STRUCT SMM_VARIABLE_QUERY_INFO(9)

💅 struct smm_variable_query_info(9) — a Kernel API Manual moment

okay bestie, welcome to the Kernel API Manual ✨ this one's a struct page and it's lowkey iconic if you're into EFI/StMM stuff 🦋 (and if you're not, you're about to be, trust)

🌸 NAME 🌸

struct smm_variable_query_info — the little struct that gets used to communicate with StMM for QueryVariableInfo. that's it, that's the whole vibe 🎀

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✨ SYNOPSIS ✨

struct smm_variable_query_info {
    u64 max_variable_storage;
    u64 remaining_variable_storage;
    u64 max_variable_size;
    u32 attr;
 };

like, look at her. four fields, fully structured, main character energy 👑

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🫶 Members 🫶

• max_variable_storage — the max available storage, fr fr 💖 this is the ceiling, the limit, the absolute most.
• remaining_variable_storage — the remaining available storage, aka how much room is still left for you 🥺
• max_variable_size — the max variable supported size. biggest variable she can handle, no cap 💅
• attr — the attributes to query storage for 🔥 so like, which attributes we're asking about storage-wise. specific queen behavior.

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👑 SEE ALSO 👑

kernel file ./drivers/firmware/efi/stmm/mm_communication.h and honestly her whole friend group:

• struct efi_mm_communicate_header(9)
• struct smm_variable_communicate_header(9)
• struct smm_variable_access(9)
• struct smm_variable_payload_size(9)
• struct smm_variable_getnext(9)
• struct var_check_property(9)
• struct smm_variable_var_check_property(9)

go read them, iykyk 📚✨

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ngl this page lives in ./drivers/firmware/efi/stmm and it's dated October 2026 🌈 so like, remember her like that.

mwah, that's the whole page bestie, go forth and query variable info responsibly 💜🧚‍♀️