[zvm] Don't require 'vmcp' and 'cpint' kernel modules

[rmetrich]

These modules are not present anymore, at least on RHEL8. The modules are not needed to execute 'vmcp' commands.

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sosreport-sos-3238
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.

[TurboTurtle]

The plugin is currently written to be distro-agnostic, so I'd like to either get a confirmation that these kernel modules are not used on other distributions or we'd need to split up the plugin to be distribution sensitive again.

Alternatively, if RHEL (and derivatives) are the only supported OS(es) for Z environments, then we can take this change as is (and ideally should replace IndependentPlugin with RedHatPlugin).

I'd just like to be 100% sure before merging.

[pmoravec]

If I understood https://www.ibm.com/docs/en/linux-on-systems?topic=c-vmcp properly, then vmcp kmod is available on (some) RHEL8.6, still.

@rmetrich , you say there are systems with no vmcp or cpinit kmod (even available), where either vmcp or hcp command works?

If so, maybe an idea of improvement of kmod predicate that would help here: have a list of all kmods available on the system, and apply the predicate to intersection of the list and kmods list (i.e. apply the kmods list to available kmods only).

[rmetrich]

If I understood https://www.ibm.com/docs/en/linux-on-systems?topic=c-vmcp properly, then vmcp kmod is available on (some) RHEL8.6, still.

@rmetrich , you say there are systems with no vmcp or cpinit kmod (even available), where either vmcp or hcp command works?

If so, maybe an idea of improvement of kmod predicate that would help here: have a list of all kmods available on the system, and apply the predicate to intersection of the list and kmods list (i.e. apply the kmods list to available kmods only).

I don't know, all I did is install a s390x KVM and tried to execute "modprobe vmcp" and there was no such module.
Then commenting out the predicate, I could see "vmcp" commands were just working fine anyway.