VFIO_CHECK_EXTENSION(9)

✨ VFIO_CHECK_EXTENSION 💅

okay so this is a page from the Kernel API Manual, and the star of the show is VFIO_CHECK_EXTENSION — literally the vibe check for VFIO extensions 🦋

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🌸 NAME 🌸

VFIO_CHECK_EXTENSION — bestie, it's _IOW(VFIO_TYPE, VFIO_BASE + 1, __u32)

like, that's the whole ioctl incantation, no cap ✨

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🎀 SYNOPSIS 🎀

VFIO_CHECK_EXTENSION

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💖 DESCRIPTION 💖

It checks whether an extension is supported. That's it. That's the function 🫶

lowkey the most straightforward icon in the whole VFIO friend group — it just looks at an extension and goes "supported? not supported?" and moves on 💅

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⭐ RETURN ⭐

• 0 — not supported 🙈
• 1 (or some other positive integer) — supported, slay 👑

Availability: Always. Like, always always. It's giving reliable main character energy 🔥

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🦋 SEE ALSO 🦋

Kernel file ./include/uapi/linux/vfio.h — go read it, iykyk 📖

and the whole friend group:

• VFIO_GET_API_VERSION(9)
• VFIO_SET_IOMMU(9)
• VFIO_GROUP_SET_CONTAINER(9)
• VFIO_GROUP_UNSET_CONTAINER(9)
• VFIO_GROUP_GET_DEVICE_FD(9)
• struct vfio_region_gfx_edid(9)
• VFIO_DEVICE_RESET(9)
• VFIO_DEVICE_GET_GFX_DMABUF(9)
• VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY(9)

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okay that's the page!! mwah 💋 — brought to you from ./include/uapi/linux, dated October 2026, and logged in the manual as VFIO_CHECK_EXTENSION(9). go check some extensions bestie, you got this 🌈💜