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
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