Hello,
I tried to setup UserDefinedVMProperties to disable macspoofing for a vm
that has to work as hypervisor.
Then I remembered suggestion of Simone about creating vnic profile as an
alternate method and set there the filter.

I think I have done something wrong because if I create now a new vm and
try to power on it I get

VM test is down with error. Exit message: Hook Error: ('',).

Perhaps I failed the syntax  to reset the value of UserDefinedVMProperties ?

I used
[root@ovirt ~]# engine-config -s "UserDefinedVMProperties="
Please select a version:
1. 4.1
2. 3.6
3. 4.0
4. 4.2
4
[root@ovirt ~]# engine-config -g UserDefinedVMProperties
UserDefinedVMProperties:  version: 4.1
UserDefinedVMProperties:  version: 3.6
UserDefinedVMProperties:  version: 4.0
UserDefinedVMProperties:  version: 4.2
[root@ovirt ~]# systemctl restart ovirt-engine
[root@ovirt ~]#

What could be wrong?
Old created VMs start without problem. In the middle I updated the engine
from 4.2.5.2 to 4.2.5.3 and also hypervisor packages, where vdsm has
remained at level
Aug 03 23:55:09 Updated: vdsm-4.20.35-1.el7.x86_64

In particular:
[root@ovirt01 ~]# rpm -qa|grep vdsm
vdsm-jsonrpc-4.20.35-1.el7.noarch
vdsm-common-4.20.35-1.el7.noarch
vdsm-hook-nestedvt-4.20.35-1.el7.noarch
vdsm-yajsonrpc-4.20.35-1.el7.noarch
vdsm-hook-ethtool-options-4.20.35-1.el7.noarch
vdsm-hook-vhostmd-4.20.35-1.el7.noarch
vdsm-hook-vmfex-dev-4.20.35-1.el7.noarch
vdsm-client-4.20.35-1.el7.noarch
vdsm-4.20.35-1.el7.x86_64
vdsm-hook-vfio-mdev-4.20.35-1.el7.noarch
vdsm-api-4.20.35-1.el7.noarch
vdsm-hook-fcoe-4.20.35-1.el7.noarch
vdsm-network-4.20.35-1.el7.x86_64
vdsm-hook-openstacknet-4.20.35-1.el7.noarch
vdsm-python-4.20.35-1.el7.noarch
vdsm-http-4.20.35-1.el7.noarch
[root@ovirt01 ~]#

The error on hypervisor:

2018-08-21 15:21:28,760+0200 ERROR (vm/eaaee084) [virt.vm]
(vmId='eaaee084-1949-4aae-85c2-6bf46fce7cef') The vm start process failed
(vm:94
2)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 871, in
_startUnderlyingVm
    self._run()
  File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2864, in
_run
    self._buildDomainXML(),
  File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2253, in
_buildDomainXML
    dom, self.id, self._custom['custom'])
  File "/usr/lib/python2.7/site-packages/vdsm/virt/domxml_preprocess.py",
line 240, in replace_device_xml_with_hooks_xml
    dev_custom)
  File "/usr/lib/python2.7/site-packages/vdsm/common/hooks.py", line 136,
in before_device_create
    params=customProperties)
  File "/usr/lib/python2.7/site-packages/vdsm/common/hooks.py", line 122,
in _runHooksDir
    raise exception.HookError(err)
HookError: Hook Error: ('',)
2018-08-21 15:21:28,760+0200 INFO  (vm/eaaee084) [virt.vm]
(vmId='eaaee084-1949-4aae-85c2-6bf46fce7cef') Changed state to Down: Hook
Error:
 ('',) (code=1) (vm:1682)


I found this, but it doesn't seem related:
https://bugzilla.redhat.com/show_bug.cgi?id=1518703

Thanks in advance for any hint,

Gianluca
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