X86_64平台通过QEMU部署ARM架构虚拟机

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有些场景下需要使用ARM环境，于是学习下在没有预算或者没有ARM硬件的条件下如何在X86_64平台通过QEMU部署ARM架构虚拟机。

环境准备

这里使用了一台8C 12G Vmware虚拟机，环境是Ubuntu 2204桌面版。

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Disk /dev/sda: 60 GiB, 64424509440 bytes, 125829120 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: ED38AC2F-DD48-409F-BC6C-D18D05E08D9A

Device       Start       End   Sectors  Size Type
/dev/sda1     2048      4095      2048    1M BIOS boot
/dev/sda2     4096   1054719   1050624  513M EFI System
/dev/sda3  1054720 125827071 124772352 59.5G Linux filesystem

桌面版默认使用NetworkManager管理网络，但因为后续有一些网络配置，这里禁用NetworkManager。

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systemctl status NetworkManager
systemctl stop NetworkManager
systemctl disable NetworkManager

进入/etc/netplan，编辑yaml配置网络信息，类似如下：

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root@develop:/etc/netplan# cat 00-installer-config.yaml 
network:
  version: 2
  renderer: networkd
  ethernets:
    ens33:
      addresses:
        - 192.168.0.220/24
      nameservers:
        addresses: [8.8.8.8]
      routes:
        - to: default
          via: 192.168.0.1

键入netplan apply后配置生效。

启用systemd-networkd管理网络：

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systemctl status systemd-networkd
systemctl start systemd-networkd
systemctl enable systemd-networkd

安装基本工具和qemu相关组件：

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apt install openssh-server net-tools vim -y

apt install qemu qemu-kvm qemu-system-arm bridge-utils uml-utilities qemu-efi-aarch64 cloud-image-utils -y

root@develop:/# qemu-img -V
qemu-img version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.18)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

创建armspace目录后，通过qemu-img创建一个ubuntu2204_arm64.img文件，格式为raw：

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mkdir /armspace && cd /armspace/

root@develop:/armspace# qemu-img create ubuntu2204_arm64.img 30G
Formatting 'ubuntu2204_arm64.img', fmt=raw size=32212254720

下载UEFI固件和ubuntu-22.04.4-live-server-arm64.iso文件放在armspace目录：

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wget https://releases.linaro.org/components/kernel/uefi-linaro/16.02/release/qemu64/QEMU_EFI.fd

wget https://mirrors.tuna.tsinghua.edu.cn/ubuntu-releases/22.04.4/ubuntu-22.04.4-live-server-amd64.iso

root@develop:/armspace# ls -lrt
total 1986756
-rw-r--r-- 1 root    root        2097152  1月 13  2018 QEMU_EFI.fd
-rw-r--r-- 1 develop develop  2032332800  2月 20 08:52 ubuntu-22.04.4-live-server-arm64.iso
-rw-r--r-- 1 root    root    32212254720  4月 14 23:12 ubuntu2204_arm64.img

QEMU创建ARM虚拟机

启动安装

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qemu-system-aarch64 -m 4096 -cpu cortex-a57 -smp 4 -M virt -bios QEMU_EFI.fd -nographic -drive if=none,file=ubuntu-22.04.4-live-server-arm64.iso,id=cdrom,media=cdrom -device virtio-scsi-device -device scsi-cd,drive=cdrom -drive if=none,file=ubuntu2204_arm64.img,id=hd0 -device virtio-blk-device,drive=hd0

启动后等待ISO加载，过程会比较慢，不要退出或者中断：

等待即可进行正常的文本安装配置流程。但安装过程也会比较长，需要耐心等待，我这里等待了近1个小时。

安装完成后需要unmounting /cdrom，可以通过kill -15关闭QEMU安装进程。

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root@develop:/etc/netplan# ps -ef | grep qemu
root        3881    2358 99 4月14 pts/1   01:30:28 qemu-system-aarch64 -m 4096 -cpu cortex-a57 -smp 4 -M virt -bios QEMU_EFI.fd -nographic -drive if=none,file=ubuntu-22.04.4-live-server-arm64.iso,id=cdrom,media=cdrom -device virtio-scsi-device -device scsi-cd,drive=cdrom -drive if=none,file=ubuntu2204_arm64.img,id=hd0 -device virtio-blk-device,drive=hd0
root        5130    4378  0 00:11 pts/4    00:00:00 grep --color=auto qemu

root@develop:/etc/netplan# kill -15 3881

搭建网桥

1、新创建一个qemu0网桥

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brctl addbr qemu0
brctl show

2、将00-installer-config.yaml通过改名的方式取消配置

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mv 00-installer-config.yaml 00-installer-config.yaml.bak

3、同时新创建01-qemu.yaml配置，配置中qemu0将用到ens33网卡，该配置启用后，qemu0网桥将成为工作网卡，外部主机可以直接SSH访问，具体为如下内容：

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root@develop:/etc/netplan# cat 01-qemu0.yaml 
network:
  version: 2
  renderer: networkd
  ethernets:
    ens33:
      dhcp4: false
      dhcp6: false
  bridges:
    qemu0:
      macaddress: 2e:fa:d5:03:39:c7
      dhcp4: no
      dhcp6: no
      addresses:
        - 192.168.0.220/24
      routes:
        - to: default
          via: 192.168.0.1
      nameservers:
        addresses:
          - 8.8.8.8
      interfaces:
        - ens33

键入netplan apply后可能遇到类似如下警告:

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** (generate:2496): WARNING **: 05:24:24.943: Permissions for /etc/netplan/01-network-manager-all.yaml are too open. Netplan configuration should NOT be accessible by others.

Cannot call openvswitch: ovsdb-server.service is not running.

解决方案：

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chmod 600 /etc/netplan/your_config_file.yaml

apt install openvswitch-switch -y

tun/tap网络设备

Tun/tap设备提供的虚拟网卡驱动，从tcp/ip协议栈的角度而言，它与真实网卡驱动并没有区别。这里需要通过TAP的方式进行网络通信。具体TAP的理解可以查看文末参考部分列出的文章《【云原生虚拟化】一文读懂网络虚拟化之 tun/tap网络设备》。这里先借用文章中的一张图，便于理解。

将tap0和qemu0关联起来：

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ip tuntap add dev tap0 mode tap
ip link set tap0 up
ip link set tap0 master qemu0

上述这几步会在Vmware虚拟机关闭或者重启后失效，如有需要编写脚本进行自动化。qume支持类似如下配置在启动时携带脚本:

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-net nic -net tap,ifname=tap0,script=no,downscript=no

启动虚拟机

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qemu-system-aarch64 -m 4096 -cpu cortex-a57 -smp 4 -M virt -bios QEMU_EFI.fd -nographic -device virtio-scsi-device -drive if=none,file=ubuntu2204_arm64.img,format=raw,index=0,id=hd0 -device virtio-blk-device,drive=hd0 -net nic -net tap,ifname=tap0,script=no,downscript=no

开机后默认会自动获取DHCP IP，通过netplan设置静态IP即可：

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root@develop-qemu-arm:/etc/netplan# cat 00-installer-config.yaml 
# This is the network config written by 'subiquity'
network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s1:
      addresses:
        - 192.168.0.226/24
      nameservers:
        addresses: [8.8.8.8]
      routes:
        - to: default
          via: 192.168.0.1

注：到此处配置完成后，Ubuntu 2204 X86_64的Vmware虚拟机192.168.0.220和QEMU模拟的ARM环境虚拟机192.168.0.226都是可以直接在宿主机192.168.0.106上进行SSH操作的，非常方便。

查看一些系统信息：

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develop@develop-qemu-arm:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           391M  936K  390M   1% /run
/dev/vda2        29G  6.8G   21G  26% /
tmpfs           2.0G     0  2.0G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/vda1       1.1G  6.4M  1.1G   1% /boot/efi
tmpfs           391M  4.0K  391M   1% /run/user/1000

develop@develop-qemu-arm:~$ lscpu
Architecture:            aarch64
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Little Endian
CPU(s):                  4
  On-line CPU(s) list:   0-3
Vendor ID:               ARM
  Model name:            Cortex-A57
    Model:               0
    Thread(s) per core:  1
    Core(s) per cluster: 4
    Socket(s):           -
    Cluster(s):          1
    Stepping:            r1p0
    BogoMIPS:            125.00
    Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
NUMA:                    
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-3
Vulnerabilities:         
  Gather data sampling:  Not affected
  Itlb multihit:         Not affected
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Mmio stale data:       Not affected
  Retbleed:              Not affected
  Spec rstack overflow:  Not affected
  Spec store bypass:     Vulnerable
  Spectre v1:            Mitigation; __user pointer sanitization
  Spectre v2:            Vulnerable
  Srbds:                 Not affected
  Tsx async abort:       Not affected

这里安装一个最新版本的docker后，查看docker版本信息：

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root@develop-qemu-arm:/home/develop# docker version
Client: Docker Engine - Community
 Version:           26.0.1
 API version:       1.45
 Go version:        go1.21.9
 Git commit:        d260a54
 Built:             Thu Apr 11 10:54:01 2024
 OS/Arch:           linux/arm64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          26.0.1
  API version:      1.45 (minimum version 1.24)
  Go version:       go1.21.9
  Git commit:       60b9add
  Built:            Thu Apr 11 10:54:01 2024
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.6.31
  GitCommit:        e377cd56a71523140ca6ae87e30244719194a521
 runc:
  Version:          1.1.12
  GitCommit:        v1.1.12-0-g51d5e94
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

使用完通过shutdown -h now关机，完成后qemu程序会自动退出。

参考

1、https://blog.csdn.net/v6543210/article/details/124276623
2、https://quard-star-tutorial.readthedocs.io/zh-cn/latest/ext3.html
3、https://mp.weixin.qq.com/s/bGY7BJdIz3SE491SclKRMQ
4、https://blog.csdn.net/u011011827/article/details/129771760

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