I've been kicking around the idea of adding another request type to VMMDev that exposes an opaque chunk of data provided by the user. This is intended to allow users to pass configuration data to guests which support reading from this interface.
At CoreOS, we are working on a project called Ignition [1], which handles machine provisioning tasks (setting up filesystems, creating users, enabling services, etc.). In order to support VirtualBox, we need a way for users to pass their Ignition config to the CoreOS Linux guest (ideally via the hypervisor). We do this via GuestVariables on VMware and the firmware configuration device on QEMU. I couldn't find anything in VirtualBox which would allow us similar functionality. I'd like to add an extra request handler to expose just this piece of information. I had considered making a much more general mechanism, similar to GuestVariables, but I'd prefer to keep things simple and get the developers' feedback before I started work. What do you all think? -Alex [1]: https://coreos.com/ignition
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