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Description of problem:
As subject

Version-Release number of selected component (if applicable):
qemu-kvm-7.0.0-8.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
Setting the properties thread-pool-max/thread-pool-min of iothread objects are supported since BZ2031024.  
However, getting thread-pool-max/thread-pool-min by query-iothreads is not supported yet.  
No thread-pool-max/thread-pool-min properties in the result object IOThreadInfo for query-iothreads QMP, see https://gitlab.com/qemu-project/qemu/-/blob/master/qapi/misc.json#L72

Actual results:
As above

Expected results:
Support to get thread-pool-max/thread-pool-min by query-iothreads

Additional info:

The libvirt bug 2104407 has been closed, close the QEMU one too.

For the record, in case anyone stumbles across this bug report who needs the same functionality: This value can already be queried with the qom-get QMP command. Adding the information to query-iothreads would be more convenient, but is not a hard requirement for retrieving the value.

$ build/qemu-system-x86_64 -object iothread,id=t0 -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 50, "minor": 0, "major": 7}, "package": "v7.0.0-2105-g2e177f879b"}, "capabilities": ["oob"]}}
{"execute":"qmp_capabilities"}
{"return": {}}
{"execute":"qom-get","arguments":{"path":"/objects/t0","property":"thread-pool-max"}}
{"return": 64}