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Description of problem:
Added PS/2 input device to guest is ignored on s390x

Version-Release number of selected component (if applicable):
libvirt-4.5.0-24.3.module+el8.0.0+3748+44021654

How reproducible:
Always


Steps to Reproduce:
1. Add PS/2 device to guest, e.g. <input type='keyboard' bus='ps2'/>
2. Start guest

Actual results:
Starts successfully, device not available.

Expected results:
Configuration error displayed.

I've suggested a patch for this problem here:
https://www.redhat.com/archives/libvir-list/2020-January/msg00676.html

I've pushed the patch upstream:

e7a65484ba qemu: Refuse to use "ps2" on machines that do not have this bus

v6.0.0-76-ge7a65484ba

Moving to POST per comment 2.

Verfied https://bugzilla.redhat.com/show_bug.cgi?id=1845055#c4

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: virt:rhel and virt-devel:rhel 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-2020:4676