cpacf_qai(9)

💅 cpacf_qai(9) — ok bestie, let's talk 💅

so this little icon is from the Kernel API Manual, section 9, and her whole job is literally just: "hey, what auth info does this crypto opcode have, and is it even available?" nosy queen behavior and we love her for it 🎀

✨ NAME ✨

cpacf_qai — get the query authentication information for a CPACF opcode 🕵️‍♀️

🌸 SYNOPSIS 🌸

int cpacf_qai (unsigned int opcode , cpacf_qai_t *qai );

🦋 ARGUMENTS 🦋

• opcode — the opcode of the crypto instruction, like the little ID number that tells everyone which instruction we're talking about 🔢
• qai — honestly? the original docs literally say -- undescribed -- and we're just gonna respect that energy 🙈 (yes, fr fr, that's what it says)

🔥 DESCRIPTION 🔥

okay so what she does is: she executes the query authentication information function for whatever crypto instruction opcode you hand her, and then she checks if func is available. vibe check for your opcode, basically 💅

On success, 1 is returned and the mask gets filled with the query authentication information for this CPACF opcode. Otherwise 0 is returned. iconic boolean behavior, no cap ⭐

👑 SEE ALSO 👑

Kernel file ./arch/s390/include/asm/cpacf.h — and the whole bestie squad:

• cpacf_query(9)
• cpacf_km(9)
• cpacf_kmc(9)
• cpacf_kimd(9)
• cpacf_klmd(9)
• _cpacf_kmac(9)
• cpacf_kmac(9)
• cpacf_kmctr(9)
• cpacf_prno(9)
• cpacf_trng(9)
• cpacf_pcc(9)
• cpacf_pckmo(9)
• cpacf_kma(9)

and that's the whole page, bestie 🫶 she's short, she's sweet, she returns 1 or 0 and she's in ./arch/s390/include/asm, dated October 2026. go forth and query your opcodes 💖✨