------- Comment From [email protected] 2025-04-29 08:24 EDT-------
Hi, since there hasn't been movement for a while, it has been pointed out to me 
that
sharing a udev rule proposal regarding the issue might help;

How about sth like below?

SUBSYSTEM=="cpu", ACTION=="add", CONST{arch}=="s390*",
ATTR{configure}=="1", TEST=="online", ATTR{online}!="1",
ATTR{online}="1"

rule above should automatically hotplug any CPUs added to the system in 
configured
state.

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https://bugs.launchpad.net/bugs/2078347

Title:
  [UBUNTU 24.04] Udev/rules: Missing rules causes newly added CPUs to
  stay offline

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