** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1847109
Title:
Ubuntu 18.04 - wrong cpu-mf counter number
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
In Progress
Bug description:
SRU Justification:
==================
[Impact]
* wrong cpu-mf counter number of LAST_HOST_TRANSLATIONS
[Fix]
* 81507f38d427ebed3291a3c153a798937c998140 81507f38 "s390/cpum_cf:
correct counter number of LAST_HOST_TRANSLATIONS"
[Test Case]
* inspect the counter number of the LAST_HOST_TRANSLATIONS (virtual)
file
* cat /sys/devices/cpum_cf/events/LAST_HOST_TRANSLATIONS
* returns 'event=0x00e9', but should be 'event=0x00e8'
* event is only available on z14 and higher, hence Canonical can only
do regression testing - IBM the functional verification
[Regression Potential]
* very minimal, patch just changes one hex number in one code line
* change is limited to z14 (and higher) hardware counters only
[Other Info]
* fix/patch got upstream accepted with 4.16
* hence it's already in (cosmic and) disco and eoan and only need to be
applied to bionic 4.15
__________
Kernel:
Linux t35lp11 4.15.0-64-generic #73-Ubuntu SMP Thu Sep 12 13:15:19 UTC 2019
s390x s390x s390x GNU/Linux
Description/Reproduction:
The cpu-mf counter LAST_HOST_TRANSLATIONS has the wrong number.
# cat /sys/devices/cpum_cf/events/LAST_HOST_TRANSLATIONS
event=0x00e9
should be event=0x00e8
Fix already available:
commit 81507f38d427ebed3291a3c153a798937c998140
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