** 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 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. + + --- + 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. + 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. + 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. - + when the kernel is booted. Upstream-ID: df194f57de7136b94bf25d2dce1da765b6c13654 Author: <[email protected]> Component: kernel
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2114258 Title: [UBUNTU 24.04] Kernel: Add CPUMF extended counter set for z17 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/2114258/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
