kvm_inject_undefined(9)

✨ kvm_inject_undefined ✨

okay so real talk, this one lives in the Kernel API Manual (section 9, kernel-space royalty 👑) and it's literally the "throw a wobbly at the guest" button. Let's get into it 💅

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🌸 NAME 🌸

kvm_inject_undefined — inject an undefined instruction into the guest 🫶

like, you're telling the guest "bestie, that instruction? doesn't exist. never did. xoxo" 💀

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🦋 SYNOPSIS 🦋

void kvm_inject_undefined (struct kvm_vcpu *vcpu );

no cap, that's the whole signature. clean. iconic. eats every time ✨

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🎀 ARGUMENTS 🎀

• vcpu — The vCPU in which to inject the exception 🌈 this is the main character right here, the virtual CPU that's about to have A Moment 🙈

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💖 DESCRIPTION 💖

so here's the vibe check: it is assumed that this code is called from the VCPU thread, and that the VCPU therefore is not currently executing guest code. 🧚

read that again, bestie, because it's the whole entire point — no calling this from some random thread while the vCPU is off doing guest things, that's not the vibe, that's a setup for chaos 😭 the assumption is baked in, so respect it fr fr.

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⭐ SEE ALSO ⭐

• Kernel file ./arch/arm64/kvm/inject_fault.c 🍓 (go read the source, it's giving lore)
• kvm_inject_dabt_excl_atomic(9) 💜 (the sibling, the costar, the other injector)

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lowkey reminder: the "called from the VCPU thread" thing in DESCRIPTION isn't decoration, it's the whole contract, so don't be out here violating it 👀

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and that's the page!! 💅 brought to you by the ./arch/arm64/kvm girlies, dated October 2026, straight out of the Kernel API Manual — mwah, go inject responsibly 🎀✨🦋