VF2GUC_RELAY_TO_PF(9)

💅 VF2GUC_RELAY_TO_PF(9) — Kernel API Manual ✨

okay so bestie, you're looking at VF2GUC_RELAY_TO_PF(9) — yes, that's the manual name, and it's literally giving Kernel API Manual main-character energy. 💖

This message is used by the Virtual Function (VF) drivers to communicate with the Physical Function (PF) driver and send Relay Message_ to the PF driver. See GuC Relay Communication_ for details. 🫶

🚨 Vibe check / actual requirement: this message must be sent over CTB. Like, must must. No cap. 💀

Bits / Description — the 0 chunk, fully preserved, no skipping:

• bit 31 — ORIGIN = GUC_HXG_ORIGIN_HOST_ 👑
• bits 30:28 — TYPE = GUC_HXG_TYPE_REQUEST_ or GUC_HXG_TYPE_FAST_REQUEST_ ✨
• bits 27:16 — MBZ (that's the whole description, bestie)
• bits 15:0 — ACTION = _`XE_GUC_ACTION_VF2GUC_RELAY_TO_PF` = 0x5103 🔥

Payload lineup:

• 1, bits 31:0 — RELAY_ID - VF/PF message ID 🎀
• 2, bits 31:0 — RELAY_DATA1 🌸
• ...
• n, bits 31:0 — RELAY_DATAx 🦋

✨ SEE ALSO ✨

• Kernel file ./drivers/gpu/drm/xe/abi/guc_actions_sriov_abi.h 📁
• GUC2PF_RELAY_FROM_VF(9)
• PF2GUC_RELAY_TO_VF(9)
• GUC2VF_RELAY_FROM_PF(9)
• GUC2PF_ADVERSE_EVENT(9)
• GUC2PF_VF_STATE_NOTIFY(9)
• VF2GUC_MATCH_VERSION(9)
• PF2GUC_UPDATE_VGT_POLICY(9)
• PF2GUC_UPDATE_VF_CFG(9)
• PF2GUC_VF_CONTROL(9)
• VF2GUC_VF_RESET(9)
• VF2GUC_RESFIX_DONE(9)
• VF2GUC_QUERY_SINGLE_KLV(9)
• PF2GUC_SAVE_RESTORE_VF(9)
• VF2GUC_RESFIX_START(9)

okay that's the whole page, bestie 💖 mwah. Footer source/version situation: ./drivers/gpu/drm/xe/abi, dated October 2026, and the manual name still VF2GUC_RELAY_TO_PF(9) — iconic. byeee 🫶✨