Waydroid support - full kernel config

an7h · Tux's lil' helper Joined: 10 Jan 2018 Posts: 89

I was messing around for a quite a bit to get this piece of unsupported software running under Gentoo Linux (which I emerged from the guru overlay). The biggest problem I encountered was dealing with setting up my custom kernel config correctly so that it supports functionality Waydroid expects from it. As an a easy solution you can just get the sys-kernel/gentoo-kernel or gentoo-kernel-bin package and be done with it, but I'm one of those people that likes to optimize things as much as possible with a custom kernel configuration (hence I use Gentoo). So, for those who need this piece of software, here's a list of things that should be enabled/disabled within the kernel to get Waydroid working with full functionality. Hope this will be useful to someone out there, so that they won't spend time on looking for info on what needs to be enabled/disabled to get it to work, because the official documentation doesn't mention any of this (except for like one or two options).

>=sys-kernel/gentoo-sources-6.5.7 :

papu · Posted: Tue Nov 14, 2023 2:14 am Post subject:

hi,
I like to mark M if is eligible,
it is a must the Y to get working waydroid?,

today I was trying to use waydroid but i can't,

do you use openrc? me yes,
config_cgroup_bpf depens on a kernel systemd option

Selected by [n]: - GENTOO_LINUX_INIT_SYSTEMD [=n] && GENTOO_LINUX [=y] && GENTOO_LINUX_UDEV [=y]

thanks.
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Hu · Moderator Joined: 06 Mar 2007 Posts: 21635

an7h · Tux's lil' helper Joined: 10 Jan 2018 Posts: 89

Zucca · Posted: Tue Nov 14, 2023 6:01 pm Post subject:

If this information isn't yet on wiki, please consider adding it. Thank you.
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papu · Posted: Tue Nov 14, 2023 10:50 pm Post subject:

papu · Posted: Tue Nov 14, 2023 10:57 pm Post subject:

an7h · Tux's lil' helper Joined: 10 Jan 2018 Posts: 89

@papu
That's something already. When I was figuring this stuff out, I couldn't get passed some sort of netfilter script trying to start for a long time, before I got at least the window of Waydroid popping up.

Yet, something is still missing in your kernel by the looks of it, but I can't really tell hat exactly. Try doing a test with sys-kernel/gentoo-kernel-bin just to confirm this is an issue with the kernel. Also I'd like to point out that I've got all those modules required by waydroid as built into the kernel itself and it works fine. I haven't really tested with mostly modules... theoretically it shouldn't be a problem, really... but you might want to try building them into the kernel instead.

You can also check the log with the command waydroid log and post it here. It could help pinpoint what's wrong.

If it'll work with sys-kernel/gentoo-kernel-bin, but not with your custom kernel and built-in modules, then I'll recheck the full list of required options that should be enabled/disabled and make sure nothing above is missing here.The stuff I posted above is just what should be enabled for the gentoo kernel.
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papu · Posted: Thu Nov 16, 2023 11:45 am Post subject:

an7h · Tux's lil' helper Joined: 10 Jan 2018 Posts: 89

papu · Posted: Fri Nov 17, 2023 2:07 am Post subject:

finally I maked it works , there was a problem with the net , I had no internet iinside waydroid, i figure out the options for that, and now i have internet:

an7h · Tux's lil' helper Joined: 10 Jan 2018 Posts: 89

@papu
I checked and those options are enabled by default in the latest sys-kernel/gentoo-sources (6.6.1). Looks like this is something that you disabled yourself earlier.
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papu · Posted: Sat Nov 18, 2023 11:47 am Post subject:

an7h · Tux's lil' helper Joined: 10 Jan 2018 Posts: 89

@papu
Yeah, I hear ya. I disable as much as possible as well to make the kernel smaller. Glad you figured it out, and yes, I agree, it seems waydroid needs more time to mature. At least it's good enough for my use case. It actually makes me want to try out a linux phone again. It's something that is pretty major for such a device, considering the lack of mobile optimized software on those things.

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CaptainBlood · Advocate Joined: 24 Jan 2010 Posts: 3628

Nice thread.
I have a basic kernel setting that tries to mach hardware feature.
When a new feature is required I template the previous with another CONFIG_LOCALVERSION.

Despite it has drawbacks I favor <M> when possible.

Will likely seed another kernel for waydroid sooner or later, as far as I can tell.

Thks 4 ur attention, interest & support.
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mojyack · n00b Joined: 03 Jan 2024 Posts: 1 Location: Japan

I got Waydroid working on a custom minimal kernel, so I'll share the information.
I think these kernel options are required:

Zucca · Posted: Sat Jan 06, 2024 9:23 pm Post subject:

I guess I could drop that in /etc/kernel/config.d. Needs a little sed/awk to be compatible, but that's not a problem.
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