RELAY MESSAGE(9)

okay bestie, welcome to the Relay Message(9) page from the Kernel API Manual — it’s giving “small page, very specific driver business.” 💅

✨ Relay Message ✨

So the Relay Message_ is what the Physical Function (PF) driver and the Virtual Function (VF) drivers use to communicate via GuC Relay Communication_. no cap, that’s the whole point.

Format check, bestie: the Relay Message_ follows the format of the generic HXG Message_. literally matching vibes.

       ┌──────────────────────┐
       │     `Relay Message`_ │
       └──────────────────────┘
       +==========================================================================+
       |  `HXG Message`_
       |

Maximum-length tea ☕: the Relay Message_ is limited by the maximum length of the CTB HXG Message_ and by the format of the GUC2PF_RELAY_FROM_VF_ message. periodt.

👀 SEE ALSO 👀

Go peek at these, iykyk:

• Kernel file ./drivers/gpu/drm/xe/abi/guc_relay_communication_abi.h
• GuC Relay Communication(9)
• Relay Error Codes(9)

mwah 💋 — this iconic lil page lives under ./drivers/gpu/drm/xe/abi, dated October 2026, and it’s literally called Relay Message(9). bye bestie 🫶✨