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Description of problem:
When adding an input device without bus, libvirt currently tries to assign it to an usb bus which does not exist on s390x. libvirt should put it on the virtio bus on s390x instead.

Version-Release number of selected component (if applicable):
libvirt-4.5.0-36.module+el8.2.0+4817+92ef2d83.s390x

How reproducible:
100%

Steps to Reproduce:
1. virsh edit guestname
2. Add this tag (without bus):
   <input type='keyboard'/>

Actual results:
error: unsupported configuration: USB is disabled for this domain, but USB devices are present in the domain XML

Expected results:
An input type='keyboard' device gets added successfully with bus='virtio'.

Reproduced with
libvirt-4.5.0-37.module+el8.2.0+5221+0a85e35d.s390x

Steps
1. virsh edit guestname
2. Add this tag (without bus):
   <input type='keyboard'/>

Results:
error: unsupported configuration: USB is disabled for this domain, but USB devices are present in the domain XML
Failed. Try again? [y,n,i,f,?]:

Pushed upstream as:

177fbcdfaa domain_conf: Do not use USB by default for <input> devices on s390x

v6.0.0-rc1-15-g177fbcdfaa

Moving to POST per comment 2.

Verified with:
libvirt-6.0.0-17.module+el8.3.0+6423+e4cb6418.s390x

Steps
1. virsh edit guestname
2. Add this tag (without bus):
   <input type='keyboard'/>
3. virsh dumpxml|grep keyboard
==>
    <input type='keyboard' bus='virtio'>

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