vhost_vq_set_backend(9)

💅 NAME 💅

vhost_vq_set_backend — okay so bestie, this one sets the backend. That's literally it, that's the whole job. ✨

(Yes, this is a section 9 kernel API manual page, and yes, it is serving main character energy for the vhost subsystem. iykyk.)

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🦋 SYNOPSIS 🦋

void vhost_vq_set_backend (struct vhost_virtqueue *vq , void
*private_data );

Two args, one void return, zero drama. Slay. 🫶

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🌸 ARGUMENTS 🌸

• vq — ngl, the manpage just says -- undescribed -- here. That's it. That's the whole description. No cap, nobody wrote anything for this one. 😭
• private_data — same situation bestie, it's -- undescribed --. The docs said "we'll fill this in later" and then never did. Iconic behavior honestly. 💀

Lowkey a vibe check failure on the documentation side, but the signature is fully there, so at least you know what to pass. 🙈

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🎀 DESCRIPTION 🎀

Let's break it down like a group chat:

• vq — this is the Virtqueue. The virtqueue. The main character. 🔥
• private_data — this is the private data. That's the whole explanation, and honestly? It ate. Short, sweet, to the point. 💅

So, fr fr: you hand it a virtqueue, you hand it some private data, and it sets the backend. Nothing else invented here — this page is a minimalist queen. 👑

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⭐ CONTEXT ⭐

Okay this part matters, so listen up:

You need to call this with vq->mutex acquired. 🔒

Like, not optional. Not "oh I'll grab it later". Acquire that mutex first, then call. Do not skip this step, bestie, that's how you get cursed concurrency bugs and undefined behavior and a very sad kernel. 😭💀

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🌈 SEE ALSO 🌈

• The kernel file ./drivers/vhost/vhost.h — go read it, the header is right there 🦋
• vhost_vq_get_backend(9) — the getter to this setter's... well, setter. They're a matching set, adorable. 💖

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🍓 a lil sign-off 🍓

This page lives under ./drivers/vhost (home sweet home 🏠), it's stamped October 2026, and the manual is vhost_vq_set_backend(9) across the board — same in the corner as it was at the top. Periodt. 💜🧚