KVM enabled?

[kyr0]

Do I see it correctly that KVM is enabled?

https://github.com/AsahiLinux/linux/blob/asahi/arch/arm64/configs/defconfig#L110

Or is this configuration overwritten somewhere?

Sry, I'm a bit out of kernel stuff since a few years. Need some time to get back to this business

Because if that works and qemu compiles and runs well (yeah, yeah, the 16k page size fun), we'd be able to run KVM acceleration enabled qemu on an M1?

https://community.arm.com/oss-platforms/w/docs/510/spawn-a-linux-virtual-machine-on-arm-using-qemu-kvm

[jannau]

Please do not use github issues as discussion forum.

qemu with kvm works well out of the box on M1 Pro/Max/Ultra. On the original M1 it needs an unreleased qemu version to work well out of the box. It work afaik with higmem=off 16k page size is not a problem for qemu.

[kyr0]

You're right, thank you. On top of that (I tested and verified it yesterday night), it runs SerenityOS without any problems.
However KVM support wasn't working by default but I guess that is out of scope here as it is an issue about what qemu system binary to use in regards to pure ARM KVM support.

Leaving it here for reference for whenever someone has the same "issue": https://community.arm.com/oss-platforms/w/docs/510/spawn-a-linux-virtual-machine-on-arm-using-qemu-kvm

I'll probably fix/PR the issue for SerenityOS (guest) so that it makes use of KVM functionality when running on Ashai (host); specifically if/else case needs to be added for using qemu-system-aarch64 with qemu on Ashai; https://github.com/SerenityOS/serenity/blob/master/Meta/run.sh#L38

I'll just report back tonight if that worked but it's fine if we close this issue right now. Thank you

[pimpmypicture]

Regarding initial question, qemu 7.0 brought compatibility with KVM on original M1.

Alas, a bug was found when enabling smp (https://gitlab.com/qemu-project/qemu/-/issues/1002).
There is a workaround but you must compile qemu yourself (and revert a specific commit).

[pbo-linaro]

Regarding previous message, is seems like KVM currently does not support a cpu having two different kind of cores (like M1).
Full details: https://gitlab.com/qemu-project/qemu/-/issues/1002#note_933186950

So reverting the commit on qemu does not really solve the original problem (only a part of it).