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https://bugs.launchpad.net/bugs/1887921

Title:
  [21.04 FEAT] NVMe IPL Load Normal support - kernel

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  Re-IPL for NVMe is currently done by using diag 308 with the "Load Clear" 
subcode, which means that all memory will be cleared. 
  This can increase re-IPL duration considerably on very large machines.

  For list-directed IPL like NVMe or FCP IPL, a "Load Normal" subcode
  was introduced with z14. The "Load Normal" diag 308 subcode allows to
  re-IPL without clearing memory.

  This feature adds kernel and s390-tools support for a new "clear"
  sysfs attribute in /sys/firmware/reipl/nvme, which can be set to
  either "0" or "1" to disable or enable re-IPL with memory clearing.
  The default value is "0", which disables memory clearing.

  Feature request for kernel contribution.
  Target kernel >= 5.9. Therefore a backport need to be provided

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