Description of problem:
[blockdev enablement] Set blockcopy bandwidth failed with 'virsh blockjob'

Version-Release number of selected component (if applicable):
libvirt-5.10.0-1.module+el8.2.0+5040+bd433686.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Having a running vm
# virsh domblklist avocado-vt-vm1
...
----------------------------------------------------------------------
 vda    /var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2

2. Do blockcopy
# virsh blockcopy avocado-vt-vm1 vda /tmp/copy.img --transient-job --reuse-external
Block Copy started


3.Try to set the job's bandwidth with BYTES or BANDWIDTH
# virsh blockjob avocado-vt-vm1 vda --bytes 2
error: Requested operation is not valid: No active block job 'drive-virtio-disk0'

# virsh blockjob avocado-vt-vm1 vda --bandwidth 1
error: Requested operation is not valid: No active block job 'drive-virtio-disk0'


Actual results:
setting bandwidth failed 

Expected results:
Succesful

Additional info:
qemu process as follow:
/usr/libexec/qemu-kvm -name guest=avocado-vt-vm1,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-9-avocado-vt-vm1/master-key.aes -machine pc-q35-rhel8.1.0,accel=kvm,usb=off,dump-guest-core=off -cpu Skylake-Server-IBRS,ss=on,hypervisor=on,tsc-adjust=on,clflushopt=on,umip=on,pku=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,ibpb=on,amd-ssbd=on,skip-l1dfl-vmentry=on,vmx=off -m 1024 -overcommit mem-lock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 9f672c02-487d-45df-965f-49b2870dd948 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=38,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 -device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 -device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 -device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 -device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 -blockdev {"driver":"file","filename":"/var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null} -device virtio-blk-pci,scsi=off,bus=pcie.0,addr=0x5,drive=libvirt-1-format,id=virtio-disk0,bootindex=1 -netdev tap,fd=40,id=hostnet0,vhost=on,vhostfd=41 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:ba:73:b3,bus=pci.1,addr=0x0 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,fd=42,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 127.0.0.1:1 -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1 -device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 -object rng-random,id=objrng0,filename=/dev/urandom -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.6,addr=0x0 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on