virtio_device_ready(9)

💅 virtio_device_ready — bestie's guide to waking up ur vqs

ok so this is a page from the Kernel API Manual, section 9 (the kernel interfaces girlies), and it's about virtio_device_ready. lowercase name, main character function, let's GO 🫶

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✨ NAME ✨

virtio_device_ready — enable vq use in probe function 🌸

like literally that's the whole job. enable vq use. in the probe function. no notes. 💅

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🌈 SYNOPSIS 🌈

void virtio_device_ready (struct virtio_device *dev );

that's it. that's the whole signature. void in, void out, no return value, no drama, no error codes to check. iconic behaviour honestly ✨

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🎀 ARGUMENTS 🎀

• dev — the virtio device 💖 (yes that's the entire description, she's a simple girl, she just wants her virtio device)

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🦋 DESCRIPTION 🦋

ok so LISTEN. the driver must call this to use vqs in the probe function. not "should", not "maybe if u feel like it" — must. 🫶

so if ur sitting there in ur probe function like "hmm why can't I touch my virtqueues yet 😭" — it's because u didn't call virtio_device_ready first. that's the whole vibe check. call it, then ur vqs are usable inside probe. periodt. 🔥

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💀 NOTE 💀

vqs are enabled automatically after probe returns ✨

so like… yes, they do get turned on for u eventually. but if u need them during probe? that's a u problem and u need virtio_device_ready, bestie. no cap. 🎀

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🔍 SEE ALSO 🔍

the lore continues in Kernel file ./include/linux/virtio_config.h 📁 — go read it, it's giving essential context:

• struct virtqueue_info(9)
• struct virtio_config_ops(9)
• struct virtio_map_ops(9)
• __virtio_test_bit(9)
• __virtio_set_bit(9)
• __virtio_clear_bit(9)
• virtio_has_feature(9)
• virtio_has_dma_quirk(9)
• virtio_synchronize_cbs(9)
• virtqueue_set_affinity(9)

that's ten whole cross-references, we ate 💅✨

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and that's the page!! mwah 💖

cute little sign-off: this one lives in ./include/linux, dated October 2026, and it's page virtio_device_ready(9) of the Kernel API Manual — go call her before u touch a vq in probe, ily, bye 🧚‍♀️⭐