Description of problem:
there is no hot-plugged disk after execute hot-plug action in qmp.

Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux release 9.0Beta (Plow)
5.14.0-1.el9.x86_64
qemu-kvm-6.1.0-2.el9.x86_64
seabios-bin-1.14.0-6.el9.noarch
edk2-ovmf-20210527gite1999b264f1f-6.el9.noarch


How reproducible:
100%

Steps to Reproduce:
1.boot vm
/usr/libexec/qemu-kvm \
    -name 'avocado-vt-vm1'  \
    -sandbox on  \
    -blockdev node-name=file_ovmf_code,driver=file,filename=/usr/share/OVMF/OVMF_CODE.secboot.fd,auto-read-only=on,discard=unmap \
    -blockdev node-name=drive_ovmf_code,driver=raw,read-only=on,file=file_ovmf_code \
    -blockdev node-name=file_ovmf_vars,driver=file,filename=/home/kvm_autotest_root/images/avocado-vt-vm1_rhel850-64-virtio.qcow2_VARS.fd,auto-read-only=on,discard=unmap \
    -blockdev node-name=drive_ovmf_vars,driver=raw,read-only=off,file=file_ovmf_vars \
    -machine q35,memory-backend=mem-machine_mem,pflash0=drive_ovmf_code,pflash1=drive_ovmf_vars \
    -device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
    -device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0  \
    -nodefaults \
    -device VGA,bus=pcie.0,addr=0x2 \
    -m 8g \
    -object memory-backend-ram,size=8G,id=mem-machine_mem  \
    -smp 12,maxcpus=12,cores=6,threads=1,dies=1,sockets=2  \
    -cpu 'Haswell-noTSX',+kvm_pv_unhalt \
    -device pcie-root-port,id=pcie-root-port-1,port=0x1,addr=0x1.0x1,bus=pcie.0,chassis=2 \
    -device qemu-xhci,id=usb1,bus=pcie-root-port-1,addr=0x0 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
    -blockdev node-name=file_image1,driver=file,auto-read-only=on,discard=unmap,aio=threads,filename=/home/kvm_autotest_root/images/rhel850-64-virtio-ovmf.qcow2,cache.direct=on,cache.no-flush=off \
    -blockdev node-name=drive_image1,driver=qcow2,read-only=off,cache.direct=on,cache.no-flush=off,file=file_image1 \
    -device pcie-root-port,id=pcie-root-port-2,port=0x2,addr=0x1.0x2,bus=pcie.0,chassis=3 \
    -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=0,write-cache=on,bus=pcie-root-port-2,addr=0x0 \
    -device pcie-root-port,id=pcie-root-port-3,port=0x3,addr=0x1.0x3,bus=pcie.0,chassis=4 \
    -device virtio-net-pci,mac=9a:1b:4e:74:10:e6,id=idIQPPEw,netdev=idANAOp6,bus=pcie-root-port-3,addr=0x0  \
    -netdev tap,id=idANAOp6,vhost=on  \
    -vnc :5 \
  -qmp tcp:0:5955,server,nowait \
  -monitor stdio \
    -rtc base=utc,clock=host,driftfix=slew  \
    -boot menu=off,order=cdn,once=c,strict=off \
    -enable-kvm \
    -device pcie-root-port,id=pcie_extra_root_port_0,multifunction=on,bus=pcie.0,addr=0x3,chassis=5


2. hotplug disk
qemu-img create -f qcow2 /home/kvm_autotest_root/images/storage0.qcow2 1G

{"execute": "qmp_capabilities", "id": "RRgekEIw"}
{"execute": "blockdev-add", "arguments": {"node-name": "file_stg0", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/storage0.qcow2", "cache": {"direct": true, "no-flush": false}}, "id": "WECzE2mI"}
{"execute": "blockdev-add", "arguments": {"node-name": "drive_stg0", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_stg0"}, "id": "jD3uXHy5"}
{"execute": "device_add", "arguments": {"driver": "virtio-blk-pci", "id": "stg0", "drive": "drive_stg0", "write-cache": "on", "bus": "pcie_extra_root_port_0", "addr": "0x0"}, "id": "TIH2qZu5"}

3.check disk in guest
lsblk

Actual results:
No new disk present in guest

Expected results:
New disk present in guest

Additional info:

No issue on:
Red Hat Enterprise Linux release 8.5 Beta (Ootpa)
4.18.0-339.el8.x86_64
qemu-kvm-6.0.0-30.module+el8.5.0+12586+476da3e1.x86_64
seabios-bin-1.14.0-1.module+el8.4.0+8855+a9e237a9.noarch
edk2-ovmf-20210527gite1999b264f1f-3.el8.noarch


Automation:
python ConfigTest.py --testcase=block_hotplug.block_virtio.fmt_qcow2.default.with_plug.default.one_pci --guestname=RHEL.8.5.0 --driveformat=virtio_blk --machine=q35 --firmware=ovmf --clone=no