entry_fn_t(9)

💫 entry_fn_t(9) — like, the Kernel API Manual page, bestie 💫

okay so picture this: you're deep in the kernel, you're restoring a table, and something needs to happen for every single entry. that something? it's this callback. entry_fn_t is literally the callback that gets called on a table entry restore path. no cap. 🎀

---

✨ NAME ✨

entry_fn_t — the callback that gets called on a table entry restore path. yes that's the whole vibe. it's giving "small but crucial". 👑

---

🌸 SYNOPSIS 🌸

int entry_fn_t (struct vgic_its *its , u32 id , void *entry , void
*opaque );

literally just one function signature, but she's iconic. 🦋

---

💅 ARGUMENTS 💅

• its — the its handle. your main character struct, fr fr. 💖
• id — the id of the entry. gotta know which one we're talking about, obviously. ⭐
• entry — pointer to the entry. this is the actual thing, the moment, the whole point. 🌈
• opaque — pointer to an opaque data. mysterious. unknowable. we love her. 🙈

---

🔥 RETURN 🔥

okay so the return value is doing a little three-way thing and you need to know all three, iykyk:

• < 0 — on error. it went wrong. 😭
• 0 — if the last element was identified. we're done here, periodt. ✅
• id offset to next element — otherwise, this is your little breadcrumb to the next element. keep going bestie. 🫶

---

🧚 SEE ALSO 🧚

go read these, they're all lowkey connected and honestly kind of a friend group:

• Kernel file ./arch/arm64/kvm/vgic/vgic-its.c — the source file herself 💜
• struct vgic_its_abi(9)
• vgic_its_invall(9)
• scan_its_table(9)
• vgic_its_restore_ite(9)
• vgic_its_restore_itt(9)
• vgic_its_save_dte(9)
• vgic_its_restore_dte(9)
• handle_l1_dte(9)

---

ngl bestie, if you're touching the restore path, you're gonna want the whole little squad above. read them together, it hits different. 🍓

---

and that's the page!! 🎀 this one lives in ./arch/arm64/kvm/vgic, dated October 2026 — screenshot it, cite it, frame it, slay. 💅✨