Selfhosted

There's a huge list of reasons why this is not going to work, or not work well.

I'll stick to the biggest issue though, which is that OpenWRT expects exclusive control over the wireless chipset, and you're trying to run it through a VM on whoknowswhat hypervisor settings. Even if nothing else on the host machine uses the Wi-Fi adapter, OpenWRT has specific builds and kernel patches for specific drivers and specific hardware combinations. If it doesn't see exactly what it's expecting, it's not going to work.

Now...even if you DID manage to get it to seemingly work, it will constantly crash or panic if you engage the wireless chipset on a hypervisor because it's going to throw some disallowed instruction expecting exclusive control and access to the hardware.

I know this, because this is how it works, they say so in their own docs, and you can see people say the same thing over and over again this exact same thing. It's not going to be a good time.

If you want to just use software portions for network services or whatever, that shouldn't cause issues, but again, doing it through a VM is like dressing a Yugo up as a Ferrari and expecting the same performance.

If you're going to dive in to openwrt from google wifi you should probably start with ready made hardware.

https://forum.openwrt.org/t/best-newcomer-routers-2024/189050

Please keep in mind that to duplicate mesh functionality it's going to take a significant effort and you need to make sure the hardware you buy is compatible with 802.11s. Open WRT forums have hardware compatibility rundowns of known working routers so it's not too difficult to find them.

This is a much bigger uphill battle rolling your own hardware unless you just plan to buy a separate access point or two for hardware and skip the mesh functionality.

You want a dedicated Firewall and at least one access point. Your USB adapter is not designed to support lots of devices. It almost certainly has one channel.

It would be fun as an experiment, but often using wifi adapters as an AP generally doesn't work that well. Most of us are running an external AP such as Unifi hardware.

As far as getting this working, have you done the passthrough setup on the VM for the wifi adapter?

And have you confirmed that OpenWRT supports your wifi adapter?

What is the point in installing OpenWRT on something that is not a router? I use it, i have it on a few different WiFi access points...

but what would be the reason to install on a regular pc, whether on VM or not?

Back in the day I ran a pfsense VM on ESXi before broadcom bought them. I found it easier to just purchase a cheap Unifi AP and spin up a VM for the Unifi controller app (I'm assuming you can still run that on your own hardware, its been a few years). I think I got a UAP 6 lite or something like that. If I recall it was about $130 CAD with the PoE injector.

Techincally its not ideal to run your firewall on the same device as other things, but I never had any issues.

Also, does the mini PC have multiple NICs? You will have a bad time if it does not.

I would make sure the adapter you're using (internal or USB) supports AP mode. Most intel ones don't: https://www.intel.com/content/www/us/en/support/articles/000030429/wireless.html

If you do the PCI passthrough Wifi adapter to openwrt, look for name of adaptor and search okpg for in kernel driver for that. Maybe you will face with no driver support, try installing openwrt pre-relase for up to date driver support, or driver only support client mode, Intel Wifi. You can get cheap USB Wifi adapter from Aliexpress that openwrt support but mostly have only one radio so your access point will have one 5Mhz or 2.4Mhz not both at the same time. you can try two adaptor to get both. For supported Wifi adapter and more information https://github.com/morrownr/USB-WiFi?tab=readme-ov-file

id use a pci express or better card with AP mode. openwrt is just minimal linux, so any card that works eith linux works with openwrt.

i use a similar setup than what you want and it works well, you just want to make sure you use passthrough for the wireless and wired cards, and use the correct wifi card.