There is a watchdog device be set as default since RHEL9.3. When I try to add another warchdog to the vm. Both two watchdog did not power off the vm as I configed.

qemu-img-8.2.0-11.el9_4.x86_64
ipxe-roms-qemu-20200823-9.git4bd064de.el9.noarch
qemu-kvm-common-8.2.0-11.el9_4.x86_64
qemu-kvm-device-display-virtio-gpu-8.2.0-11.el9_4.x86_64
libvirt-libs-10.0.0-6.2.el9_4.x86_64
libvirt-client-10.0.0-6.2.el9_4.x86_64
libvirt-daemon-common-10.0.0-6.2.el9_4.x86_64
libvirt-daemon-log-10.0.0-6.2.el9_4.x86_64
libvirt-daemon-driver-qemu-10.0.0-6.2.el9_4.x86_64
qemu-kvm-core-8.2.0-11.el9_4.x86_64
qemu-kvm-device-display-virtio-gpu-pci-8.2.0-11.el9_4.x86_64
qemu-kvm-device-usb-redirect-8.2.0-11.el9_4.x86_64

100%

1.Install a vm on cnv with watchdog device:
       devices:
          watchdog:
            name: watchdog
            i6300esb:
              action: "poweroff" 

   <watchdog model='i6300esb' action='poweroff'>
      <alias name='ua-watchdog'/>
      <address type='pci' domain='0x0000' bus='0x0c' slot='0x01' function='0x0'/>
    </watchdog>
    <watchdog model='itco' action='poweroff'>
      <alias name='watchdog1'/>
    </watchdog>

2. install watchdog and trigger it by running echo 1 > /dev/watchdog

3. check event for the vm

   virsh event --all --loop
Authorization not available. Check if polkit service is running or see debug message for more information.
event 'watchdog' for domain 'default_rhel9-amaranth-gecko-70': poweroff
event 'lifecycle' for domain 'default_rhel9-amaranth-gecko-70': Stopped Failed
event 'lifecycle' for domain 'default_rhel9-amaranth-gecko-70': Undefined Removed
error: Disconnected from qemu:///session due to end of file
events received: 3
error: internal error: client socket is closed

4. check the status for the vm
  oc get vm
NAME                       AGE   STATUS    READY
rhel9-amaranth-gecko-70    68m   Running   True

the vm will reboot in 1 min

the vm poweroff in 1 min

The itco watchdog was set by default since rhel9.3, it can not be removed. there might be something unexpected with it