libkrun-efi: Support upstream virglrenderer

[booxter]

At the moment, one has to pull virglrenderer from slp's fork to build libkrun-efi. It complicates packaging the project (e.g. in nixpkgs). It would be nice to be able to build the library using virglrenderer's upstream release instead.

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I understand the actual "fix" for this issue would (largely) belong to virglrenderer, so consider this issue as a request for clarification for the following:

• Are there any plans to rebase the fork to a latest virglrenderer release?
• Are there any plans to upstream slp fork patches? Were there any attempts to do so? What blocks this from happening?
• (Long shot) Is there anything we can do to help with upstreaming them?

@slp I hope you can clarify this. 🙏

[slp]

Yes, ideally we should find a way to upstream the changes to virglrenderer. The biggest challenge is that, on macOS, we need to run do the rendering in-process, instead of doing it as a separate process. This means we need to consolidate the changes to support both approaches.

This is definitely doable, but requires a significant amount of effort both consolidating the change and discussing the implementation upstream. This is on my TO-DO list, but being honest, is not a high-priority task right now, so I can't say when I'll come to do it.

If someone wants to step up and consolidate the changes themselves I would definitely support them, but they must be aware this isn't an easy task.

[kpouget]

This means we need to consolidate the changes to support both approaches.

ah, glad to learn that. So basically, before anything can be submitted upstream, we must ensure that the Linux version works again 🤔