Somewhere along the way in oVirt old CPU support was dropped for windows compatibility reasons.
Nehalems were dropped, and westmeres would report as nehalems and then fail if AES wasn't turned on in the bios.
So this is a case of ERROR_CPU_TOO_OLD.  (They're also power hungry compared to modern CPUs)

As you're trying standalone, I'd suggest a basic KVM host if it was the only server I had.

On Mon, Aug 30, 2021 at 5:48 AM marek <cervajs64@gmail.com> wrote:
ovirt 4.4.8 standalone

cluster cpu type: nehalem family

ovirt host centos 8 stream

ovirt gui info: Host CPU type is not supported in this cluster
compatibility version or is not supported at all.

vdsm.log

2021-08-30 11:30:58,600+0200 ERROR (jsonrpc/4) [root] Error while
getting domain capabilities (machinetype:92)
Traceback (most recent call last):
   File "/usr/lib/python3.6/site-packages/vdsm/common/cache.py", line
41, in __call__
     return self.cache[args]
KeyError: ()

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
   File "/usr/lib/python3.6/site-packages/vdsm/machinetype.py", line 90,
in _get_domain_capabilities
     domcaps = conn.getDomainCapabilities(None, arch, None, virt_type, 0)
   File
"/usr/lib/python3.6/site-packages/vdsm/common/libvirtconnection.py",
line 131, in wrapper
     ret = f(*args, **kwargs)
   File "/usr/lib/python3.6/site-packages/vdsm/common/function.py", line
94, in wrapper
     return func(inst, *args, **kwargs)
   File "/usr/lib64/python3.6/site-packages/libvirt.py", line 4493, in
getDomainCapabilities
     raise libvirtError('virConnectGetDomainCapabilities() failed')
libvirt.libvirtError: internal error: unknown feature amd-sev-es
2021-08-30 11:30:58,650+0200 ERROR (jsonrpc/4) [root] Error while
getting CPU features: no domain capabilities found (machinetype:188)

model name      : Intel(R) Xeon(R) CPU           E5504  @ 2.00GHz

cat /sys/devices/cpu/caps/pmu_name
nehalem

  grep -E 'svm|vmx' /proc/cpuinfo | grep nx

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ht tm pbe syscall
nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology
nonstop_tsc cpuid aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3
cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm pti ssbd ibrs ibpb stibp
tpr_shadow vnmi flexpriority ept vpid dtherm flush_l1d
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