CPU热插拔

$ ./stratovirt \
    -machine q35 \
    -smp [cpus=]<n>,maxcpus=<max_cpus> \
    -m 512 \
    -kernel path/to/kernel \
    -append "console=ttyS0 root=/dev/vda reboot=k panic=1" \
    -drive file=path/to/OVMF_CODE.fd,if=pflash,unit=0,readonly=true \
    -device pcie-root-port,port=0x0,addr=0x1.0x0,bus=pcie.0,id=pcie.1 \
    -drive file=path/to/rootfs,id=rootfs,readonly=true \
    -device virtio-blk-pci,drive=rootfs,bus=pcie.1,addr=0x0.0x0,id=blk-0 \
    -qmp unix:path/to/api/socket,server,nowait \
    -serial stdio

$ ncat -U /path/to/api/socket
{"QMP":{"version":{"qemu":{"micro":1,"minor":0,"major":5},"package":"StratoVirt-2.4.0"},"capabilities":[]}}
-> {"execute": "device_add","arguments": { "id": "device-id", "driver": "generic-x86-cpu", "cpu-id": cpuid }}
<- {"return":{}}
<- {"event":"CPU_RESIZE","data":{},"timestamp":{"seconds":seconds, "microseconds":microseconds}}

$ ncat -U /path/to/api/socket
{"QMP":{"version":{"qemu":{"micro":1,"minor":0,"major":5},"package":"StratoVirt-2.4.0"},"capabilities":[]}}
-> {"execute": "device_del", "arguments": { "id": "device-id"}}
<- {"return":{}}
<- {"event":"CPU_RESIZE","data":{},"timestamp":{"seconds":seconds, "microseconds":microseconds}}