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[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

** Also affects: s390-tools (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: s390-tools (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1794308

Title:
  VM devices rdr, pun and prt are not activated after restart

Status in s390-tools:
  Unknown
Status in Ubuntu on IBM z Systems:
  Fix Released
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools source package in Xenial:
  New
Status in s390-tools source package in Bionic:
  New

Bug description:
  [Impact]

   * Cannot configure race-free generic-ccw devices to be onlined on
  boot.

  [Test Case]

  # on a z/VM

  $ sudo chzdev -d 0.0.000c 0.0.000d 0.0.000e
  $ sudo chzdev -e 0.0.000c 0.0.000d 0.0.000e
  $ sudo update-initramfs -u
  $ sudo reboot
  $ lszdev

  Expectations is for generic-ccw c-d-e devices to be "yes yes" meaning online and persistent online.
  Previously after a reboot they would be "no yes" meaning offline yet persistent configured online.

  [Regression Potential]

   * generic-ccw rules need to be `upgraded` / `regenerated` which is
  not done in maintainer scripts in this upload for now.

  [Other Info]

   * fix contributed upstream at

  https://github.com/ibm-s390-tools/s390-tools/pull/45/files

   * original bug report

  Linux s390x as VM guest can use the VM-specific reader (0.0.000c),
  puncher (0.0.000d) and printer devices (0.0.000e).

  They can be enabled as usual with chzdev like:
  lszdev | grep '000c\|000d\|000e'
  generic-ccw  0.0.000c                    no   no
  generic-ccw  0.0.000d                    no   no
  generic-ccw  0.0.000e                    no   no
  sudo chzdev -e 000c 000d 000e
  Generic CCW device 0.0.000c configured
  Generic CCW device 0.0.000d configured
  Generic CCW device 0.0.000e configured
  lszdev | grep '000c\|000d\|000e'
  generic-ccw  0.0.000c                    yes  yes   vmrdr-0.0.000c
  generic-ccw  0.0.000d                    yes  yes   vmpun-0.0.000d
  generic-ccw  0.0.000e                    yes  yes   vmprt-0.0.000e

  Aa a result of that activation udev rules are generated:
  ls -la /etc/udev/rules.d/41-generic-ccw-0.0.000{c,d,e}.rules
  -rw-r--r-- 1 root root  238 Sep 21 06:24 41-generic-ccw-0.0.000c.rules
  -rw-r--r-- 1 root root  238 Sep 21 06:24 41-generic-ccw-0.0.000d.rules
  -rw-r--r-- 1 root root  238 Sep 25 10:15 41-generic-ccw-0.0.000e.rules
  cat /etc/udev/rules.d/41-generic-ccw-0.0.000{c,d,e}.rules
  # Generated by chzdev
  ACTION=="add", SUBSYSTEM=="ccw", KERNEL=="0.0.000c", GOTO="cfg_generic_ccw_0.0.0
  00c"
  GOTO="end_generic_ccw_0.0.000c"

  LABEL="cfg_generic_ccw_0.0.000c"
  ATTR{[ccw/0.0.000c]online}="1"

  LABEL="end_generic_ccw_0.0.000c"
  # Generated by chzdev
  ACTION=="add", SUBSYSTEM=="ccw", KERNEL=="0.0.000d", GOTO="cfg_generic_ccw_0.0.0
  00d"
  GOTO="end_generic_ccw_0.0.000d"

  LABEL="cfg_generic_ccw_0.0.000d"
  ATTR{[ccw/0.0.000d]online}="1"

  LABEL="end_generic_ccw_0.0.000d"
  # Generated by chzdev
  ACTION=="add", SUBSYSTEM=="ccw", KERNEL=="0.0.000e", GOTO="cfg_generic_ccw_0.0.0
  00e"
  GOTO="end_generic_ccw_0.0.000e"

  LABEL="cfg_generic_ccw_0.0.000e"
  ATTR{[ccw/0.0.000e]online}="1"

  LABEL="end_generic_ccw_0.0.000e"

  Once this is done it's expected that this configuration is persistent
  and that these three devices are automatically activated after a
  reboot, which is not the case:

  lszdev | grep '000c\|000d\|000e'
  generic-ccw  0.0.000c                    no  yes
  generic-ccw  0.0.000d                    no  yes
  generic-ccw  0.0.000e                    no  yes

  A 'sudo udevadm trigger' doesn't help to activate them again.

  Another 'sudo chzdev -e 000c 000d 000e' helps, but again for the
  current session only.

  [
  The cio_ignore list is empty, hence this can't be the reason:
  cio_ignore -l
  Ignored devices:
  =================
  $
  ]

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