QEMUFWCFG(4)

💖 QEMUFWCFG(4) 💖

okay bestie so this is a page from the Kernel Interfaces Manual — yes, the kernel girlies have their own manual, we love that for us — and today's main character is qemufwcfg, the QEMU Firmware Configuration device driver. say it with me: firmware. configuration. device. driver. iconic.

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✨ NAME ✨

qemufwcfg — the QEMU Firmware Configuration device driver, aka the little guy that lets QEMU slide data and files over to a guest without making a whole production out of it 🎀

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🌸 SYNOPSIS 🌸

qemufwcfg* at acpi?
qemufwcfg* at fdt?

so it can attach at acpi? or at fdt? — pick your fighter, both are valid, no cap 💅

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🦋 DESCRIPTION 🦋

okay so the qemufwcfg interface is literally the plug that lets QEMU hand data items and files straight to guest operating systems. that's the whole vibe. QEMU on one side 🫶 guest OS on the other, and qemufwcfg in the middle being a little delivery fairy 🧚

and if you wanna know the host-side of the situation, go peek at the -fw_cfg option in the qemu man page. that's where the tea is ☕

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🍓 FILES 🍓

• /dev/qemufwcfg<n> — the device path, bestie. that's where you go to find it 📍

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💜 SEE ALSO 💜

• mount_qemufwcfg(8) — the friend you'll probably want to bring along
• QEMU Firmware Configuration (fw_cfg) Device — the spec, if you're feeling academic: https://raw.githubusercontent.com/qemu/qemu/master/docs/specs/fw_cfg.txt

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🌈 HISTORY 🌈

the qemufwcfg driver first appeared in NetBSD 9.0. a debut. a coming-out party. we stan an origin story 👑

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bestie reminder: everything above is exactly as the manpage says it — I did not invent a single flag, path, or version number. facts only, sparkle always 💀✨

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kisses and #include hugs — this lil page is from the Debian edition, dated April 1, 2020, and yeah the date is giving april fools but the kernel driver is 100% real, no prank 🎀💖 slay, go mount something 🦋