Error: Deprecated CPU topology (considered invalid): Unsupported cluster parameter musn't be specified as 1

Host environment

• Operating system: OpenSuse Tumbleweed
• OS/kernel version: 6.9.7-1
• Architecture: x86
• QEMU flavor: qemu-system-x86_64
• QEMU version: 9.0.0
• QEMU command line:

2024-07-02T19:10:42.258538Z qemu-system-x86_64: warning: Deprecated CPU topology (considered invalid): Unsupported clusters parameter mustn't be specified as 1 (Thats I guess the relevant part/error. The whole command line has been generated via virt-manager and is 10 meters long)

Emulated/Virtualized environment

• Operating system: Windows 11
• OS/kernel version: --
• Architecture: x86

Description of problem

warning: Deprecated CPU topology (considered invalid): Unsupported clusters parameter mustn't be specified as 1 VM does not start

What I've tried so far to fix:

• Removed the offending clusters="1" parameter in the XML, both via virsh edit and virt-manager but the sucker comes back every time!

• Creating a completely new VM from scratch, just keeping the qcow2 for Windows. What happens then is funny: The initial setup goes well. Machine type automatically gets set to q35 version 9.0. After setting up my cores (pinning) for the VM (7C/14T for the VM 1C/2T for host), there is no "clusters" parameter anymore. So the first start went well. After a RESTART of the whole host machine and subsequent launch of the VM guess what happened? The "clusters" thing is back in full swing.

Steps to reproduce

1. Create Windows 11 VM with virt-manager
2. Try to do core pinning and setting up the following in virt manager before

• Copy CPU configuration from host (host-passthrough)
• Manually set CPU structure via GUI to 1 Socket, 7 Cores, 2 Threads on an 8 Core (in my case 11900k)

3. Observe result in XML being: <topology sockets="1" dies="1" clusters="1" cores="7" threads="2"/>

Again, the "clusters" entry leads to the VM not starting. Removing it doesn't work, it comes back straight away. I tried in virt-manager as well as with virsh edit.

Additional information

My core pinning for reference:

<vcpu placement="static">14</vcpu>
  <iothreads>1</iothreads>
  <cputune>
    <vcpupin vcpu="0" cpuset="0"/>
    <vcpupin vcpu="1" cpuset="8"/>
    <vcpupin vcpu="2" cpuset="1"/>
    <vcpupin vcpu="3" cpuset="9"/>
    <vcpupin vcpu="4" cpuset="2"/>
    <vcpupin vcpu="5" cpuset="10"/>
    <vcpupin vcpu="6" cpuset="3"/>
    <vcpupin vcpu="7" cpuset="11"/>
    <vcpupin vcpu="8" cpuset="4"/>
    <vcpupin vcpu="9" cpuset="12"/>
    <vcpupin vcpu="10" cpuset="5"/>
    <vcpupin vcpu="11" cpuset="13"/>
    <vcpupin vcpu="12" cpuset="6"/>
    <vcpupin vcpu="13" cpuset="14"/>
    <emulatorpin cpuset="7,15"/>
    <iothreadpin iothread="1" cpuset="7,15"/>
  </cputune>