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Description of problem:
Seems we have a undocumented parameter named 'loadparm' in qemu

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
[root@kernelqe2 io-github-autotest-qemu]#  /usr/libexec/qemu-kvm -machine s390-ccw-virtio,? | grep -i loadparm

2. man qemu-kvm and search for loadparm




Actual results:
1. [root@kernelqe2 io-github-autotest-qemu]# 
2. Patter not found in qemu-kvm manpage

Expected results:
there should be related information in return messages

Additional info:

Patch suggested here:
https://lore.kernel.org/qemu-devel/20221114132502.110213-1-thuth@redhat.com/

The output of "-machine s390-ccw-virtio,help" will be fixed with this patch here:
https://gitlab.com/qemu-project/qemu/-/commit/1fd396e32288bbf536483c74b68cb3ee86005a9f

Patch has been merged upstream:

https://gitlab.com/qemu-project/qemu/-/commit/be5df2edb5d69ff3107c5616aa

... we'll get this in RHEL9 with the rebase of qemu-kvm to version 7.2.0, so I'm setting the status to POST now.

Test environment:
qemu-kvm-7.2.0-2.el9.s390x

Test result:
/usr/libexec/qemu-kvm -machine s390-ccw-virtio,? | grep -i loadparm
  loadparm=<loadparm>    - Up to 8 chars in set of [A-Za-z0-9. ] (lower case chars converted to upper case) to pass to machine loader, boot manager, and guest kernel

set verified to this bz

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: qemu-kvm security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:2162