kvm_get_badinstrp(9)

🎀 NAME 🎀

hiii bestie 💖 welcome to kvm_get_badinstrp(9), a lil page from the Kernel API Manual. The name says it all: kvm_get_badinstrp — Get bad prior instruction encoding. no cap, that's the whole vibe.

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✨ SYNOPSIS ✨

okay so here's the signature, copied exactly because we do not mess with code:

int kvm_get_badinstrp (u32 *opc , struct kvm_vcpu *vcpu , u32 *out );

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🦋 ARGUMENTS 🦋

• opc — guest pointer to the prior faulting instruction. yes ma'am, a guest pointer.
• vcpu — KVM VCPU information. that's the vcpu bestie 🫶.
• out — the original page literally says -- undescribed --, so that's all we've got 😭. no invented lore here.

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🌸 DESCRIPTION 🌸

okay so what does it do? It gets the instruction encoding of the prior faulting instruction — specifically the branch containing the delay slot which faulted — using the saved BadInstrP register value if it exists; otherwise it falls back to reading guest memory at opc. that's it, that's the tea ☕✨ fr fr.

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💅 RETURN 💅

it returns the instruction encoding of the prior faulting instruction. iconic behavior, honestly 👑 periodt.

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🐚 SEE ALSO 🐚

Kernel file ./arch/mips/kvm/emulate.c, plus these besties:

• kvm_get_badinstr(9)
• kvm_mips_count_disabled(9)
• kvm_mips_ktime_to_count(9)
• kvm_mips_count_time(9)
• kvm_mips_read_count_running(9)
• kvm_mips_read_count(9)
• kvm_mips_freeze_hrtimer(9)
• kvm_mips_resume_hrtimer(9)
• kvm_mips_restore_hrtimer(9)
• kvm_mips_write_count(9)
• kvm_mips_init_count(9)
• kvm_mips_set_count_hz(9)
• kvm_mips_write_compare(9)
• kvm_mips_count_disable(9)
• kvm_mips_count_disable_cause(9)
• kvm_mips_count_enable_cause(9)
• kvm_mips_set_count_ctl(9)
• kvm_mips_set_count_resume(9)
• kvm_mips_count_timeout(9)

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mwah 💖 that’s the whole page, bestie — it comes from ./arch/mips/kvm and is dated October 2026. 🫶