Hello, I'm importing a VM into a new oVirt environment that is in 4.3.10: the new host is the same as the previous one (only difference it is in 4.3.10 while the old one in 4.3.9). This VM acted as a single host HCI environment (with 4.3.9). I imported the storage domain containing the VM and its disks and the VM boots ok. Now its Hosted Engine VM (that is so a nested VM) doesn't start. I think it was good when I stopped/detached it... and so I would like to cross check and verify if I missed something configuring the new environment or something changed from 4.3.9 to 4.3.10 In vdsm.log I see this reason: 2020-07-23 14:38:20,489+0200 ERROR (vm/9233dc8b) [virt.vm] (vmId='9233dc8b-7a4d-4fac-8551-dc7407f36548') The vm start process failed (vm: 934) Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 868, in _startUnderlyingVm self._run() File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2892, in _run dom = self._connection.defineXML(self._domain.xml) File "/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py", line 131, in wrapper ret = f(*args, **kwargs) File "/usr/lib/python2.7/site-packages/vdsm/common/function.py", line 94, in wrapper return func(inst, *args, **kwargs) File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3743, in defineXML if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self) libvirtError: invalid argument: could not find capabilities for arch=x86_64 domaintype=kvm The relevant parts of the generated xml in vdsm.log seems: 2020-07-23 14:38:20,487+0200 INFO (vm/9233dc8b) [virt.vm] (vmId='9233dc8b-7a4d-4fac-8551-dc7407f36548') <?xml version="1.0" encoding="ut f-8"?><domain type="kvm" xmlns:ns0="http://ovirt.org/vm/tune/1.0" xmlns:ovirt-vm="http://ovirt.org/vm/1.0"> <name>HostedEngine</name> <uuid>9233dc8b-7a4d-4fac-8551-dc7407f36548</uuid> <memory>16777216</memory> <currentMemory>16777216</currentMemory> <iothreads>1</iothreads> <maxMemory slots="16">67108864</maxMemory> <vcpu current="2">32</vcpu> <sysinfo type="smbios"> <system> <entry name="manufacturer">oVirt</entry> <entry name="product">oVirt Node</entry> <entry name="version">7-7.1908.0.el7.centos</entry> <entry name="serial">704e1338-5dec-46f8-a186-8c2080dcefd8</entry> <entry name="uuid">9233dc8b-7a4d-4fac-8551-dc7407f36548</entry> </system> </sysinfo> <clock adjustment="0" offset="variable"> <timer name="rtc" tickpolicy="catchup"/> <timer name="pit" tickpolicy="delay"/> <timer name="hpet" present="no"/> </clock> <features> <acpi/> </features> <cpu match="exact"> <model>Skylake-Server</model> <feature name="spec-ctrl" policy="require"/> <feature name="ssbd" policy="require"/> <feature name="md-clear" policy="require"/> <topology cores="2" sockets="16" threads="1"/> <numa> <cell cpus="0,1" id="0" memory="16777216"/> </numa> </cpu> <cputune/> ... </metadata> <on_poweroff>destroy</on_poweroff><on_reboot>destroy</on_reboot><on_crash>destroy</on_crash></domain> (vm:2890) Any insights? The configuration of the new 4.3.10 physical oVirt environment that contains the VM has this cluster cpu type: Intel Skylake Server IBRS SSBD MDS Family Do I have to change it to anything else? I don't remember how it was set in 4.3.9 Thanks in advance, Gianluca