Custom Linux/x86 Kernel Configuration

Merge the last linux kernel configuration from Microsoft for Windows Subsystem for Linux 2 with the upstream torvalds linux sources

Compile Mainline Kernel for WSL2

Steps for compile Kernel Linux 6.1.y. Can use the script build.sh to automate the download, configuration, and compilation of the kernel source code for WSL2

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Actual Kernel

uname -a
Linux DESKTOP-ID 4.19.128-microsoft-standard #1 SMP Tue Jun 23 12:58:10 UTC 2020 x86_64 GNU/Linux

Work dir linux

mkdir -p linux
cd linux

Install requirements for Build

sudo apt install git bc build-essential flex bison libssl-dev libelf-dev dwarves

Download Linux source code

wget https://github.com/torvalds/linux/archive/refs/tags/v5.15.tar.gz -O v5.15.tar.gz

Untar linux sources

tar -xf v5.15.tar.gz

Download config WSL

wget https://github.com/microsoft/WSL2-Linux-Kernel/raw/linux-msft-wsl-5.10.y/Microsoft/config-wsl

Copy config WSL as default config to the linux config dir

cp config-wsl linux-5.15/arch/x86/configs/wsl_defconfig

Generate the Configuration and Build

cd linux-5.15
make KCONFIG_CONFIG=arch/x86/configs/wsl_defconfig -j4

Copy Linux kernel to YOUR_USER

powershell.exe /C 'Copy-Item .\arch\x86\boot\bzImage $env:USERPROFILE'

Point to your custom kernel in .wslconfig:

powershell.exe /C 'Write-Output [wsl2]`nkernel=$env:USERPROFILE\bzImage | % {$_.replace("\","\\")} | Out-File $env:USERPROFILE\.wslconfig -encoding ASCII'

[wsl2]
kernel=C:\\Users\\<YOUR_USER>\\bzImage

Shutdown WSL

wsl --shutdown

Check shutdown the distro WSL

wsl -l -v

Start distro

wsl -d Debian

New Kernel Linux

uname -a

Linux HP450-2 5.15.0-oleksis-microsoft-standard-WSL2 #1 SMP Mon Nov 29 01:14:26 EST 2021 x86_64 x86_64 x86_64 GNU/Linux