Kernel SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2019-October/thread.html#104595
Changing status to 'In Progress'.
** Description changed:
+ 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
** Changed in: ubuntu-z-systems
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1847109
Title:
Ubuntu 18.04 - wrong cpu-mf counter number
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