Private bug reported:

The kernel patch(es) of LP 1743560
'KVM patches for s390x to provide facility bits 81 (ppa15) and 82 (bpb)'
(accepted upstream)
introduced a problem due to spurious zeroing of r0.

The following fix is addressing this:
s390/entry.S: fix spurious zeroing of r0

If our X, A and B kernels are affected by the above issue (what is
probably the case if the upstream patches got used), then the fix/patch
(commit d3f468963cd6fd6d2aa5e26aed8b24232096d0e1) needs to be applied,

** Affects: ubuntu-z-systems
     Importance: Critical
     Assignee: Canonical Kernel Team (canonical-kernel-team)
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: s390x

** Information type changed from Public to Private

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
   Importance: Undecided => Critical

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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  Fix spurious zeroing of r0

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