group.of.nepali.translators team mailing list archive

[Frank Heimes <1780773@xxxxxxxxxxxxxxxxxx>]

** Changed in: ubuntu-z-systems
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1780773

Title:
  [18.10 FEAT] zKVM: CPU Model z14 ZR 1

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Xenial:
  Won't Fix
Status in qemu source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * Backport definition of the new machine type as HW exploitation for 
     z14R1

   * Trivial change just making the type known to qemu will fulfill IBMs 
     need on this.

  [Test Case]

   * Use qemu/KVM on a z14R1 and check the cpu features.
     Lacking such a system the real verification relies on IBM who confirmed 
     to do it.
   * While unable to really use it for a lot of benefit, you can check the 
     definition exists at least with:
       $ qemu-system-s390x -cpu ? | grep z14
     After the fix this gets the two extra lines:
      s390 z14ZR1-base     IBM z14 Model ZR1 GA1               (static, migration-safe)
      s390 z14ZR1          IBM z14 Model ZR1 GA1               (migration-safe)

  [Regression Potential]

   * I know we are encouraged to think about all possible regressions, but 
     here it is hard to find one. A one line change to a set of definitions
     that are checked against the machine type.
     I could only think of fake machine types 3907 environments changing 
     (doesn't exist)
     Well real z14R1 machines will after the change behave differently by 
     detecting the type correctly, but that is just what is requested in 
     this backport.

  
  [Other Info]
   
   * n/a

  ----

  Feature Description

  Provide the CPU model for the IBM z14 ZR1 to enable KVM guests to
  exploit new hardware features on the z14 ZR1

  The required patch is

  commit f0b9be93001e6215dc1195f3d75ad2da8b3b694a (qemu 3.0)

  s390x/cpumodels: add z14 Model ZR1

  Introduce the new z14 Model ZR1 cpu model. Mostly identical to z14, only
  the cpu type differs (3906 vs. 3907)

  Business Case
  Support z14 ZR1 hardware features with KVM guests

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