[Bug 1960580] Re: [22.04 FEAT] [KRN1918] Long kernel command line on s390x

This bug is already Fix Released and closed and was requested for jammy only.
So it wasn't requested for focal, hence updating the tags to 'verification-done-focal' to unblock any processes.

** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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Title:
[22.04 FEAT] [KRN1918] Long kernel command line on s390x

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

Bug description:
Feature: Long kernel command line

Description:
Allow to handle command lines with a length of up to 4096 bytes by kernel. It happened in the past that our supported command line size of 896 bytes was sometimes too short - while x86, powerpc, and arm each support 2048 bytes.

This requires:
- an ABI interface to the kernel image, so that tools can figure out if the kernel supports large command lines (might be a feature bitmap at a fixed location)
- zipl, genprotimg, qemu, kexec-tools and changes (depending on the kernel side implementation)
- in-kernel ipl support changes (IPL from reader)

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