fpu_enable_...xfd_features(9)

💅 fpu_enable_...xfd_features(9) — like, the whole glow-up

okay so bestie, welcome to the Kernel API Manual ✨ this is the page for fpu_enable_guest_xfd_features, and yes the title is abbreviated with dots because kernel manpage titles are dramatic like that 🎀

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🌸 NAME 🌸

fpu_enable_guest_xfd_features — check the xfeatures against the guest perm and enable them 🦋

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✨ SYNOPSIS ✨

int fpu_enable_guest_xfd_features(struct fpu_guest *guest_fpu, u64 xfeatures);

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🎀 ARGUMENTS 🎀

• guest_fpu — a pointer to the guest FPU container 🫶 literally just the container, she's holding the goods
• xfeatures — the features that the guest CPUID requested 👑 i.e. what the guest is asking for

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💖 DESCRIPTION 💖

Enable all the dynamic xfeatures — and the way it decides is by checking the guest perm against the requested CPUID 😌 so like, permission check first, then the enabling, slay 💅

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🔥 RETURN 🔥

0 on success 🎉 …and an error code otherwise 😭 no in-between, fr fr

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🦋 SEE ALSO 🦋

• Kernel file ./arch/x86/kernel/fpu/core.c — go read the source, iykyk 💜
• fpu_sync_guest_vmexit_xfd_state(9) — her sibling page, iconic, go say hi 🌈

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ok that's the whole thing bestie, no cap 🧚 and just so we're keeping receipts: this one lives in ./arch/x86/kernel/fpu, dated October 2026 — periodt 💅⭐🍓