vringh_init_iotlb_va(9)

✨ vringh_init_iotlb_va ✨

okay so bestie, this page is from the Kernel API Manual (section 9, the kernel-API girlies 💅), and it's all about vringh_init_iotlb_va — the function that gets a vringh all set up for a ring whose IOTLB is holding user VA. yep, that's the whole vibe. let's get into it 🫶

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🌸 SYNOPSIS 🌸

int vringh_init_iotlb_va (struct vringh *vrh , u64 features , unsigned
int num , bool weak_barriers , struct vring_desc *desc , struct
vring_avail *avail , struct vring_used *used );

like, look at her. seven whole arguments. main character energy fr fr 👑

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🎀 ARGUMENTS 🎀

• vrh — the vringh you're initializing. this is the glow-up recipient 💖
• features — the feature bits for this ring. u64, so there's room for days.
• num — how many elements. the headcount. the guest list 🎟️
• weak_barriers — a bool; true if we only need memory barriers, not I/O. lowkey the important distinction here.
• desc — the userspace descriptor pointer.
• avail — the userspace avail pointer.
• used — the userspace used pointer. yes, all three, and yes, they all have to be userspace pointers. no substitutions 🙈

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🦋 DESCRIPTION 🦋

so what does she actually do? she sets up your vringh for a ring with an IOTLB that contains user VA. iconic. she's literally just returning an error if num is invalid — that's the one behavior note we got, and ngl it's a real one, so don't skip your validation bestie 😭

not a single extra claim in here, i'm just telling you what the page tells you — num bad = error, periodt.

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⭐ SEE ALSO ⭐

okay this list is long and honestly? she ate. it's all the vringh girlies across user, kern, and iotlb flavors 💜

• Kernel file ./drivers/vhost/vringh.c
• vringh_kiov_advance(9)
• vringh_init_user(9)
• vringh_getdesc_user(9)
• vringh_iov_pull_user(9)
• vringh_iov_push_user(9)
• vringh_complete_user(9)
• vringh_complete_multi_user(9)
• vringh_notify_enable_user(9)
• vringh_notify_disable_user(9)
• vringh_need_notify_user(9)
• vringh_init_kern(9)
• vringh_getdesc_kern(9)
• vringh_complete_kern(9)
• vringh_notify_enable_kern(9)
• vringh_notify_disable_kern(9)
• vringh_need_notify_kern(9)
• vringh_init_iotlb(9)
• vringh_set_iotlb(9)
• vringh_getdesc_iotlb(9)
• vringh_iov_pull_iotlb(9)
• vringh_iov_push_iotlb(9)
• vringh_complete_iotlb(9)
• vringh_need_notify_iotlb(9)

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💀 quick warning-ish aside: the page genuinely doesn't say what happens beyond "returns an error if num is invalid", so don't go inventing extra guarantees in your head, bestie. iykyk.

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🧚 sign-off 🧚

and that's the page! she lives in ./drivers/vhost, she's dated October 2026, and she's serving the Kernel API Manual realness from start to finish. go forth and initialize your IOTLB-VA ring, you gorgeous nerd 🌈💖✨