Now it works:

# virsh list
 Id     Name                         State
----------------------------------------------
 0      Domain-0                     running
 2      openQA_hyperv_intermediary   running
 3354   openQA-SUT-2                 running
 3355   openQA-SUT-8                 running
 3356   openQA-SUT-3                 running
 3357   openQA-SUT-5                 running
 3358   openQA-SUT-7                 running
 3359   openQA-SUT-6                 running
 3360   openQA-SUT-4                 running

# systemctl status libvirtd.service
● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2022-11-14 05:13:07 CET; 1min 42s ago
     Docs: man:libvirtd(8)
           https://libvirt.org
 Main PID: 3811 (libvirtd)
    Tasks: 149 (limit: 32768)
   CGroup: /system.slice/libvirtd.service
           ├─3811 /usr/sbin/libvirtd --timeout 120
           ├─5561 /usr/bin/qemu-system-i386 -xen-domid 3354 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3354,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3354,server,nowai>
           ├─5567 /usr/bin/qemu-system-i386 -xen-domid 3355 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3355,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3355,server,nowai>
           ├─5590 /usr/bin/qemu-system-i386 -xen-domid 3356 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3356,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3356,server,nowai>
           ├─5606 /usr/bin/qemu-system-i386 -xen-domid 3357 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3357,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3357,server,nowai>
           ├─5618 /usr/bin/qemu-system-i386 -xen-domid 3358 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3358,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3358,server,nowai>
           ├─5638 /usr/bin/qemu-system-i386 -xen-domid 3359 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3359,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3359,server,nowai>
           └─5654 /usr/bin/qemu-system-i386 -xen-domid 3360 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3360,server,nowait -no-shutdown -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3360,server,nowai>

Nov 14 05:13:17 openqaw5-xen ovs-vsctl[6086]: ovs|00001|vsctl|INFO|Called as ovs-vsctl --timeout=30 -- --if-exists del-port vif3360.0 -- add-port br0 vif3360.0 -- set interface vif3360.0 "external-ids:\"xen-vm-name\"=\"openQA-SUT-4\"" -- set interface vif3360.0 "extern>
Nov 14 05:13:17 openqaw5-xen root[6111]: /etc/xen/scripts/vif-openvswitch: Successful vif-openvswitch online for vif3355.0.
Nov 14 05:13:17 openqaw5-xen root[6145]: /etc/xen/scripts/vif-openvswitch: Successful vif-openvswitch online for vif3360.0.
Nov 14 05:13:17 openqaw5-xen root[6150]: /etc/xen/scripts/vif-openvswitch: Writing backend/vif/3360/0/hotplug-status connected to xenstore.
Nov 14 05:13:17 openqaw5-xen root[6191]: /etc/xen/scripts/vif-openvswitch: Successful vif-openvswitch online for vif3358.0.
Nov 14 05:13:17 openqaw5-xen root[6196]: /etc/xen/scripts/vif-openvswitch: Writing backend/vif/3358/0/hotplug-status connected to xenstore.
Nov 14 05:13:17 openqaw5-xen root[6239]: /etc/xen/scripts/vif-openvswitch: Successful vif-openvswitch online for vif3359.0.
Nov 14 05:13:17 openqaw5-xen root[6246]: /etc/xen/scripts/vif-openvswitch: Writing backend/vif/3359/0/hotplug-status connected to xenstore.
Nov 14 05:13:17 openqaw5-xen root[6279]: /etc/xen/scripts/vif-openvswitch: Successful vif-openvswitch online for vif3356.0.
Nov 14 05:13:17 openqaw5-xen root[6291]: /etc/xen/scripts/vif-openvswitch: Writing backend/vif/3356/0/hotplug-status connected to xenstore.

Operation：
Just restarted libvirtd service on server openqaw5-xen.qa.suse.de and virsh command can work again.

Thanks Roy!
But why libvirtd is not active?

systemctl is-enabled libvirtd¶

enabled

Don't know why libvirtd is inactive.
Check log and didn't find useful info.
So restart service firstly.
Fortunately it works.
Will keep an eye on the problem in future.

okurz wrote:

Something to handle within the virtualization team, tools doesn't handle this host

Thanks okurz, next time, update it by myself.