ibmvmc_send_capabilities(9)

💖 ibmvmc_send_capabilities — Send VMC Capabilities 💖

okay so this is a page from the Kernel API Manual, section 9 (that's the kernel API section bestie, we're in the big leagues now ✨). Sit down, grab a strawberry drink 🍓, and let's get into it.

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✨ NAME ✨

ibmvmc_send_capabilities — Send VMC Capabilities 🫶

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🎀 SYNOPSIS 🎀

int ibmvmc_send_capabilities (struct crq_server_adapter *adapter );

literally that's the whole signature. she's compact, she's iconic, she takes exactly one (1) argument. 💅

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🦋 ARGUMENTS 🦋

• adapter — the crq_server_adapter struct, no cap. that's the one thing you hand her.

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🌸 DESCRIPTION 🌸

okay so listen 👑 — the capabilities message is an administrative message. it gets sent after the CRQ initialization sequence of messages, and its whole job is to exchange VMC capabilities between the management partition and the hypervisor. like a little handshake, but fancy.

the rules are strict, ngl:

• the management partition must send this message, periodt. no skipping.
• the hypervisor must respond with the VMC capabilities Response message before the HMC interface message can even begin. the vibe check has to be mutual 💫
• any HMC interface messages received before the exchange of capabilities has complete are dropped. yeah. literally dropped. 💀 don't send early, it will not work, it's giving "left on read."

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🔥 RETURN 🔥

• 0 — Success ✨ (that's it, that's the whole list. slay.)

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🧚 SEE ALSO 🧚

the kernel file lives at ./drivers/misc/ibmvmc.c — and here's the whole friend group, go say hi 🫶:

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_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_sethmcid(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)

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and that's the page!! mwah 💋 this one ships out of ./drivers/misc and it's dated October 2026 — mark your calendars bestie, she's timeless 💜🌈⭐