hcall_set_ioreq_buffer(9)

📦 version 7.3.1, in nixpkgs unstable

💅 hcall_set_ioreq_buffer(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual page for hcall_set_ioreq_buffer(9) — yes that's the real function name, yes it's a mouthful, no we are not shortening it ✨

🌸 NAME 🌸

hcall_set_ioreq_buffer — literally the function that sets up the shared buffer for I/O Requests. that's the whole vibe. that's the assignment. 🎀

🦋 SYNOPSIS 🦋

long hcall_set_ioreq_buffer (u64 vmid , u64 buffer );

like, she takes two u64s and hands you back a long. icon behavior. 👑

💖 ARGUMENTS 💖

  • vmid — the User VM ID. it's giving "which VM are we talking about" energy. you gotta tell her who she's dealing with 🫶
  • buffer — the Service VM GPA of the shared buffer. yes, GPA as in guest physical address, not your report card, don't panic 💀

⭐ RETURN ⭐

  • 0 on success — slay, it worked, we love a clean zero 💅
  • <0 on failure — not slay, something went sideways, it'll be negative 😭

🌈 SEE ALSO 🌈

first up, the kernel file this whole thing lives in — ./drivers/virt/acrn/hypercall.h 🧚

and then the whole friend group, all of them (9), all of them iconic:

like that's the entire group chat, no cap. go read them next, iykyk 🔥

lowkey a reminder: this page only promises 0 on success and <0 on failure — don't go inventing error codes in your head, bestie 🙈

okay that's the page!! courtesy of ./drivers/virt/acrn, dated October 2026, and honestly she ate 💜 🎀✨

📦 where this page comes from