virtqueue_poll(9)

💖 virtqueue_poll(9) — like, the manual page, but make it make sense 💖

okay so bestie, welcome to virtqueue_poll, which lives in section 9 (the Kernel API Manual, iykyk). This is a tiny little function and honestly it's giving "main character energy" for how much it doesn't do. Let's get into it 🫶

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✨ NAME ✨

virtqueue_poll — query pending used buffers 💅

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🌸 SYNOPSIS 🌸

bool virtqueue_poll (struct virtqueue *_vq , unsigned int last_used_idx
);

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🎀 ARGUMENTS 🎀

• _vq — the struct virtqueue we're talking about. Your queue. Your icon. Your moment.
• last_used_idx — the virtqueue state, which you get from a call to virtqueue_enable_cb_prepare. Yes, that exact one — don't come at me with a different function, it's literally not going to work out 😭

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🦋 DESCRIPTION 🦋

Returns "true" if there are pending used buffers in the queue. That's it. That's the whole vibe check 🔥

This does not need to be serialized. Fr fr — no locking drama, no "hold my hand while I take the mutex" situation. You can just call it. Slay.

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👑 SEE ALSO 👑

The kernel file lives at ./drivers/virtio/virtio_ring.c, and here's the whole friend group — every single one of them, not skipping a single bestie:

• virtqueue_add_sgs(9)
• virtqueue_add_outbuf(9)
• virtqueue_add_outbuf_premapped(9)
• virtqueue_add_inbuf(9)
• virtqueue_add_inbuf_cache_clean(9)
• virtqueue_add_inbuf_ctx(9)
• virtqueue_add_inbuf_premapped(9)
• virtqueue_dma_dev(9)
• virtqueue_kick_prepare(9)
• virtqueue_notify(9)
• virtqueue_kick(9)
• virtqueue_get_buf_ctx(9)
• virtqueue_disable_cb(9)
• virtqueue_enable_cb_prepare(9)
• virtqueue_enable_cb(9)
• virtqueue_enable_cb_delayed(9)
• virtqueue_detach_unused_buf(9)
• vring_interrupt(9)
• virtqueue_resize(9)
• virtqueue_reset(9)
• virtqueue_get_vring_size(9)
• virtqueue_map_alloc_coherent(9)
• virtqueue_map_free_coherent(9)
• virtqueue_map_page_attrs(9)
• virtqueue_unmap_page_attrs(9)
• virtqueue_map_single_attrs(9)
• virtqueue_unmap_single_attrs(9)
• virtqueue_map_mapping_error(9)
• virtqueue_map_need_sync(9)
• virtqueue_map_sync_single_range_for_cpu(9)
• virtqueue_map_sync_single_range_for_device(9)

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literally all of them. every single one. I counted. don't @ me 💀

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and that's the page, bestie 💖 This one came from ./drivers/virtio, dated October 2026, and the whole thing is filed under virtqueue_poll(9) — go forth and poll those buffers, you absolute icon 🌈⭐