Public bug reported:
---Problem Description---
CPI information about kvm usage is lost during apt upgrade
---uname output---
4.15.0-42-generic
Machine Type = s390x lpar
---Steps to Reproduce---
# cat /sys/firmware/cpi/*
cat: /sys/firmware/cpi/set: Permission denied
0x0000000000040f00
LINUX
root@m83lp52:~# virsh start guest # starting a guest does set the highest bit
in
/sys/firmware/cpi/system_leveln
root@m83lp52:~# cat /sys/firmware/cpi/*
cat: /sys/firmware/cpi/set: Permission denied
0x8000000000040f00 <---- see the 8
LINUX
root@m83lp52:~# apt upgrade
[....]
has to upgrade at least one package, that will trigger some other code.
[....]
Now. some other code seems to have set values in /sys/firmware/cpi as
well dropping the kvm information.
root@m83lp52:~# cat /sys/firmware/cpi/*
cat: /sys/firmware/cpi/set: Permission denied
18 04 1
0x0000000000040f00
UBUNTU
LINUX
The canonical place to handle /sys/firmware/cpi should be
/lib/s390-tools/cpictl and /lib/systemd/system/cpi.service. So can we put the
additional features (setting 18 04 1 and UBUNTU things also into
/etc/sysconfig/cpi
or
/lib/s390-tools/cpictl
)
and can we disable the other code that also sets /sys/firmware/cpi (I have not
found out which code sets these values). This seems to be
/lib/systemd/system-generators/s390-cpi-vars
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-173674 severity-high
targetmilestone-inin---
** Tags added: architecture-s39064 bugnameltc-173674 severity-high
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1805841
Title:
CPI information about kvm usage is lost during apt upgrade
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