On Tue, 15 Mar 2022 at 20:23, Alyssa Ross <hi@alyssa.is> wrote:
On Tue, Mar 15, 2022 at 02:06:04PM +0000, Alyssa Ross wrote:
On Sun, Mar 13, 2022 at 03:08:04PM +0000, Thomas Leonard wrote:
[ virtio-gpu ]
I'm happy to test it now with Linux 5.16, but I think I need a newer crosvm too. Looks like support got added in https://github.com/google/crosvm/commit/231a54f36fbfb90ebac152d66f937af3644f..., so it should be in 94.14150.
Is there a new-enough package for crosvm available somewhere? NixOS only has 81.12871.0.0-rc1, and spectrum seems to be on 91.13904.0.0-rc2.
I don't know of one. I haven't been keeping it up to date since we've mostly switched over to cloud-hypervisor for Spectrum, but it doesn't have any way of doing virtio-gpu (yet, porting crosvm's vhost-user-gpu implementation is on my list).
I'll have a go at updating it in Nixpkgs and report back.
Okay, here's a package for crosvm 99.14468.0.0-rc1: https://github.com/NixOS/nixpkgs/pull/164306
Thanks - that's very useful! Testing it from NixOS stable, it crashed with [ERROR:src/linux.rs:3264] child pcivirtio-block (pid 47933) died: signo 17, status 11, code 2 In the journal, I saw: [src/panic_hook.rs:90] thread 'virtio_blk' panicked at 'Failed to create an executor: Uring(CreatingContext(Setup(12)))', devices/src/virtio/block/asynchronous.rs:767:50 From a brief look at the code, it looks like crosvm sees that the host is running Linux >= 5.10 and creates a test uring, which works. Then it tries to create a real one, and that fails. I fixed it by increasing the limit on locked memory in configuration.nix: security.pam.loginLimits = [ { domain = "*"; type = "-"; item = "memlock"; value = "64000"; } ]; Then my VM booted and worked as before.
I've tested some basic stuff, but haven't tested virtio-gpu. I don't see any reason it wouldn't work, though.
I tried running with `crosvm --gpu`, but after `modprobe virtio-gpu`, crosvm crashed with: [ 31.326763] Invalid ELF header magic: != ELF [ 31.331450] [drm] pci: virtio-gpu-pci detected at 0000:00:07.0 [ 31.333020] [drm] Host memory window: 0x200000000 +0x200000000 [ 31.333983] [drm] features: +virgl -edid +resource_blob +host_visible [ 31.333984] [drm] features: +context_init [ 31.337289] [drm] number of scanouts: 1 [ 31.337938] [drm] number of cap sets: 1 [ERROR:src/linux.rs:3264] child pcivirtio-gpu (pid 63446) died: signo 17, status 11, code 2 [ERROR:devices/src/proxy.rs:212] failed write to child device process pcivirtio-gpu: failed to send packet: Broken pipe (os error 32) Then I tried with `--gpu=backend=2d` and that didn't crash, but instead opened a window showing some bootloader stuff. I now have /dev/dri/{card0, renderD128} devices, so I guess the next step is figuring out what they do!
Good luck! Let me know if I can help with anything else.
If you happen to know of any documentation, that would be great. But I guess I probably just need to spend a load of time reading crosvm, Linux, and Sommelier source code. -- talex5 (GitHub/Twitter) http://roscidus.com/blog/