Ubuntu on IBM z Systems

  1. Bug #1719297
  2. Comment #8

Comment 8 for bug 1719297

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2017-09-28 10:22 EDT-------
If you have an older QEMU than 2.10 you cannot choose -cpu z14 so it should not matter.

The last update was not precise. While qemu 2.10 is sufficient, so is 2.5.
Let me explain:

The kernel commit changes the Sigp handling in the kernel. This is only used if the QEMU version is older than 2.3 because since QEMU 2.3 (commit f16d3f58748acff4c23f9149c3261844b4d595d5 s390x/kvm: enable the new SIGP handling in user space) sigp set architecture is handled in QEMU anyway and the kernel part is never executed.

So kernel commit b697e435aeee99b7 is really just a fixup if somebody uses an ancient QEMU and not necessary. for 16.04 or later.