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[Frank Heimes <2078347@xxxxxxxxxxxxxxxxxx>]

** Changed in: s390-tools (Ubuntu Noble)
       Status: Triaged => In Progress

** Changed in: s390-tools (Ubuntu Plucky)
       Status: Triaged => In Progress

** Changed in: s390-tools-signed (Ubuntu Noble)
       Status: Triaged => In Progress

** Changed in: s390-tools-signed (Ubuntu Plucky)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/2078347

Title:
  [UBUNTU 24.04] Udev/rules: Missing rules causes newly added CPUs to
  stay offline

Status in Ubuntu on IBM z Systems:
  In Progress
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools-signed package in Ubuntu:
  Fix Released
Status in s390-tools source package in Noble:
  In Progress
Status in s390-tools-signed source package in Noble:
  In Progress
Status in s390-tools source package in Plucky:
  In Progress
Status in s390-tools-signed source package in Plucky:
  In Progress
Status in s390-tools source package in Questing:
  Fix Released
Status in s390-tools-signed source package in Questing:
  Fix Released

Bug description:
  ---Problem Description----------------------------------------------------------------------------------
  Adding a configured CPU to a system (LPAR, ZVM or KVM) leaves that CPU configured but hotplugged off.

  # lscpu -e
  CPU NODE DRAWER BOOK SOCKET CORE L1d:L1i:L2 ONLINE CONFIGURED POLARIZATION ADDRESS
    0    0      0    0      0    0 0:0:0         yes yes        horizontal   0
    1    0      0    0      1    1 1:1:1         yes yes        horizontal   1
    2    0      0    0      2    2 2:2:2         yes yes        horizontal   2
    3    0      0    0      3    3 3:3:3         yes yes        horizontal   3
    4    0      0    0      4    4 4:4:4         yes yes        horizontal   4
    5    0      0    0      5    5 5:5:5         yes yes        horizontal   5
    6    -      -    -      -    - -              no yes        horizontal   6
    7    -      -    -      -    - -              no yes        horizontal   7
   
  ---Debugger---
  A debugger is not configured
   
  Machine Type = z/VM, LPAR 
   
  ---uname output---
  6.8.0-41-generic #41-Ubuntu SMP Fri Aug  2 19:51:49 UTC 2024 s390x s390x s390x GNU/Linux
   
  ---Steps to Reproduce---
  Easiest way to reproduce is using a KVM guest to add new CPUs.

  1. Before adding CPUs:

  $ virsh dumpxml vm
  <domain type='kvm' id='106'>
     ...
    <vcpu placement='static' current='6'>8</vcpu>
    <vcpus>
      <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/>
      <vcpu id='1' enabled='yes' hotpluggable='no' order='2'/>
      <vcpu id='2' enabled='yes' hotpluggable='yes' order='3'/>
      <vcpu id='3' enabled='yes' hotpluggable='yes' order='4'/>
      <vcpu id='4' enabled='yes' hotpluggable='yes' order='5'/>
      <vcpu id='5' enabled='yes' hotpluggable='yes' order='6'/>
      <vcpu id='6' enabled='no' hotpluggable='yes'/>
      <vcpu id='7' enabled='no' hotpluggable='yes'/>

  2. Attempt to add CPUs to the guest in a "running" state. 
  $ virsh setvcpus vm 8 --live

  3. The guest XML is updated :
     ...
    <vcpu placement='static'>8</vcpu>
    <vcpus>
      <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/>
      <vcpu id='1' enabled='yes' hotpluggable='no' order='2'/>
      <vcpu id='2' enabled='yes' hotpluggable='yes' order='3'/>
      <vcpu id='3' enabled='yes' hotpluggable='yes' order='4'/>
      <vcpu id='4' enabled='yes' hotpluggable='yes' order='5'/>
      <vcpu id='5' enabled='yes' hotpluggable='yes' order='6'/>
      <vcpu id='6' enabled='yes' hotpluggable='yes' order='7'/>
      <vcpu id='7' enabled='yes' hotpluggable='yes' order='8'/>
    </vcpus>

  4. But inside the guest, the CPUs are in offline state:
  $ lscpu -e
  CPU NODE DRAWER BOOK SOCKET CORE L1d:L1i:L2 ONLINE CONFIGURED POLARIZATION ADDRESS
    0    0      0    0      0    0 0:0:0         yes yes        horizontal   0
    1    0      0    0      1    1 1:1:1         yes yes        horizontal   1
    2    0      0    0      2    2 2:2:2         yes yes        horizontal   2
    3    0      0    0      3    3 3:3:3         yes yes        horizontal   3
    4    0      0    0      4    4 4:4:4         yes yes        horizontal   4
    5    0      0    0      5    5 5:5:5         yes yes        horizontal   5
    6    -      -    -      -    - -              no yes        horizontal   6
    7    -      -    -      -    - -              no yes        horizontal   7

  5. Post rebooting the guest, the CPUs are  online:
  $ virsh reboot vm

  Inside the guest:
  $ lscpu -e
  CPU NODE DRAWER BOOK SOCKET CORE L1d:L1i:L2 ONLINE CONFIGURED POLARIZATION ADDRESS
    0    0      0    0      0    0 0:0:0         yes yes        horizontal   0
    1    0      0    0      1    1 1:1:1         yes yes        horizontal   1
    2    0      0    0      2    2 2:2:2         yes yes        horizontal   2
    3    0      0    0      3    3 3:3:3         yes yes        horizontal   3
    4    0      0    0      4    4 4:4:4         yes yes        horizontal   4
    5    0      0    0      5    5 5:5:5         yes yes        horizontal   5
    6    0      0    0      6    6 6:6:6         yes yes        horizontal   6
    7    0      0    0      7    7 7:7:7         yes yes        horizontal   7

  The CPUs should be online after adding them to the system.

  Other distros already have a udev rule to circumvent this under;
  /etc/udev/rules.d/

  The rule does a check if a newly added CPUs are configured but not online, then hotplugs it to make it online. If CPUs are NOT configured then they should stay offline.
   
  Contact Information = mete.durlu@xxxxxxx

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