[Bug 1887920] Re: [21.04 FEAT] NVMe IPL Load Normal support - s390-tools part

[Dimitri John Ledkov]

** Information type changed from Private to Public

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Title:
  [21.04 FEAT] NVMe IPL Load Normal support - s390-tools part

Status in Ubuntu on IBM z Systems:
  Triaged
Status in s390-tools package in Ubuntu:
  New

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 s390-tools contribution.
  Target s390-tools >=2.15, therefore backport information required.

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