vfio_ap_on_cfg_changed(9)

✨ vfio_ap_on_cfg_changed(9) ✨

okay so bestie, we're in the Kernel API Manual today and this one is a whole notification handler moment — say hi to vfio_ap_on_cfg_changed 🎀

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🌸 NAME 🌸

vfio_ap_on_cfg_changed — handles notification of changes to the host AP configuration. literally that's the whole job, and it ate 💅

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🦋 SYNOPSIS 🦋

void vfio_ap_on_cfg_changed (struct ap_config_info *cur_cfg_info ,
struct ap_config_info *prev_cfg_info );

no cap, that's the signature, copy it exactly bestie 🫶

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🎀 ARGUMENTS 🎀

two args, both required, both iconique:

• cur_cfg_info — the current host AP configuration. yes, the now one ✨
• prev_cfg_info — the previous host AP configuration. the before one, for comparison vibes 🙈

fr fr, both of these are struct ap_config_info * pointers — one for what the host AP config looks like right now, one for what it looked like before. that's the entire drip of this function.

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💜 SEE ALSO 💜

bestie the reading list is LONG and honestly it's giving "whole friend group tagged in the group chat" energy 😭 start with the kernel file itself:

• Kernel file ./drivers/s390/crypto/vfio_ap_ops.c

okay and then the full cast, in order, no skips:

• get_update_locks_for_kvm(9)
• release_update_locks_for_kvm(9)
• get_update_locks_for_mdev(9)
• release_update_locks_for_mdev(9)
• get_update_locks_by_apqn(9)
• get_update_locks_for_queue(9)
• vfio_ap_mdev_get_queue(9)
• vfio_ap_wait_for_irqclear(9)
• vfio_ap_free_aqic_resources(9)
• vfio_ap_irq_disable(9)
• vfio_ap_validate_nib(9)
• ensure_nib_shared(9)
• vfio_ap_irq_enable(9)
• vfio_ap_le_guid_to_be_uuid(9)
• handle_pqap(9)
• vfio_ap_mdev_verify_no_sharing(9)
• vfio_ap_mdev_validate_masks(9)
• assign_adapter_store(9)
• vfio_ap_mdev_unlink_adapter(9)
• unassign_adapter_store(9)
• assign_domain_store(9)
• unassign_domain_store(9)
• assign_control_domain_store(9)
• unassign_control_domain_store(9)
• vfio_ap_mdev_set_kvm(9)
• vfio_ap_mdev_unset_kvm(9)
• vfio_ap_mdev_resource_in_use(9)
• vfio_ap_mdev_hot_unplug_cfg(9)
• vfio_ap_mdev_cfg_remove(9)
• vfio_ap_mdev_on_cfg_remove(9)
• vfio_ap_filter_apid_by_qtype(9)
• vfio_ap_mdev_cfg_add(9)
• vfio_ap_mdev_on_cfg_add(9)

like. thirty-three of them. go off kernel docs 👑

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and that's the page, bestie 🧚 this little beauty lives at ./drivers/s390/crypto, dated October 2026, and it's filed under vfio_ap_on_cfg_changed(9). mwah 💋