------- Comment From heinz-werner_se...@de.ibm.com 2019-05-22 08:57 EDT-------
Increased severity to high

** Tags removed: severity-medium
** Tags added: severity-high

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https://bugs.launchpad.net/bugs/1829972

Title:
  Require improved hypervisor detection patch in Ubuntu 18.04

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  This kernel commit is requested to be included into the bionic's
  4.15.0 LTS  kernel:

  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=03aa047ef2db4985e444af6ee1c1dd084ad9fb4c

  s390/early: improve machine detection

  Right now the early machine detection code check stsi 3.2.2 for "KVM"
  and set MACHINE_IS_VM if this is different. As the console detection
  uses diagnose 8 if MACHINE_IS_VM returns true this will crash Linux
  early for any non z/VM system that sets a different value than KVM.
  So instead of assuming z/VM, do not set any of MACHINE_IS_LPAR,
  MACHINE_IS_VM, or MACHINE_IS_KVM.

  This is required for a dedicated SSC exploiter

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