AMP Virtio: A New Virto Transport for AMP Systems, with Focus on Zephyr, Linux, and Xen
summary
A new Virtio transport implements OpenAMP-style shared memory plus bidirectional notifications, with prototypes for Zephyr, Linux and Xen and a desktop simulation using dual QEMU with IV shared memory and MSI doorbells. It targets AMP topologies (Cortex‑A Linux + Cortex‑M Zephyr, PCIe root‑complex/endpoint, non‑transparent bridges) to reduce worst‑case latency and increase freedom from interference. The project shifts from MMIO tricks toward a message‑based transport replacing MMIO emulation and documents kernel/driver memory and coherency workarounds.
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