On s390x it only uses sysinfo for systemd-detect-virt,
  src/basic/virt.c:306:        r = get_proc_field("/proc/sysinfo", "VM00 
Control Program", 
  WHITESPACE, &t);

but there also the Host UUID is exposed:
  $ cat /proc/sysinfo
  VM00 UUID:            0804001f-c45f-4345-994f-9fec048e822e

There it also seems not used to (re-)generate a machine ID consistently:

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https://bugs.launchpad.net/bugs/1824810

Title:
  use host uuid on kvm on power too

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