1.Create data image
qemu-img create -f qcow2 /home/kvm_autotest_root/images/storage0.qcow2 10G

2.Boot VM
 /usr/libexec/qemu-kvm \
     -name 'avocado-vt-vm1'  \
     -machine q35,memory-backend=mem-machine_mem \
     -device '{"id": "pcie-root-port-0", "driver": "pcie-root-port", "multifunction": true, "bus": "pcie.0", "addr": "0x1", "chassis": 1}' \
     -device '{"id": "pcie-pci-bridge-0", "driver": "pcie-pci-bridge", "addr": "0x0", "bus": "pcie-root-port-0"}'  \
     -nodefaults \
     -device '{"driver": "VGA", "bus": "pcie.0", "addr": "0x2"}' \
     -m 12G \
     -object '{"size": 12884901888, "id": "mem-machine_mem", "qom-type": "memory-backend-ram"}'  \
     -smp 56,maxcpus=56,cores=28,threads=1,dies=1,sockets=2  \
     -cpu 'Icelake-Server-noTSX',+kvm_pv_unhalt \
     -device '{"id": "pcie-root-port-1", "port": 1, "driver": "pcie-root-port", "addr": "0x1.0x1", "bus": "pcie.0", "chassis": 2}' \
     -device '{"driver": "qemu-xhci", "id": "usb1", "bus": "pcie-root-port-1", "addr": "0x0"}' \
     -device '{"driver": "usb-tablet", "id": "usb-tablet1", "bus": "usb1.0", "port": "1"}' \
     -object '{"qom-type": "iothread", "id": "iothread0"}' \
     \
     -blockdev '{"node-name": "file_image1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "native", "filename": "/home/kvm_autotest_root/images/rhel950-64-virtio.qcow2", "cache": {"direct": true, "no-flush": false}}' \
     -blockdev '{"node-name": "drive_image1", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_image1"}' \
     -device '{"id": "pcie-root-port-2", "port": 2, "driver": "pcie-root-port", "addr": "0x1.0x2", "bus": "pcie.0", "chassis": 3}' \
     -device '{"driver": "virtio-blk-pci", "id": "image1", "drive": "drive_image1", "bootindex": 0, "write-cache": "on", "iothread-vq-mapping": [{"iothread": "iothread0"}], "bus": "pcie-root-port-2", "addr": "0x0"}' \
     \
     -device '{"id": "pcie_extra_root_port_0", "driver": "pcie-root-port", "multifunction": true, "bus": "pcie.0", "addr": "0x3", "chassis": 5}' \
    \
     -device '{"id": "pcie-root-port-3", "port": 3, "driver": "pcie-root-port", "addr": "0x1.0x3", "bus": "pcie.0", "chassis": 4}' \
     -device '{"driver": "virtio-net-pci", "mac": "9a:5f:37:63:a3:f7", "id": "idbuqpiH", "netdev": "idoDIRtd", "bus": "pcie-root-port-3", "addr": "0x0"}' \
     -netdev  '{"id": "idoDIRtd", "type": "tap", "vhost": true}'  \
     -rtc base=utc,clock=host,driftfix=slew  \
     -boot menu=off,order=cdn,once=c,strict=off \
     -enable-kvm \
     \
     -vnc :5 \
     -monitor stdio \
     -qmp tcp:0:5955,server=on,wait=off \
     -boot menu=on,reboot-timeout=1000,strict=off \
     \

3.hotplug disk with iothread-vq-mapping enable
{"execute": "blockdev-add", "arguments": {"node-name": "file_stg0", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "native", "filename": "/home/kvm_autotest_root/images/storage0.qcow2", "cache": {"direct": true, "no-flush": false}}, "id": "qxJYFuAs"}
{"return": {}, "id": "qxJYFuAs"}

{"execute": "blockdev-add", "arguments": {"node-name": "drive_stg0", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_stg0"}, "id": "o18irOsK"}
{"return": {}, "id": "o18irOsK"}

{"execute": "device_add", "arguments": {"driver": "virtio-blk-pci", "id": "stg0", "drive": "drive_stg0", "write-cache": "on", "serial": "TARGET_DISK0", "iothread-vq-mapping": [{"iothread": "iothread0"}], "bus": "pcie_extra_root_port_0", "addr": "0x0"}, "id": "8WvXBa4Q"}
{"return": {}, "id": "8WvXBa4Q"}


4. block_resize on new hotplugged disk
{"execute": "block_resize", "arguments": {"node-name": "drive_stg0", "size": 16106127360}}