Build script for WSL2-Linux-Kernel 5.15y for Ubuntu LTS guest

build.sh

#!/bin/bash -e
BRANCH=linux-msft-wsl-5.15.y

if [ "$EUID" -ne 0 ]; then
    echo "Swithing to root..."
    exec sudo $0 "$@"
fi

apt-get install -y git dkms

git clone -b $BRANCH  --no-checkout  --depth=1 https://github.com/microsoft/WSL2-Linux-Kernel.git
cd WSL2-Linux-Kernel
git sparse-checkout set --no-cone /drivers/hv/dxgkrnl /include/uapi/misc/d3dkmthk.h
git checkout

BATCH='test'
RUN=$(git rev-parse --short HEAD)
VERSION="${RUN}${BATCH}"

    curl -fsSL https://content.staralt.dev/dxgkrnl-dkms/main/0001-Add-a-gpu-pv-support.patch | git apply -v
    echo
    curl -fsSL https://content.staralt.dev/dxgkrnl-dkms/main/0002-Add-a-multiple-kernel-version-support.patch | git apply -v
    echo
    curl -fsSL https://content.staralt.dev/dxgkrnl-dkms/main/0003-Fix-gpadl-has-incomplete-type-error.patch | git apply -v
    echo

cp -r drivers/hv/dxgkrnl /usr/src/dxgkrnl-$VERSION
mkdir -p /usr/src/dxgkrnl-$VERSION/include/{uapi/misc,linux}
cp include/uapi/misc/d3dkmthk.h /usr/src/dxgkrnl-$VERSION/include/uapi/misc/d3dkmthk.h
sed -i 's/\$(CONFIG_DXGKRNL)/m/' /usr/src/dxgkrnl-$VERSION/Makefile
echo "EXTRA_CFLAGS=-I\$(PWD)/include -D_MAIN_KERNEL_" >> /usr/src/dxgkrnl-$VERSION/Makefile

cat > /usr/src/dxgkrnl-$VERSION/dkms.conf <<EOF
PACKAGE_NAME="dxgkrnl"
PACKAGE_VERSION="$VERSION"
BUILT_MODULE_NAME="dxgkrnl"
DEST_MODULE_LOCATION="/kernel/drivers/hv/dxgkrnl/"
AUTOINSTALL="yes"
EOF



wget https://raw.githubusercontent.com/thexperiments/dxgkrnl-dkms-git/main/dxgkrnl.h.patch
patch -u /usr/src/dxgkrnl-$VERSION/dxgkrnl.h ./dxgkrnl.h.patch
sed -i 's/l(event->cpu_event, 1)/l(event->cpu_event)/g' /usr/src/dxgkrnl-$VERSION/dxgmodule.c


dkms add dxgkrnl/$VERSION
dkms build dxgkrnl/$VERSION
dkms install dxgkrnl/$VERSION

This compiles off git for WSL kernel mod directly for ubuntu 24.04 using LTS kernel. IE 6.8.0-39-generic

Other repos used for patches:
https://github.com/thexperiments/dxgkrnl-dkms-git?tab=readme-ov-file
https://github.com/staralt/dxgkrnl-dkms

In my testing Linux GPU_PV only seems to work if all GPU's (if multiple/multi vendor) are passed through. Manually selecting one specific GPU fails when trying to initialize the card in my attempts.

Please see this GitHub for info as well as previously listed ones for info in setting up driver's files between Host and Guest as well as partitioning GPU for passthrough .
https://github.com/brokeDude2901/dxgkrnl_ubuntu?tab=readme-ov-file

Tested on a system with 3 Gpus from 2 vendors all 3 devices show as Microsoft dxg devices.

#This example works for passing through multiple gpus into ubuntu..
$gpu_list = Get-VMHostPartitionableGpu
foreach ($k in $gpu_list){
$instance_path = $k.Name
$instance_path
Add-VMGpuPartitionAdapter -VMName $vm -InstancePath $instance_path
}