hcall_assign_mmiodev(9)

💅 hcall_assign_mmiodev(9) — the Kernel API Manual page, bestie edition 🎀

okay so this is a page from the Kernel API Manual, and the function we're simping for today is hcall_assign_mmiodev. Say hi 👋

---

✨ NAME ✨

hcall_assign_mmiodev — literally just assigns a MMIO device to a User VM. that's the whole vibe. no cap. 🦋

---

🌸 SYNOPSIS 🌸

long hcall_assign_mmiodev (u64 vmid , u64 addr );

two u64s in, one long out. she's efficient like that 💅

---

🧚 ARGUMENTS 🧚

• vmid — the User VM ID. which VM are we giving the device to, bestie? 🫶
• addr — the Service VM GPA of the struct acrn_mmiodev. like, the address of it. in the Service VM. the GPA one. 📍

---

⭐ RETURN ⭐

• 0 on success — slay, it worked ✨
• <0 on failure — it's giving error, and honestly? 😭

---

🔥 SEE ALSO 🔥

Kernel file ./drivers/virt/acrn/hypercall.h — go read it, iykyk 📖

the whole hypercall friend group, in order, because they always roll together:

• hcall_sos_remove_cpu(9)
• hcall_create_vm(9)
• hcall_start_vm(9)
• hcall_pause_vm(9)
• hcall_destroy_vm(9)
• hcall_reset_vm(9)
• hcall_set_vcpu_regs(9)
• hcall_inject_msi(9)
• hcall_vm_intr_monitor(9)
• hcall_set_irqline(9)
• hcall_set_ioreq_buffer(9)
• hcall_notify_req_finish(9)
• hcall_set_memory_regions(9)
• hcall_create_vdev(9)
• hcall_destroy_vdev(9)
• hcall_deassign_mmiodev(9) — yes, she has a sister, the deassign one 💜
• hcall_assign_pcidev(9)
• hcall_deassign_pcidev(9)
• hcall_set_ptdev_intr(9)
• hcall_reset_ptdev_intr(9)

---

bestie note: <0 is not a number, it's a feeling. check your return value. 🙈

---

okay that's the whole page, mwah 💖 this one lives in ./drivers/virt/acrn, and it's dated October 2026 — mark your calendar, she's a main character 👑⭐🌈