First draft of changes

Author: chessturo

README.md

@@ -28,21 +28,32 @@ Instructions for building an x86_64 WSL2 kernel with an Ubuntu distribution are
 as follows:
 
 1. Install the build dependencies:  
-   `$ sudo apt install build-essential flex bison dwarves libssl-dev libelf-dev cpio`
+   `$ sudo apt install build-essential flex bison dwarves libssl-dev libelf-dev cpio qemu-utils`
 
 2. Modify WSL2 kernel configs (optional):  
    `$ make menuconfig KCONFIG_CONFIG=Microsoft/config-wsl`
 
-When using a custom-built kernel, loadable module support is disabled.
-Configurations set as modules (=m) won’t be available. Set any needed modules
-to built-in (=y) before building your custom kernel.
+3. Build the kernel using the WSL2 kernel configuration and put the modules in a `modules`
+   folder under the current working directory:  
+   `$ make KCONFIG_CONFIG=Microsoft/config-wsl MODLIB="$PWD/modules"`
 
-If you prefer the old configuration before WSL introduced loadable module
-support, you can use the old config file from the linux-msft-wsl-5.15.y branch
-to build your v6.6 WSL2 kernel.
+4. Calculate the modules size (plus 1024 bytes for slack):
+   `modules_size=$(du -s "$PWD/modules" | awk '{print $1;}'); modules_size=$((modules_size + 1024));`
 
-3. Build the kernel using the WSL2 kernel configuration:  
-   `$ make KCONFIG_CONFIG=Microsoft/config-wsl`
+5. Create a blank image file for the modules:
+   `dd if=/dev/zero of="$PWD/modules.img" bs=1 count=$modules_size`
+
+6. Setup filesystem and mount img file:
+   `lo_dev=$(losetup --find --show "$PWD/modules.img"); mkfs -t ext4 $lo_dev; sudo mount $lo_dev "$PWD/modules_img"`
+
+7. Copy over the modules, unmount the img now that we're done with it:
+   `cp -r "$PWD/modules" "$PWD/modules_img"; sudo umount "$PWD/modules_img"`
+
+8. Convert the img to VHDX:
+   `qemu-img convert -O VHDX "$PWD/modules.img" "$PWD/modules.vhdx"`
+
+9. Clean up:
+   `rm modules.img # optionally $PWD/modules dir too`
 
 # Install Instructions