** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Won't Fix
** Changed in: ubuntu-z-systems
Status: In Progress => Won't Fix
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https://bugs.launchpad.net/bugs/2121811
Title:
[UBUNTU 22.04] Support CPU-MF Counters for new IBM z17 - kernel part
Status in Ubuntu on IBM z Systems:
Won't Fix
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Won't Fix
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 160.
[ 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.
---
Description:
Support for CPU-MF counters of new IBM z17 in kernel, s390-tools, perf
(kernel) and libpfm4.
This bug covers the kernel part of the item which requires the
following two commits:
f10933cbd2df ("s390/cpum_cf: make crypto counters upward compatible across
machine types")
df194f57de71 ("s390/cpumf: Update CPU Measurement facility extended counter
set support")
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