`WSL kernel is not USBIP capable` with WSL pre-release 2.3.11

[polyzen]

I can't seem to find anything matching vhci nor usbip under /sys. Not sure if there's some place else to check with Linux 6.x or what.

sudo usbip list --remote=$IP results in usbip: error: could not connect to $IP:3240: System error Edit: Apparently irrelevant

Distro is Arch Linux.

Edit: Just to note I tried both the latest release and the dev build.

[dorssel]

On your WSL instance, what is the output of cat /sys/devices/platform/vhci_hcd.0/status?

[polyzen]

On July 17, 2024 7:28:12 PM EDT, Frans van Dorsselaer ***@***.***> wrote: On your WSL instance, what is the output of `cat /sys/devices/platform/vhci_hcd.0/status`?

That directory does not exist.

…

-- Best, Daniel <https://danielcapella.com>

[dorssel]

What is the output of zgrep CONFIG_USBIP /proc/config.gz?

[polyzen]

CONFIG_USBIP_CORE=m
CONFIG_USBIP_VHCI_HCD=m
CONFIG_USBIP_VHCI_HC_PORTS=8
CONFIG_USBIP_VHCI_NR_HCS=1
CONFIG_USBIP_HOST=m
# CONFIG_USBIP_DEBUG is not set

[dorssel]

Ah, they modularized it! (=m); this used to be monolithically built-in (=y).
You need to load the module first: sudo modprobe vhci-hcd.

[polyzen]

Works now :D

[polyzen]

https://wiki.archlinux.org/title/Kernel_module#systemd docs for automatic module loading

Should I leave this open until this is documented or something?

[dorssel]

No, but I would report this to https://github.com/microsoft/WSL/issues. I don't think it is intended. But if it is, we would like to know that too. It has happened in the past that they inadvertently put some config settings to "module", whereas the WSL kernel (at least until now) is supposed to be entirely monolithic.

[dorssel]

BTW: it worthwhile noting thay CONFIG_USBIP_HOST=m makes absolutely no sense. It used to be # CONFIG_USBIP_HOST is not set. WSL can never be a USB host. There is no physical USB, and the Linux USBIP subsystem does not allow forwarding client USB devices.

[polyzen]

microsoft/WSL#11792

[dorssel]

EDIT
From the release notes it appears they are going the modularized way... No definitive answer yet, see
It has been confirmed that future WSL kernels will be modularized, see
microsoft/WSL#11789 (comment)

In the meanwhile, I've attempted supporting it, see #996.

Could you give the development installer a try? It is at https://github.com/dorssel/usbipd-win/actions/runs/9997393400?pr=996

Please test:

• clean WSL boot (wsl --shutdown first)
• without loading the module manually: usbipd attach --wsl
• usbipd detach
• while the module is already loaded: usbipd attach --wsl

Please post the console output. Thx.