** Description changed:
+ [ 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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https://bugs.launchpad.net/bugs/2121811
Title:
[UBUNTU 22.04] Support CPU-MF Counters for new IBM z17 - kernel part
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