2016 6:40:57 AM
> Subject: [openstack-dev] Issues with libvirt transition 1.2.7 -> 2.0.0	(CentOS 7.3)
> 
> I appreciate that even libvirt 2.0.0 will be ancient history by now, to its
> developers, but I am seeing further issues that look associated with the
> recent CentOS 7 transition from libvirt 1.2.7 to libvirt 2.0.0, and would
> appreciate any comments on them that people may have.  I believe these
> issues are independent of those that have already been discussed on other
> threads.
> 
> First, this traceback in nova-compute.log:
> 
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line
> 2156, in _build_resources
>     yield resources
>   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line
> 2009, in _build_and_run_instance
>     block_device_info=block_device_info)
>   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line
> 2534, in spawn
>     block_device_info=block_device_info)
>   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line
> 4620, in _create_domain_and_network
>     xml, pause=pause, power_on=power_on)
>   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line
> 4550, in _create_domain
>     guest.launch(pause=pause)
>   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line
> 142, in launch
>     self._encoded_xml, errors='ignore')
>   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 195,
> in __exit__
>     six.reraise(self.type_, self.value, self.tb)
>   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line
> 137, in launch
>     return self._domain.createWithFlags(flags)
>   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in
> doit
>     result = proxy_call(self._autowrap, f, *args, **kwargs)
>   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in
> proxy_call
>     rv = execute(f, *args, **kwargs)
>   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in
> execute
>     six.reraise(c, e, tb)
>   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in
> tworker
>     rv = meth(*args, **kwargs)
>   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1065, in
> createWithFlags
>     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed',
> dom=self)
> libvirtError: Cannot find '' in path: No such file or directory
> 
> which I believe is caused by the empty path attribute in this part of the
> XML:
> 
>     <interface type='ethernet'>
>       <mac address='fa:16:3e:3c:96:33'/>
>       <script path=''/>
>       <target dev='tap06992dfb-5d'/>
>       <model type='virtio'/>
>       <driver name='qemu'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
>     </interface>
> 
> which is in turn caused, I think, by
> https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L61
> 
> Is it plausible that libvirt 1.2.7 would have avoided trying to invoke a
> script with an empty path, whereas libvirt 2.0.0 does not?
> 
> Secondly - if I move past the problem above by changing
> https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L61
> to say 'conf.script = None' - I then find:
> - no apparent error in nova-compute.log
> - but my instances don't boot
> - the following messages in the libvirt log:
> 
> Domain id=4 is tainted: high-privileges
> char device redirected to /dev/pts/1 (label charserial1)
> CPU feature tsc_adjust not found
> 
> I guess it's the last message that is the critical one here - can anyone
> tell me more about it?

Hi Neil,

The second seems likely to be related to the addition of support for VMX TSC scaling. What version of qemu are you running? If you haven't already I would suggest grabbing qemu-kvm-ev from the CentOS Virt SIG repos:

    http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/

You can enable the repository using this release RPM:

    http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/centos-release-qemu-ev-1.0-1.el7.noarch.rpm

Thanks,

Steve

> Thanks,
>       Neil
> 
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-- 
Steve Gordon,
Principal Product Manager,
Red Hat OpenStack Platform