Changing "linux (Ubuntu)" to Fix Released, since the patch got upstream
accepted with kernel 5.0 and in between kernel 5.2 landed in Eoan's release
pocket.
Hence the entire ticket is Fix Released.
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
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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:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
== Justification ==
The s390x early machine detection code check will set all the uknown
hypervisors to z/VM, this will cause crash for any non KVM, z/VM
system.
== Fixes ==
03aa047e (s390/early: improve machine detection)
Patch can be cherry-picked into Bionic kernel.
Instead of setting all the other hypervisors to z/VM, it will only set
MACHINE_FLAG_VM if it matches the case.
== Tests ==
A test kernel could be found here:
https://people.canonical.com/~phlin/kernel/lp-1829972-s390x-early/
Boot tested on a s390x KVM node and verified by IBM as well.
== Regression Potential ==
Low, this just improves the detection logic and the changes are
specific to s390x.
== Original Bug Report ==
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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