[Bug 1829749] Re: Please add support for zipl signing

[Dimitri John Ledkov]

I do wonder, if we can somehow arch-specify opal signing.

Cause it's opal for power, zipl for s390x, yet both just use kmodsign.
Just a different key.

Not sure if i want to copy&paste all the methods, and tests.

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Title:
  Please add support for zipl signing

Status in Launchpad itself:
  New
Status in linux-signed package in Ubuntu:
  New
Status in s390-tools package in Ubuntu:
  New

Bug description:
  Please add support for zipl ("z/ecureBoot") signing.

  It should be similar to opal signing, but using the new zipl signing
  key.

  I am expecting to sign s390-tools stage3.bin and kernel images using
  this key.

  s390-tools -> can be signed already
  kernels -> should only sign v5.2+

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