Hi Alex,

Em Tue, 27 May 2025 23:03:39 +0900
Alexandre Courbot [off-list ref] escreveu:

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Btw, I was looking at:

        https://github.com/chromeos/virtio-media

(I'm assuming that this is the QEMU counterpart, right?)  

crosvm actually, but QEMU support is also being worked on.  

Do you have already QEMU patches? The best is to have the Kernel driver
submitted altogether with QEMU, as Kernel developers need it to do the
tests. In my case, I never use crosvm, and I don't have any Chromebook
anymore.  

IIRC Albert Esteve was working on this, maybe he can share the current status.

Any news regards to it?

Note that crosvm does not require a Chromebook, you can build and run
it pretty easily on a regular PC. I have put together a document to
help with that:

https://github.com/chromeos/virtio-media/blob/main/TRY_IT_OUT.md

I started looking on it today. Already installed crossvm (I had to
install libcap-devel to build it). Still, I'm not familiar with
crossvm, which is a little be painful. In particular, how can I
enable network on it and speedup it? With suggested parameters,
it picked only one CPU, and very few memory on it:

	# cat /proc/cpuinfo|grep processor
	processor       : 0

	# free
               total        used        free      shared  buff/cache   available
	Mem:          221876       34780      139712         272       56096      187096
	Swap:              0           0           0

I'd like to be able to compile things on it and use ssh/scp. So,
the VM needs more CPUs, more memory, more network and GPU.

Btw, on a quick test with v4l2-compliance, something looks weird:
I started a camera application at the host. Still, v4l2-compliance
said successfully excecuted mmap:

Streaming ioctls:
        test read/write: OK (Not Supported)
        test blocking wait: OK
        test MMAP (no poll): OK                           
        test MMAP (select): OK                            
        Vide[2025-06-17T08:44:49.177972817+00:00 ERROR virtio_media::ioctl] VIDIOC_REQBUFS: memory type DmaBuf is currently unsupported
[2025-06-17T08:44:49.178164554+00:00 ERROR virtio_media::ioctl] VIDIOC_REQBUFS: memory type DmaBuf is currently unsupported
o Capturtest MMAP (epoll): OK                             
        test USERPTR (no poll): OK (Not Supported)
        test USERPTR (select): OK (Not Supported)
        test DMABUF (no poll): OK (Not Supported)
        test DMABUF (select): OK (Not Supported)

Which doesn't make any sense, as the host OS should not allow access
to mmap while streaming.

Thanks,
Mauro