「-serial mon:stdio」を付けてやるだけ
qemu-system-x86_64 --enable-kvm \ -smp 2 \ -m 1G \ -nodefaults \ -no-user-config \ -vga cirrus \ -name VM1 \ -object memory-backend-file,id=mem0,size=1G,mem-path=/dev/hugepages,share=on \ -numa node,memdev=mem0 \ -boot strict=on \ -drive file=/var/lib/libvirt/images/TESTVM.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 \ -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \ -vnc 0.0.0.0:10 \ -machine pc-i440fx-2.0,accel=kvm,usb=off \ -netdev bridge,br=br0,id=net0 \ -device e1000,netdev=net0,mac=52:54:00:12:10:11 \ -chardev socket,id=qmp,port=4444,host=192.168.122.1,server,nowait \ -mon chardev=qmp,mode=control,pretty=on \ -chardev socket,id=spdk_vhost_blk0,path=/var/tmp/vhost.0 \ -device vhost-user-blk-pci,id=blk0,chardev=spdk_vhost_blk0 \ -nographic -serial mon:stdio