openvmm: Add consomme, virtio-console and serial connect to ttrpc interface

[damanm24]

This PR extends the ttrpc VM service interface with three new capabilities:

1. Virtio console device backed by UDS or named pipe
2. Consommé NIC backend
3. Adds a connect option for serial and virtio console devices so that openvmm can connect to a pre-existing socket/pipe as a client

These new capabilities are utilized by a new workstream/proof-of-concept work to use OpenVMM as the VMM backend for WSLC.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Extends the OpenVMM ttrpc VM service API to support virtio-console, a Consommé NIC backend, and “connect-as-client” semantics for serial/console backends.

Changes:

• Add VirtioConsoleConfig and a connect flag for serial/virtio-console endpoints in the VM service proto.
• Add virtio-console device creation in the ttrpc entry, backed by UDS/named pipe (bind or connect).
• Add Consommé as a NIC backend option and map it into net_backend_resources.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
openvmm/openvmm_ttrpc_vmservice/src/vmservice.proto	Adds proto messages/fields for virtio-console, Consommé backend, and connect semantics.
openvmm/openvmm_entry/src/ttrpc/mod.rs	Implements connect/bind selection for serial + new virtio-console plumbing and Consommé NIC parsing.
openvmm/openvmm_entry/src/serial_io.rs	Adds connect_serial to connect to pre-existing pipe/socket endpoints.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.