Version-Release number of selected component (if applicable):
libvirt libvirt-10.0.0-1.el9.x86_64
qemu-kvm qemu-kvm-8.2.0-3.el9.x86_64
kernel kernel-5.14.0-410.el9.x86_64
 
How reproducible:
100%
 
Steps to Reproduce:
1. prepare a guest 
(.libvirt-ci-venv-ci-runtest-IUivsI) [root@xx libvirt-ci-latest-venv]# virsh dumpxml avocado-vt-vm1 --xpath //disk
<disk type="file" device="disk">
  <driver name="qemu" type="qcow2"/>
  <source file="/var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2"/>
  <target dev="vda" bus="virtio"/>
  <address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</disk>
 
 
2. start this guest
(.libvirt-ci-venv-ci-runtest-IUivsI) [root@xx libvirt-ci-latest-venv]# virsh start avocado-vt-vm1
Domain 'avocado-vt-vm1' started
 
(.libvirt-ci-venv-ci-runtest-IUivsI) [root@xx libvirt-ci-latest-venv]# virsh list
 Id   Name             State
--------------------------------
 1    avocado-vt-vm1   running
 
 
3. Configure guest disk iotune values :
 
(.libvirt-ci-venv-ci-runtest-IUivsI) [root@xx libvirt-ci-latest-venv]# !90
virsh blkdeviotune avocado-vt-vm1 --device vda --total-iops-sec 6000 --total-iops-sec-max 11000 --total-bytes-sec 5000 --total-bytes-sec-max 10000 --group-name libvirt_iotune_group1
 
(.libvirt-ci-venv-ci-runtest-IUivsI) [root@xx libvirt-ci-latest-venv]# virsh dumpxml avocado-vt-vm1 --xpath //disk
<disk type="file" device="disk">
  <driver name="qemu" type="qcow2"/>
  <source file="/var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2" index="1"/>
  <backingStore/>
  <target dev="vda" bus="virtio"/>
  <iotune>
    <total_bytes_sec>5000</total_bytes_sec>
    <total_iops_sec>6000</total_iops_sec>
    <total_bytes_sec_max>10000</total_bytes_sec_max>
    <total_iops_sec_max>11000</total_iops_sec_max>
    <group_name>libvirt_iotune_group1</group_name>
  </iotune>
  <alias name="virtio-disk0"/>
  <address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</disk>
 
4. Get guest disk iotune values: 
(.libvirt-ci-venv-ci-runtest-IUivsI) [root@dell-per730-67 libvirt-ci-latest-venv]# virsh blkdeviotune avocado-vt-vm1 --device vda
error: Unable to get number of block I/O throttle parameters
error: An error occurred, but the cause is unknown
 
 
 
 
Expected result:
iotune values can be queried from virsh blkdeviotune
 
Actual result:
 
Unable to get number of block I/O throttle parameters