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qemu-img
create image
qemu-img create -f qcow2 ubuntu.qcow2 200G
resize
qemu-img resize ubuntu.qcow2 + 200G
qmp monitor
-chardev socket,id=monitor0,server,path=write-qemu/monitor-debug.sock,nowait \ -mon monitor0,mode=control \
serial console
-chardev ringbuf,id=ringBufSerial0,size=8388608 \ -device isa-serial,chardev=ringBufSerial0 \ read serial console