ibmvmc_ioctl_sethmcid(9)

💅 ibmvmc_ioctl_sethmcid — like, the Kernel API Manual page, bestie 🎀

okay so real talk, this is ibmvmc_ioctl_sethmcid(9) from the Kernel API Manual, and it's literally the ioctl that sets your HMC ID. tiny page, big main-character energy, let's go ✨

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✨ NAME ✨

ibmvmc_ioctl_sethmcid — IOCTL Set HMC ID 💖

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🌸 SYNOPSIS 🌸

long ibmvmc_ioctl_sethmcid (struct ibmvmc_file_session *session ,
unsigned char __user *new_hmc_id );

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🦋 ARGUMENTS 🦋

• session — the ibmvmc_file_session struct, no cap, that's the whole vibe of it 🫶
• new_hmc_id — the HMC id field, this is the actual thing you're setting, periodt 💅

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⭐ DESCRIPTION ⭐

so this is the IOCTL command to setup the hmc id. that's it. that's the whole description. iconic of it honestly 👑

ngl it's giving "small but crucial" — if you're in here you already know why you need it iykyk 🔥

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🌈 RETURN 🌈

• 0 — Success 🎉
• Non-zero — Failure 😭

bestie please actually check the return value, I'm begging 🙈

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💜 SEE ALSO 💜

the kernel file is ./drivers/misc/ibmvmc.c — that's where all the lore lives, go read it fr fr 📖

and here's the whole extended friend group, every single one of them, not skipping a single name because we don't do that here 💖:

• h_request_vmc(9)
• ibmvmc_handle_event(9)
• ibmvmc_release_crq_queue(9)
• ibmvmc_reset_crq_queue(9)
• crq_queue_next_crq(9)
• ibmvmc_send_crq(9)
• alloc_dma_buffer(9)
• free_dma_buffer(9)
• ibmvmc_get_valid_hmc_buffer(9)
• ibmvmc_get_free_hmc_buffer(9)
• ibmvmc_free_hmc_buffer(9)
• ibmvmc_count_hmc_buffers(9)
• ibmvmc_get_free_hmc(9)
• ibmvmc_return_hmc(9)
• ibmvmc_send_open(9)
• ibmvmc_send_close(9)
• ibmvmc_send_capabilities(9)
• ibmvmc_send_add_buffer_resp(9)
• ibmvmc_send_rem_buffer_resp(9)
• ibmvmc_send_msg(9)
• ibmvmc_open(9)
• ibmvmc_close(9)
• ibmvmc_read(9)
• ibmvmc_poll(9)
• ibmvmc_write(9)
• ibmvmc_setup_hmc(9)
• ibmvmc_ioctl_query(9)
• ibmvmc_ioctl_requestvmc(9)
• ibmvmc_ioctl(9)
• ibmvmc_add_buffer(9)
• ibmvmc_rem_buffer(9)
• ibmvmc_process_capabilities(9)
• ibmvmc_validate_hmc_session(9)
• ibmvmc_reset(9)
• ibmvmc_reset_task(9)
• ibmvmc_process_open_resp(9)
• ibmvmc_process_close_resp(9)
• ibmvmc_crq_process(9)
• ibmvmc_handle_crq_init(9)
• ibmvmc_handle_crq(9)
• ibmvmc_init_crq_queue(9)

like… 41 cross-refs for one tiny ioctl?? the way that ibmvmc has, an entire ecosystem 😭 obsessed honestly 🌸

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✨ and that's the page ✨

this lil beauty comes to you straight out of ./drivers/misc, dated October 2026, and it's the ibmvmc_ioctl_sethmcid(9) page, mwah 💋 slay, go set that HMC ID bestie 🫶💖