What were you trying to do that didn't work?

Set a link of an VM interface down.

Please provide the package NVR for which bug is seen:

libvirt-10.0.0-3.el10+5
qemu-kvm-9.0.0-1.el10
guest kernel: kernel-6.9.0-7.el10.s390x

How reproducible:

100%

Steps to reproduce

1. Start a VM with an interface, I used the standard libvirt network interface

   [root@rdu-z16-l2a ~]# virsh dumpxml avocado-vt-vm1 --xpath //interface
   <interface type="network">
     <mac address="52:54:00:f8:d1:21"/>
     <source network="default" portid="de6bb0de-95c4-4cf3-8a37-68b9701b210d" bridge="virbr0"/>
     <target dev="vnet0"/>
     <model type="virtio"/>
     <alias name="net0"/>
     <address type="ccw" cssid="0xfe" ssid="0x0" devno="0x0001"/>
   </interface>
   

1. set the link down, I used virsh but I'll attach virtqemud logs that show which commands where issued

   # virsh domif-setlink vm 52:54:00:f8:d1:21 down

Expected results

After a couple of seconds (automated test waits up to 5 secs), inside the VM, ip link confirms that the IF is down, e.g.:

enc1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000

Actual results

Even after 1min the link remains up

enc1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000

Additional information

1. setting component qemu-kvm because the virtqemud logs confirmed the command was issued and returned successfully:

   2024-06-04 11:48:59.522+0000: 382054: info : qemuMonitorSend:860 : QEMU_MONITOR_SEND_MSG: mon=0x3ff70040d40 msg={"execute":"set_link","arguments":{"name":"net0","up":false},"id":"libvirt-15"}^M
    fd=-1
   2024-06-04 11:48:59.522+0000: 382370: info : qemuMonitorIOWrite:362 : QEMU_MONITOR_IO_WRITE: mon=0x3ff70040d40 buf={"execute":"set_link","arguments":{"name":"net0","up":false},"id":"libvirt-15"}^M
    len=81 ret=81 errno=0
   2024-06-04 11:48:59.523+0000: 382370: debug : qemuMonitorJSONIOProcessLine:191 : Line [{"return": {}, "id": "libvirt-15"}]
   2024-06-04 11:48:59.523+0000: 382370: info : qemuMonitorJSONIOProcessLine:210 : QEMU_MONITOR_RECV_REPLY: mon=0x3ff70040d40 reply={"return": {}, "id": "libvirt-15"}