** Changed in: linux (Ubuntu Noble)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Plucky)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Noble)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Plucky)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2114258
Title:
[UBUNTU 24.04] Kernel: Add CPUMF extended counter set for z17
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Won't Fix
Status in linux source package in Plucky:
Fix Committed
Status in linux source package in Questing:
Invalid
Bug description:
[ Impact ]
s390/cpumf: Update CPU Measurement facility extended counter set
support
Update CPU Measurement counter facility support for the
extended counter set for machine types 9175 and 9176.
[ Fix ]
Backport the following patch from upstream:
- df194f57de71 s390/cpumf: Update CPU Measurement facility extended counter
set support
[ Test Plan ]
Boot a z17 instance and run the command:
ls -l /sys/devices/cpum_cf/events | wc -l
The output must be 106.
[ Where Problems Could Occur ]
The fix modifies CPUMF event registration for IBM z17. A bug in this
patch may cause incorrect event exposure on unsupported hardware,
leading to invalid perf measurements, sysfs inconsistencies, or kernel
warnings due to misconfigured or non-existent counters.
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Description: kernel: Add CPUMF extended counter set for new IBM z17
machine
Symptom: Extended counter set not exported in /sysfs
Problem: The extended counter set is not exported
when the kernel is booted.
Reproduction: Run command ls -l /sys/devices/cpum_cf/events | wc -l.
If the output is not 106, the extended counter set is
missing.
Solution: Export the extended counter set data in /sysfs
when the kernel is booted.
Upstream-ID: df194f57de7136b94bf25d2dce1da765b6c13654
Author: <[email protected]>
Component: kernel
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