kernel instalation

[lisbravo]

Im sorry if this is not the right place for this question but, are you sure that
sudo make install
will install the newly compiled kernel y wsl 2? I've followed your instructions many times with no success just to find that the kernel in the /boot is not the one that wsl uses

[rpasek]

Hi psykhon,
I'm pretty sure it does but I haven't confirmed 100% that it's loading the new kernel. If you look carefully you'll notice that this method is simply modprobing in kernel modules that we've built, not building the drivers into the kernel.

One thing that had me stumped for a while is that WSL 2 seems to only run the exact named version as installed. If you acquired the source using git, if you make changes to files that are not ignored by git, the Linux build process will append a + to the name of the kernel to indicate that your build is dirty. For example you may see at the end of the Linux build:
DEPMOD 4.19.43-microsoft-standard+

To get around this you could do:
sudo make LOCALVERSION= (note my previous edit of this comment is wrong)

I found this information on https://stackoverflow.com/questions/19333918/dont-add-to-linux-kernel-version

[lisbravo]

By now I can confirm that make install does not loads the new kernel
https://github.com/MicrosoftDocs/WSL/releases/tag/18947
still havent had any success runing a new kernel in this way but I'll get back to you when I manage to do it

[lisbravo]

I manage to get it working:
-First I just compiled a kernel with ms defaults
sudo make KCONFIG_CONFIG=Microsoft/config-wsl
-Copied
/usr/src/4.19.57-microsoft-standard/arch/x86/boot/compressed/vmlinux.bin
to
C:\Users\lbrav\kernel
-Added a .wslconfig file in C:\Users\lbrav\ with
[wsl2] #kernel=C:\\Users\\lbrav\\kernel\\vmlinux.bin
-Restart WSL
wsl --shutdown wsl -d Ubuntu

[ConnorChristie]

Thank you @lisbravo! Installing the custom kernel by using the wsl2 config worked like a treat. Then I was able to install the kernel modules and finally run the startusb.sh without seeing any errors!

[CalebGreer]

I tried to run the command for compiling a kernel with ms defaults

sudo make KCONFIG_CONFIG=Microsoft/config-wsl

it gives me this output:

***
*** Configuration file "Microsoft/config-wsl" not found!
***
*** Please run some configurator (e.g. "make oldconfig" or
*** "make menuconfig" or "make xconfig").
***
scripts/kconfig/Makefile:69: recipe for target 'syncconfig' failed
make[2]: *** [syncconfig] Error 1
Makefile:534: recipe for target 'syncconfig' failed
make[1]: *** [syncconfig] Error 2
Makefile:633: recipe for target 'include/config/auto.conf.cmd' failed
make: *** [include/config/auto.conf.cmd] Error 2```

I have run the configurator so I am not sure what the next step in fixing this would be

[theseankelly]

It's been a couple weeks since I did this, but I think I followed the instructions in the primary readme (take care to check out the correct branch, per issue number #3).

Specifically, these steps (again, use the actual version/git tag that matches your kernel at the moment, mine is 4.19.104-microsoft-standard, git tag 4.19.104-microsoft-standard

/usr/src/4.19.104-microsoft-standard$ sudo cp /proc/config.gz config.gz
/usr/src/4.19.104-microsoft-standard$ sudo gunzip config.gz
/usr/src/4.19.104-microsoft-standard$ sudo mv config .config
/usr/src/4.19.104-microsoft-standard$ sudo make menuconfig

Instead of make KCONFIG_CONFIG=Microsoft/config-wsl. In theory using the current config from proc/config.gz from within WSL should be the WSL defaults.

Anyway, the key was to copy the kernel out of WSL and then point WSL At it in .wslconf per @lisbravo 's comment.

[pagkly]

Hi @theseankelly and @lisbravo I could not get it to work.
I already tried checkout v4.19.84 and it would show something @CalebGreer had posted being
*** Configuration file "Microsoft/config-wsl" not found!

When I checkout 4.19.84-microsoft-standard it showed something like

user@DESKTOP-KDJ7PIR:/usr/src/4.19.84-microsoft-standard$ sudo git checkout 4.19.84-microsoft-standard
M       Microsoft/config-wsl
HEAD is now at db998769a92e Merge tag 'v4.19.84' into linux-msft-wsl-4.19.y
user@DESKTOP-KDJ7PIR:/usr/src/4.19.84-microsoft-standard$

and sudo make KCONFIG_CONFIG=Microsoft/config-wsl works
and show this at the end

  DEPMOD  4.19.84-microsoft-standard+
sh ./arch/x86/boot/install.sh 4.19.84-microsoft-standard+ arch/x86/boot/bzImage \
        System.map "/boot"
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.19.84-microsoft-standard+ /boot/vmlinuz-4.19.84-microsoft-standard+
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.19.84-microsoft-standard+ /boot/vmlinuz-4.19.84-microsoft-standard+
update-initramfs: Generating /boot/initrd.img-4.19.84-microsoft-standard+
W: mkconf: MD subsystem is not loaded, thus I cannot scan for arrays.
W: mdadm: failed to auto-generate temporary mdadm.conf file.
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.19.84-microsoft-standard+ /boot/vmlinuz-4.19.84-microsoft-standard+
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.19.84-microsoft-standard+ /boot/vmlinuz-4.19.84-microsoft-standard+

but whenever I startusb.sh

modprobe: FATAL: Module usbip-core not found in directory /lib/modules/4.19.84-microsoft-standard
modprobe: FATAL: Module vhci-hcd not found in directory /lib/modules/4.19.84-microsoft-standard

I did @lisbravo
[wsl2] #kernel=C:\\Users\username\\kernel\\vmlinux.bin
%userprofile%\.wslconfig and %userprofile%\kernel\vmlinux.bin and shutdown and restart wsl as well but startusb.sh still shows something like that.

usbip is working good and I have set up everything on the windows side. just left with the compiling

[Luigi90900]

Remove the # in front of kernel=C:\...\kernel\vmlinux.bin. The # comments out the line so it gets ignored. I did the same thing before realizing that.

My .wslconfig is:

[wsl2]
kernel=C:\\Users\\Luigi90900\\kernel\\vmlinux.bin
swap=0