Hi, that CPU looks rather good to me: KVM/oVirt should love it (as would I)!

I am actually more inclined to believe that it may be a side channel mitigation 
issue: KVM is distingiuishing between base CPUs and CPUs with enabled 
mitigations to ensure that you won't accidentally migrate a VM from a 'safe' 
CPU to one that's vulnerable.

So I suggest you have a look at that, seen what's enabled in BIOS and via 
microcode updates and check that against what the cluster wants. Perhaps it may 
involve as little as ensuring all current patches are in (with reboots) after 
the update to 8.3.

E.g. you might see this when the cluster was previously running on a system 
with mitigations active, but now mitigations are off (e.g. because the latest 
microcode updates are not loaded yet).

My personal impression is that it wasn't a terribly good idea to mix 
mitigations and CPU capabilities, but that they didn't have time/means for a 
full redesign to what they might have hoped was a singular/one shot issue, 
before it developed into a whole family of cancers.


Bonne chance!
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