------- Comment From fre...@de.ibm.com 2021-09-15 11:54 EDT-------
Ok, with the help of Christian I finally could upgrade a system to Ubuntu 21.10.
Then I downloaded the dep files from franks build and installed them. Here is 
the uname output:
root@t8314009:~# uname -a
Linux t8314009.lnxne.boe 5.13.0-14-generic #14~lp1933805-Ubuntu SMP Mon Aug 16 
07:17:43 UTC 2021 s390x s390x s390x GNU/Linux
So Frank's kernel is running.

I ran my zcrypt tests and also checked that everything I would expect is
there (for example the new /sys/devices/ap/cardxx/max_msg_size sysfs
attributes).

However, as there is currently worldwide no s390 Linux system running
with access to the new crypto card generation this part of the test
needs to be postponed to a later time ... I guess, I'll have access in
about 4 weeks.

I take this as 'verified' now.

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https://bugs.launchpad.net/bugs/1933805

Title:
  [21.10 FEAT] zcrypt DD: CEX8 toleration

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  The CEX8 adapter shall support quantum-safe crypto and therefore requires 
message sizes > 12kB.
  This change is mainly required to support EP11 responses to admin requests at 
zNext which due to QS certificates can grow larger than 12kB.

  This is to cover a minimal patch to provide toleration support for
  this feature which shall be back-ported to all distribution releases
  in service at zNext

  Kernel level >= 5.14

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