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Description of problem:

"virsh cpu-baseline" is currently not implemented.

Steps to Reproduce:
1. Create example.txt with

<cpu>
        <arch>s390x</arch>
        <model>z13-base</model>
</cpu>

2. virsh cpu-baseline example.xml

Actual results:

"error: this function is not supported by the connection driver: cannot compute baseline CPU of s390x architecture"

Expected results:

A baselined CPU model in XML format.

Additional info:

For s390x, we have to baseline using qemu via qmp "query-cpu-model-baseline" to obtain the result. The QEMU part is already implemented. We can baseline two models at a time. Therefore, to baseline N CPU models, we need "N - 1" qmp queries.

*** This bug has been marked as a duplicate of bug 1660904 ***