STRUCT VDUSE_IOVA_INFO(9)

💜 struct vduse_iova_info(9) 💜

okay bestie, so this is a page straight out of the Kernel API Manual — struct vduse_iova_info(9), no cap. it's a lil struct that tells you about one IOVA region and honestly? it's giving "small but mighty" energy. ✨

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🌸 NAME 🌸

struct vduse_iova_info — information of one IOVA region 🎀

like, literally. it's the info packet for a single IOVA region. that's the whole vibe.

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🦋 SYNOPSIS 🦋

struct vduse_iova_info {
    __u64 start;
    __u64 last;
  #define VDUSE_IOVA_CAP_UMEM (1 << 0);
    __u64 capability;
    __u32 asid;
    __u32 reserved[5];
 };

copy it exactly, bestie, don't be out here retyping it from memory 😭

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🌈 Members 🌈

• start — the start of the IOVA region. where it all begins 🫶
• last — the last of the IOVA region. the end of the era 💅
• capability — the capability of the IOVA region. what it can do, iykyk ⭐
• asid — the Address space ID of the IOVA region, only if the device API version is >= 1. so like… check your version first, or you're gonna have a bad time 🙈
• reserved — reserved for future use, and it needs to be initialized to zero. not "probably zero", not "zero-ish" — zero, fr fr. the kernel is watching 👀

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✨ Description ✨

so this is the structure used by the VDUSE_IOTLB_GET_INFO ioctl to get information of one IOVA region. that's it, that's the whole job — one ioctl, one region's worth of info, and it ate. 💖

quick vibe check: reserved still has to be zeroed out. future-you (and the kernel) will thank you 🧚

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🎀 SEE ALSO 🎀

the kernel file ./include/uapi/linux/vduse.h and honestly the whole friend group:

• struct vduse_dev_config(9)
• struct vduse_iotlb_entry(9)
• struct vduse_config_data(9)
• struct vduse_vq_config(9)
• struct vduse_vq_state_split(9)
• struct vduse_vq_state_packed(9)
• struct vduse_vq_group_asid(9)
• struct vduse_vq_info(9)
• struct vduse_vq_eventfd(9)
• struct vduse_iova_umem(9)
• struct vduse_iotlb_entry_v2(9)
• enum vduse_req_type(9)
• struct vduse_vq_state(9)
• struct vduse_dev_status(9)
• struct vduse_iova_range(9)
• struct vduse_iova_range_v2(9)
• struct vduse_vq_ready(9)
• struct vduse_dev_request(9)
• struct vduse_dev_response(9)

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and that's the whole page, bestie 🫶 it lives in ./include/uapi/linux, and this edition is dated October 2026. slay, go read your ioctls, ily, bye 💜🦋