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Linux 内核实验室 —— 基于 Docker/Qemu 的极速 Linux 内核学习、开发和测试环境。 spread retract

http://tinylab.org/linux-lab

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README.md

Linux Lab

This project aims to create a Qemu-based Linux development Lab to easier the learning, development and testing of Linux Kernel.

For Linux 0.11, please try our Linux 0.11 Lab.

Docker Qemu Linux Lab

Why

About 9 years ago, a tinylinux proposal: Work on Tiny Linux Kernel accepted by embedded linux foundation, therefore I have worked on this project for serveral months.

During the project cycle, several scripts written to verify if the adding tiny features (e.g. gc-sections) breaks the other kernel features on the main cpu architectures.

These scripts uses qemu-system-ARCH as the cpu/board simulator, basic boot+function tests have been done for ftrace+perf, accordingly, defconfigs, rootfs, test scripts have been prepared, at that time, all of them were simply put in a directory, without a design or holistic consideration.

They have slept in my harddisk for several years without any attention, untill one day, docker and novnc came to my world, at first, Linux 0.11 Lab was born, after that, Linux Lab was designed to unify all of the above scripts, defconfigs, rootfs and test scripts.

Now, Linux Lab becomes an intergrated Linux learning, development and testing environment, it supports:

  • Boards

    Qemu based, 6+ main Architectures, 10+ popular boards, one make list command for all boards, qemu options are hidden.

  • Components

    Uboot, Linux / Modules, Buildroot, Qemu are configurable, patchable, compilable, buildable, Linux v5.1 supported.

  • Prebuilt

    all of above components have been prebuilt and put in board specific bsp submodule for instant using, qemu v2.12.0 prebuilt for arm/arm64.

  • Rootfs

    Builtin rootfs support include initrd, harddisk, mmc and nfs, configurable via ROOTDEV/ROOTFS, Ubuntu 18.04 for ARM available as docker image: tinylab/armv32-ubuntu.

  • Docker

    Environment (cross toolchains) available in one command in serveral minutes, 5 main architectures have builtin support, external ones configurable via make toolchain.

  • Browser

    usable via modern web browsers, once installed in a internet server, available everywhere via web vnc or web ssh.

  • Network

    Builtin bridge networking support, every board support network.

  • Boot

    Support serial port, curses (ssh friendly) and graphic booting.

  • Testing

    Support automatic testing via make test target.

  • Debugging

    debuggable via make debug target.

Continue reading for more features and usage.

Homepage

See: http://tinylab.org/linux-lab/

Demonstration

Basic:

More:

Install docker

Docker is required by Linux Lab, please install it at first:

Notes:

In order to run docker without password, please make sure your user is added in the docker group:

$ sudo usermod -aG docker $USER

In order to speedup docker images downloading, please configure a local docker mirror in /etc/default/docker, for example:

$ grep registry-mirror /etc/default/docker
DOCKER_OPTS="$DOCKER_OPTS --registry-mirror=https://docker.mirrors.ustc.edu.cn"
$ service docker restart

In order to avoid network ip address conflict, please try following changes and restart docker:

$ grep bip /etc/default/docker
DOCKER_OPTS="$DOCKER_OPTS --bip=10.66.0.10/16"
$ service docker restart

If the above changes not work, try something as following:

$ grep dockerd /lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H fd:// --bip=10.66.0.10/16 --registry-mirror=https://docker.mirrors.ustc.edu.cn
$ service docker restart

For Ubuntu 12.04, please install the new kernel at first, otherwise, docker will not work:

$ sudo apt-get install linux-generic-lts-trusty

Choose a working directory

If installed via Docker Toolbox, please enter into the /mnt/sda1 directory of the default system on Virtualbox, otherwise, after poweroff, the data will be lost for the default /root directory is only mounted in DRAM.

$ cd /mnt/sda1

For Linux or Mac OSX, please simply choose one directory in ~/Downloads or ~/Documents.

$ cd ~/Documents

Download the lab

Use Ubuntu system as an example:

Download cloud lab framework, pull images and checkout linux-lab repository:

$ git clone https://gitee.com/tinylab/cloud-lab.git
$ cd cloud-lab/ && tools/docker/choose linux-lab

Run and login the lab

Launch the lab and login with the user and password printed in the console:

$ tools/docker/run linux-lab

Re-login the lab via web browser:

$ tools/docker/vnc linux-lab

Quickstart: Boot a board

Issue the following command to boot the prebuilt kernel and rootfs on the default versatilepb board:

$ make boot

Usage

Available boards

List builtin boards:

$ make list
[ aarch64/raspi3 ]:
      ARCH     = arm64
      CPU     ?= cortex-a53
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/mmcblk0
[ aarch64/virt ]:
      ARCH     = arm64
      CPU     ?= cortex-a57
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/vda
[ arm/versatilepb ]:
      ARCH     = arm
      CPU     ?= arm926t
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/ram0
[ arm/vexpress-a9 ]:
      ARCH     = arm
      CPU     ?= cortex-a9
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/ram0
[ i386/pc ]:
      ARCH     = x86
      CPU     ?= i686
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/ram0
[ mipsel/malta ]:
      ARCH     = mips
      CPU     ?= mips32r2
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/ram0
[ ppc/g3beige ]:
      ARCH     = powerpc
      CPU     ?= generic
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/ram0
[ riscv32/virt ]:
      ARCH     = riscv
      CPU     ?= any
      LINUX   ?= v5.0.13
      ROOTDEV ?= /dev/vda
[ riscv64/virt ]:
      ARCH     = riscv
      CPU     ?= any
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/vda
[ x86_64/pc ]:
      ARCH     = x86
      CPU     ?= x86_64
      LINUX   ?= v5.1
      ROOTDEV ?= /dev/ram0

Choose one board:

$ make BOARD=i386/pc

If the board name is unique, just type the short name, the first one found in boards will be used:

$ make BOARD=malta

Check the board specific configuration:

$ cat boards/arm/versatilepb/Makefile

Download sources

Download board specific package and the kernel, buildroot source code:

$ make core-source -j3

Download one by one:

$ make bsp-source
$ make kernel-source
$ make root-source

Checkout target versions

Checkout the target version of kernel and builroot:

$ make checkout

Checkout them one by one:

$ make kernel-checkout
$ make root-checkout

Patching

Apply available patches in boards/<BOARD>/bsp/patch/linux and patch/linux/:

$ make kernel-patch

Default Configuration

Configure kernel and buildroot with defconfig:

$ make config

Configure one by one, by default, use the defconfig in boards/<BOARD>/bsp/:

$ make kernel-defconfig
$ make root-defconfig

Configure with kernel patching:

$ make kernel-defconfig KP=1
$ make root-defconfig RP=1

Configure with specified defconfig:

$ make B=raspi3
$ make kernel-defconfig KCFG=bcmrpi3_defconfig
$ make root-defconfig KCFG=raspberrypi3_64_defconfig

If only defconfig name specified, search boards/ at first, and then the default configs path of buildroot, u-boot and linux-stable respectivly: buildroot/configs, u-boot/configs, linux-stable/arch//configs.

Manual Configuration

$ make kernel-menuconfig
$ make root-menuconfig

Old default configuration

$ make kernel-olddefconfig
$ make root-olddefconfig
$ make uboot-oldefconfig

Building

Build kernel and buildroot together:

$ make build

Build them one by one:

$ make kernel
$ make root

Build all internel kernel modules:

$ make modules
$ make modules-install
$ make root-rebuild     // not need for nfs boot
$ make boot

List available modules in modules/, boards/<BOARD>/modules/ and linux-stable/:

$ make m-l m=hello
     1	m=hello ; M=$PWD/modules/hello
$ make m-l m=tun,minix
     1	c=TUN ; m=tun ; M=drivers/net
     2	c=MINIX_FS ; m=minix ; M=fs/minix

Enable one kernel module:

$ make kernel-getconfig m=minix_fs
Getting kernel config: MINIX_FS ...

output/aarch64/linux-v5.1-virt/.config:CONFIG_MINIX_FS=m

$ make kernel-setconfig m=minix_fs
Setting kernel config: m=minix_fs ...

output/aarch64/linux-v5.1-virt/.config:CONFIG_MINIX_FS=m

Enable new kernel config: minix_fs ...

Build one kernel module (e.g. minix.ko):

$ make m M=fs/minix/
Or
$ make m m=minix

Install and clean the module:

$ make m-i M=fs/minix/
$ make m-c M=fs/minix/

More flexible usage:

$ make kernel-setconfig m=tun
$ make kernel x=tun.ko M=drivers/net
$ make kernel x=drivers/net/tun.ko
$ make kernel-run drivers/net/tun.ko

Build external kernel modules (the same as internel modules):

$ make m m=hello
Or
$ make k x=$PWD/modules/hello/hello.ko

Switch compiler version if exists, for example:

$ tools/gcc/switch.sh arm 4.3

Using more powerful goals

Linux Lab allows to access Makefile goals easily via xxx-run, for example:

$ make kernel-run help
$ make kernel-run menuconfig

$ make root-run help
$ make root-run busybox-menuconfig

$ make uboot-run help
$ make uboot-run menuconfig

-run goals allows to run sub-make goals of kernel, root and uboot directly without entering into their own building directory.

Booting

Boot with serial port (nographic) by default, exit with 'CTRL+a x', 'poweroff' or 'pkill qemu':

$ make boot

Boot with graphic:

$ make b=pc boot G=1 LINUX=v5.1
$ make b=versatilepb boot G=1 LINUX=v5.1
$ make b=g3beige boot G=1 LINUX=v5.1
$ make b=malta boot G=1 LINUX=v2.6.36
$ make b=vexpress-a9 boot G=1 LINUX=v4.6.7 // LINUX=v3.18.39 works too

Note: real graphic boot require LCD and keyboard drivers, the above three work well, with linux v5.1, raspi3, malta has tty0 console but without keyboard input.

vexpress-a9 and virt has no LCD support by default, but for the latest qemu, it is able to boot with G=1 and switch to serial console via the 'View' menu, this can not be used to test LCD and keyboard drivers. XOPTS specify the eXtra qemu options.

$ make b=vexpress-a9 CONSOLE=ttyAMA0 boot G=1 LINUX=v5.1
$ make b=virt boot G=1 LINUX=v5.1
$ make b=raspi3 CONSOLE=ttyAMA0 XOPTS="-serial vc -serial vc" boot G=1 LINUX=v5.1

Boot with curses graphic (friendly to ssh login, not work for all boards, exit with 'ESC+2 quit'):

$ make b=pc boot G=2

Boot with prebuilt kernel and rootfs (if no new available, simple use make boot):

$ make boot PBK=1 PBD=1 PBR=1

Boot with new kernel, dtb and rootfs if exists (if new available, simple use make boot):

$ make boot PBK=0 PBD=0 PBR=0

Boot without Uboot (only versatilepb and vexpress-a9 boards tested):

$ make boot U=0

Boot with different rootfs (depends on board, check /dev/ after boot):

$ make boot ROOTDEV=/dev/ram      // support by all boards, basic boot method
$ make boot ROOTDEV=/dev/nfs      // depends on network driver, only raspi3 not work
$ make boot ROOTDEV=/dev/sda
$ make boot ROOTDEV=/dev/mmcblk0
$ make boot ROOTDEV=/dev/vda      // virtio based block device

Boot with extra kernel command line (XKCLI = eXtra Kernel Command LIne):

$ make boot ROOTDEV=/dev/nfs XKCLI="init=/bin/bash"

Using kernel options

A tool named scripts/config in linux kernel is helpful to get/set the kernel config options non-interactively, based on it, both of kernel-getconfig/k-gc and kernel-setconfig/k-sc are added to tune the kernel options, with them, we can simply "enable/disable/setstr/setval/getstate" of a kernel option or many at the same time:

Get state of a kernel module:

$ make kernel-getconfig m=minix_fs
Getting kernel config: MINIX_FS ...

output/aarch64/linux-v5.1-virt/.config:CONFIG_MINIX_FS=m

Enable a kernel module:

$ make kernel-setconfig m=minix_fs
Setting kernel config: m=minix_fs ...

output/aarch64/linux-v5.1-virt/.config:CONFIG_MINIX_FS=m

Enable new kernel config: minix_fs ...

More control commands of kernel-setconfig including y, n, c, o, s, v:

`y`, build the modules in kernel or enable anther kernel options.
`c`, build the modules as pluginable modules, just like `m`.
`o`, build the modules as pluginable modules, just like `m`.
`n`, disable a kernel option.
`s`, `RTC_SYSTOHC_DEVICE="rtc0"`, set the rtc device to rtc0
`v`, `v=PANIC_TIMEOUT=5`, set the kernel panic timeout to 5 secs.

Operates many options in one command line:

$ make k-sc m=tun,minix_fs y=ikconfig v=panic_timeout=5 s=DEFAULT_HOSTNAME=linux-lab n=debug_info
$ make k-gc o=tun,minix,ikconfig,panic_timeout,hostname

Using kernel features

Kernel features are abstracted in `feature/linux/, including their configurations patchset, it can be used to manage both of the out-of-mainline and in-mainline features.

$ make f-l
[ feature/linux ]:
  + 9pnet
  + core
    - debug
    - module
  + ftrace
    - v2.6.36
      * env.g3beige
      * env.malta
      * env.pc
      * env.versatilepb
    - v2.6.37
      * env.g3beige
  + gcs
    - v2.6.36
      * env.g3beige
      * env.malta
      * env.pc
      * env.versatilepb
  + kft
    - v2.6.36
      * env.malta
      * env.pc
  + uksm
    - v2.6.38

Verified boards and linux versions are recorded there, so, it should work without any issue if the environment not changed.

For example, to enable kernel modules support, simply do:

$ make f f=module
$ make kernel-olddefconfig
$ make kernel

For kft feature in v2.6.36 for malta board:

$ make BOARD=malta
$ export LINUX=v2.6.36
$ make kernel-checkout
$ make kernel-patch
$ make kernel-defconfig
$ make f f=kft
$ make kernel-olddefconfig
$ make kernel
$ make boot

Using Uboot

Choose one of the tested boards: versatilepb and vexpress-a9.

$ make BOARD=vexpress-a9

Download Uboot:

$ make uboot-source

Checkout the specified version:

$ make uboot-checkout

Patching with necessary changes, BOOTDEV and ROOTDEV available, use tftp by default.

$ make uboot-patch

Use tftp, sdcard or flash explicitly, should run make uboot-checkout before a new uboot-patch:

$ make uboot-patch BOOTDEV=tftp
$ make uboot-patch BOOTDEV=sdcard
$ make uboot-patch BOOTDEV=flash

BOOTDEV is used to specify where to store and load the images for uboot, ROOTDEV is used to tell kernel where to load the rootfs.

Configure:

$ make uboot-defconfig
$ make uboot-menuconfig

Building:

$ make uboot

Boot with BOOTDEV and ROOTDEV, use tftp by default:

$ make boot U=1

Use tftp, sdcard or flash explicitly:

$ make boot U=1 BOOTDEV=tftp
$ make boot U=1 BOOTDEV=sdcard
$ make boot U=1 BOOTDEV=flash

We can also change ROOTDEV during boot, for example:

$ make boot U=1 BOOTDEV=flash ROOTDEV=/dev/nfs

Clean images if want to update ramdisk, dtb and uImage:

$ make uboot-images-clean
$ make uboot-clean

Save uboot images and configs:

$ make uboot-save
$ make uconfig-save

Using external qemu

Builtin qemu may not work with the newest linux kernel, so, we need compile and add external prebuilt qemu, this has been tested on vexpress-a9 and virt board.

At first, build qemu-system-ARCH:

$ make B=vexpress-a9

$ make qemu-download
$ make qemu-patch
$ make qemu-defconfig
$ make qemu
$ make qemu-save

qemu-ARCH-static and qemu-system-ARCH can not be compiled together. to build qemu-ARCH-static, please enable QEMU_US=1 in board specific Makefile and rebuild it.

If QEMU and QTOOL specified, the one in bsp submodule will be used in advance of one installed in system, but the first used is the one just compiled if exists.

While porting to newer kernel, Linux 5.0 hangs during boot on qemu 2.5, after compiling a newer qemu 2.12.0, no hang exists. please take notice of such issue in the future kernel upgrade.

Using external toolchain

The pace of Linux mainline is very fast, builtin toolchains can not keep up, to reduce the maintaining pressure, external toolchain feature is added. for example, ARM64/virt, CCVER and CCPATH has been added for it.

Download, decompress and enable the external toolchain:

$ make toolchain

If not external toolchain there, the builtin will be used back.

If no builtin toolchain exists, please must use this external toolchain feature, currently, aarch64, arm, riscv, i386, x86_64 support such feature.

Using external rootfs

Builtin rootfs is minimal, is not enough for complex application development, which requires modern Linux distributions.

Such a type of rootfs has been introduced and has been released as docker image, ubuntu 18.04 is added for arm32v7 at first, more later.

Run it via docker directly:

$ docker run -it tinylab/arm32v7-ubuntu

Extract it out and run in Linux Lab:

ARM32/vexpress-a9:

$ tools/rootfs/docker/extract.sh tinylab/arm32v7-ubuntu arm
$ make boot B=vexpress-a9 U=0 V=1 MEM=1024M ROOTDEV=/dev/nfs ROOTFS=$PWD/prebuilt/fullroot/tmp/tinylab-arm32v7-ubuntu

ARM64/raspi3:

$ tools/rootfs/docker/extract.sh tinylab/arm64v8-ubuntu arm
$ make boot B=raspi3 V=1 ROOTDEV=/dev/mmcblk0 ROOTFS=$PWD/prebuilt/fullroot/tmp/tinylab-arm64v8-ubuntu

More rootfs from docker can be found:

$ docker search arm64 | egrep "ubuntu|debian"
arm64v8/ubuntu   Ubuntu is a Debian-based Linux operating system  25
arm64v8/debian   Debian is a Linux distribution that's composed  20

Debugging

Compile the kernel with CONFIG_DEBUG_INFO=y and debug it directly:

$ make BOARD=malta debug

It will open a new terminal, load the scripts from .gdbinit, run gdb automatically.

Or debug it in two steps:

$ make BOARD=malta boot DEBUG=1

Open a new terminal:

$ make env | grep KERNEL_OUTPUT
/labs/linux-lab/output/mipsel/linux-4.6-malta/

$ mipsel-linux-gnu-gdb output/mipsel/linux-4.6-malta/vmlinux
(gdb) target remote :1234
(gdb) b kernel_entry
(gdb) b start_kernel
(gdb) b do_fork
(gdb) c
(gdb) c
(gdb) c
(gdb) bt

Note: some commands have been already added in .gdbinit, you can customize it for yourself.

Testing

Use 'aarch64/virt' as the demo board here.

$ make BOARD=virt

Prepare for testing, install necessary files/scripts in system/:

$ make rootdir
$ make root-install
$ make root-rebuild

Simply boot and poweroff:

$ make test

Don't poweroff after testing:

$ make test TEST_FINISH=echo

Run guest test case:

$ make test TEST_CASE=/tools/ftrace/trace.sh

Run guest test cases (need install new system/ via make r-i):

$ make test TEST_BEGIN=date TEST_END=date TEST_CASE='ls /root,echo hello world'

Reboot the guest system for several times:

$ make test TEST_REBOOT=2

Test a feature of a specified linux version on a specified board, prepare equals checkout, patch and defconfig:

$ make test f=kft LINUX=v2.6.36 BOARD=malta TEST_PREPARE=prepare

Test a kernel module:

$ make test m=hello TEST_PREPARE=prepare

Test multiple kernel modules:

$ make test m=exception,hello TEST_PREPARE=prepare

Test modules with specified ROOTDEV, nfs boot is used by default, but some boards may not support network:

$ make test m=hello,exception TEST_RD=/dev/ram0

Run test cases while testing kernel modules (test cases run between insmod and rmmod):

$ make test m=exception TEST_BEGIN=date TEST_END=date TEST_CASE='ls /root,echo hello world'

Run test cases while testing internal kernel modules:

$ make test m=lkdtm TEST_BEGIN='mount -t debugfs debugfs /mnt' TEST_CASE='echo EXCEPTION ">" /mnt/provoke-crash/DIRECT'

Run test cases while testing internal kernel modules, pass kernel arguments:

$ make test m=lkdtm lkdtm_args='cpoint_name=DIRECT cpoint_type=EXCEPTION'

Run test without feature-init (save time if not necessary, FI=FEATURE_INIT):

$ make test m=lkdtm lkdtm_args='cpoint_name=DIRECT cpoint_type=EXCEPTION' FI=0
Or
$ make raw-test m=lkdtm lkdtm_args='cpoint_name=DIRECT cpoint_type=EXCEPTION'

Run test with module and the module's necessary dependencies (check with make kernel-menuconfig):

$ make test m=lkdtm y=runtime_testing_menu,debug_fs lkdtm_args='cpoint_name=DIRECT cpoint_type=EXCEPTION'

Run test without feature-init, boot-init, boot-finish and no TEST_PREPARE:

$ make boot-test m=lkdtm lkdtm_args='cpoint_name=DIRECT cpoint_type=EXCEPTION'

Test a kernel module and make some targets before testing:

$ make test m=exception TEST=kernel-checkout,kernel-patch,kernel-defconfig

Test everything in one command (from download to poweroff):

$ make test TEST=kernel-full,root-full

Test everything in one command (with uboot while support, e.g. vexpress-a9):

$ make test TEST=kernel-full,root-full,uboot-full

Test kernel hang during boot, allow to specify a timeout, timeout must happen while system hang:

$ make test TEST_TIMEOUT=30s

Notes: * If 'poweroff' fails on some boards with bad linux version, 'make test' will hang there.

Save images and configs

Save all of the configs and rootfs/kernel/dtb images:

$ make save

Save configs and images to boards/<BOARD>/bsp/:

$ make kconfig-save
$ make rconfig-save

$ make root-save
$ make kernel-save

Choose a new board

By default, the default board: 'versatilepb' is used, we can configure, build and boot for a specific board with 'BOARD', for example:

$ make BOARD=malta

$ make root-defconfig
$ make root

$ make kernel-checkout
$ make kernel-patch
$ make kernel-defconfig
$ make kernel

$ make boot U=0

If using board, it only works on-the-fly, the setting will not be saved, this is helpful to run multiple boards at the same and not to disrupt each other:

$ make board=malta root-defconfig
$ make board=malta root

$ make board=malta kernel-checkout
$ make board=malta kernel-patch
$ make board=malta kernel-defconfig
$ make board=malta kernel

$ make board=malta boot U=0

This allows to run multi boards in different terminals or background at the same time.

Files transfering

To transfer files between Qemu Board and Host, three methods are supported by default:

Install files to rootfs

Simply put the files with a relative path in system/, install and rebuild the rootfs:

$ cd system/
$ mkdir system/root/
$ touch system/root/new_file
$ make root-install
$ make root-rebuild
$ make boot G=1

Share with NFS

Boot the board with ROOTDEV=/dev/nfs,

Boot/Qemu Board:

$ make boot ROOTDEV=/dev/nfs

Host:

$ make env | grep ROOTDIR
ROOTDIR = /linux-lab/<BOARD>/bsp/root/<BUILDROOT_VERSION>/rootfs

Transfer via tftp

Using tftp server of host from the Qemu board with the tftp command.

Host:

$ ifconfig br0
inet addr:172.17.0.3  Bcast:172.17.255.255  Mask:255.255.0.0
$ cd tftpboot/
$ ls tftpboot
kft.patch kft.log

Qemu Board:

$ ls
kft_data.log
$ tftp -g -r kft.patch 172.17.0.3
$ tftp -p -r kft.log -l kft_data.log 172.17.0.3

Note: while put file from Qemu board to host, must create an empty file in host firstly. Buggy?

Share with 9p virtio

To enable 9p virtio for a new board, please refer to qemu 9p setup. qemu must be compiled with --enable-virtfs, and kernel must enable the necessary options.

Reconfigure the kernel with:

CONFIG_NET_9P=y
CONFIG_NET_9P_VIRTIO=y
CONFIG_NET_9P_DEBUG=y (Optional)
CONFIG_9P_FS=y
CONFIG_9P_FS_POSIX_ACL=y
CONFIG_PCI=y
CONFIG_VIRTIO_PCI=y
CONFIG_PCI_HOST_GENERIC=y (only needed for the QEMU Arm 'virt' board)

If using -virtfs or -device virtio-9p-pci option for qemu, must enable the above PCI related options, otherwise will not work:

9pnet_virtio: no channels available for device hostshare
mount: mounting hostshare on /hostshare failed: No such file or directory'

-device virtio-9p-device requires less kernel options.

To enable the above options, please simply type:

$ make feature f=9pnet $ make kernel-olddefconfig

Docker host:

$ modprobe 9pnet_virtio
$ lsmod | grep 9p
9pnet_virtio           17519  0
9pnet                  72068  1 9pnet_virtio

Host:

$ make BOARD=virt

$ make root-install	       # Install mount/umount scripts, ref: system/etc/init.d/S50sharing
$ make root-rebuild

$ touch hostshare/test     # Create a file in host

$ make boot U=0 ROOTDEV=/dev/ram0 PBR=1 SHARE=1

$ make boot SHARE=1 SHARE_DIR=modules   # for external modules development

$ make boot SHARE=1 SHARE_DIR=output/aarch64/linux-v5.1-virt/   # for internal modules learning

$ make boot SHARE=1 SHARE_DIR=examples   # for c/assembly learning

Qemu Board:

$ ls /hostshare/       # Access the file in guest
test
$ touch /hostshare/guest-test   # Create a file in guest

Verified boards with Linux v5.1:

aarch64/virt: virtio-9p-device (virtio-9p-pci breaks nfsroot)
arm/vexpress-a9: only work with virtio-9p-device and without uboot booting
arm/versatilepb: only work with virtio-9p-pci
x86_64/pc, only work with virtio-9p-pci
i386/pc, only work with virtio-9p-pci
riscv64/virt, work with virtio-9p-pci and virtio-9p-dev
riscv32/virt, work with virtio-9p-pci and virtio-9p-dev

Plugins

The 'Plugin' feature is supported by Linux Lab, to allow boards being added and maintained in standalone git repositories. Standalone repository is very important to ensure Linux Lab itself not grow up big and big while more and more boards being added in.

Book examples or the boards with a whole new cpu architecture benefit from such feature a lot, for book examples may use many boards and a new cpu architecture may need require lots of new packages (such as cross toolchains and the architecture specific qemu system tool).

Here maintains the available plugins:

More

Add a new board

Chooose a board supported by qemu

list the boards, use arm as an example:

$ qemu-system-arm -M ?

Create the board directory

Use vexpress-a9 as an example:

$ mkdir boards/arm/vexpress-a9/

Clone a Makefile from an existing board

Use versatilepb as an example:

$ cp boards/arm/versatilebp/Makefile boards/arm/vexpress-a9/Makefile

Configure the variables from scratch

Comment everything, add minimal ones and then others.

Please refer to doc/qemu/qemu-doc.html or the online one http://qemu.weilnetz.de/qemu-doc.html.

At the same time, prepare the configs

We need to prepare the configs for linux, buildroot and even uboot.

Buildroot has provided many examples about buildroot and kernel configuration:

  • buildroot: buildroot/configs/qemu_ARCH_BOARD_defconfig
  • kernel: buildroot/board/qemu/ARCH-BOARD/linux-VERSION.config

Uboot has also provided many default configs:

  • uboot: u-boot/configs/vexpress_ca9x4_defconfig

Kernel itself also:

  • kernel: linux-stable/arch/arm/configs/vexpress_defconfig

Edit the configs and Makefile untill they match our requirements.

The configuration must be put in boards/<BOARD>/ and named with necessary version and arch info, use raspi3 as an example:

$ ls boards/aarch64/raspi3/*defconfig
boards/aarch64/raspi3/buildroot_cortex-a53_defconfig
boards/aarch64/raspi3/linux_v5.1_defconfig

cortex-a53 is the CPU version, v5.1 is the kernel version, both of these variables should be configured in boards/<BOARD>/Makefile.

Choose the versions of kernel, rootfs and uboot

Please use 'tag' instead of 'branch', use kernel as an example:

$ cd linux-stable
$ git tag
...
v5.0
...
v5.1
..
v5.1.1
v5.1.5
...

If want v5.1 kernel, just put a line "LINUX = v5.1" in boards/<BOARD>/Makefile.

Configure, build and boot them

Use kernel as an example:

$ make kernel-defconfig
$ make kernel-menuconfig
$ make kernel
$ make boot

The same to rootfs, uboot and even qemu.

Save the images and configs

$ make root-save
$ make kernel-save
$ make uboot-save

$ make rconfig-save
$ make kconfig-save
$ make uconfig-save

Upload everything

At last, upload the images, defconfigs, patchset to board specific bsp submodule repository.

Learning Assembly

Linux Lab has added many assembly examples in examples/assembly:

$ cd examples/assembly
$ ls
aarch64  arm  mips64el	mipsel	powerpc  powerpc64  README.md  x86  x86_64
$ make -s -C aarch64/
Hello, ARM64!

Notes

Note1

Different qemu version uses different kernel VERSION, so, to find the suitable kernel version, we can checkout different git tags.

Note2

If nfs or tftpboot not work, please run modprobe nfsd in host side and restart the net services via /configs/tools/restart-net-servers.sh and please make sure not use tools/docker/trun.

Note3

To use the tools under tools without sudo, please make sure add your account to the docker group and reboot your system to take effect:

$ sudo usermod -aG docker $USER

Note4

To optimize docker images download speed, please edit DOCKER_OPTS in /etc/default/docker via referring to tools/docker/install.

Note5

We assume the docker network is 10.66.0.0/16, if not, we'd better change it.

$ cat /etc/default/docker | grep bip
DOCKER_OPTS="$DOCKER_OPTS --bip=10.66.0.10/16"

$ cat /lib/systemd/system/docker.service | grep bip
ExecStart=/usr/bin/dockerd -H fd:// --bip=10.66.0.10/16

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