Re: Hermetic virtio-vsock in QEMU

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Apr 03, 2024 at 02:30:33PM -0700, Roman Kiryanov wrote:
> Hi Peter, Alex and QEMU,
> 
> I work in Android Studio Emulator and we use virtio-vsock to emulate
> devices (e.g. sensors) which live in the Emulator binary. We need to run on
> Windows and in environments without CONFIG_VHOST_VSOCK, that is why we
> cannot use vhost-vsock and invented our implementation. I tried to grep the
> QEMU8 sources and I believe virtio-vsock is not available there.
> 
> Do you think it is a good idea to implement virtio-vsock in QEMU (e.g. to
> run on Windows)? If the answer is yes, could you please point where I could
> start to build an upstreamable solution (not Android Emulator specific)? It
> is not clear to me how we should make the device available for clients
> (sensors, modem, adb, etc) in a generic way.

This issue is proposing the idea of exposing VSOCK using AF_UNIX as the
host backend, in a manner that's compatible with that used by firecracker
and cloud-hypervisor:

  https://gitlab.com/qemu-project/qemu/-/issues/2095

Recent versions of Windows support AF_UNIX these days, so hopefully that
would be satisfactory as an approach ?

With regards,
Daniel
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