[问题咨询]: 编译好的qemu-x86_64-linux-min、qemu-arm-linux-min、qemu-arm64-linux-min启动后ifconfig没有eth0网卡，只有lo本地回环

### 问题描述

运行qemu_run.sh -n 启动后ifconfig没有eth0网卡，只有lo本地回环网卡，无法与宿主机通信，无法将qemu内部的端口映射转发到外部
启动脚本：

```
qemu-system-aarch64 \
	-M virt -smp 4 \
	-m 1024 \
	-nographic \
	-cpu cortex-a57 \
	-netdev user,id=net0,hostfwd=tcp::8080-:8080 \
        -device virtio-net-pci,netdev=net0,mac=12:22:33:44:55:66 \
	-drive if=none,file=/mnt/root/out-all/images-arm64/userdata.img,format=raw,id=userdata,index=3 -device virtio-blk-device,drive=userdata \
	-drive if=none,file=/mnt/root/out-all/images-arm64/vendor.img,format=raw,id=vendor,index=2 -device virtio-blk-device,drive=vendor \
	-drive if=none,file=/mnt/root/out-all/images-arm64/system.img,format=raw,id=system,index=1 -device virtio-blk-device,drive=system \
	-drive if=none,file=/mnt/root/out-all/images-arm64/updater.img,format=raw,id=updater,index=0 -device virtio-blk-device,drive=updater \
	-kernel /mnt/root/out-all/images-arm64/Image \
	-initrd /mnt/root/out-all/images-arm64/ramdisk.img \
	-append 'console=ttyAMA0 init=/bin/init hardware=qemu.arm.linux root=/dev/ram0 rw ohos.required_mount.system=/dev/block/vdb@/usr@ext4@ro,barrier=1@wait,required ohos.required_mount.vendor=/dev/block/vdc@/vendor@ext4@ro,barrier=1@wait,required sn=0023456789'
```

```
# ifconfig
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0 
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:0 TX bytes:0

# ifconfig -a
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
HiLogAdapter_init: Can't connect to server. Errno: 2
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0 
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:0 TX bytes:0

eth0      Link encap:Ethernet  HWaddr 12:22:33:44:55:66  Driver virtio_net
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:0 TX bytes:0

```
执行ifconfig -a可以看到有网卡，需要手动启用网卡并配置ip才能通信，如何在启动的时候自动激活网卡并配置IP？

```
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0 
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:0 TX bytes:0

eth0      Link encap:Ethernet  HWaddr 12:22:33:44:55:66  Driver virtio_net
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0 
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:64 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:58 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:3473 TX bytes:5696

```
另外，x86_64的microvm架构不支持pci，只有sit0网卡，没有eth0，如何实现user模式将端口映射到外部的功能？

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