STRUCT SMM_VARIABLE_ACCESS(9)

🌸 struct smm_variable_access(9) 🌸

okay so you're in the Kernel API Manual bestie, and this page is all about a lil struct that's basically the group chat between the kernel and StMM 💅

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✨ NAME ✨

struct smm_variable_access — the struct you use to communicate with StMM by SetVariable and GetVariable. literally its whole job 🫶

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🎀 SYNOPSIS 🎀

struct smm_variable_access {
    efi_guid_t guid;
    size_t data_size;
    size_t name_size;
    u32 attr;
    u16 name[];
};

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💖 Members 💖

no cap, every field is doing its little part. here's the lineup 👑

• guid — the vendor GUID. like, whose variable is this even 🧐
• data_size — the size of the EFI variable data 📦
• name_size — the size of the EFI name 🏷️
• attr — the attributes ✨
• name — the variable name itself, main character energy 👑

the way name is a flexible array member (u16 name[]) — iconic, but it lives at the end for a reason, so pls respect the layout 🙈

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🦋 SEE ALSO 🦋

go read these next, iykyk 📚

• Kernel file ./drivers/firmware/efi/stmm/mm_communication.h struct efi_mm_communicate_header(9)
• struct smm_variable_communicate_header(9)
• struct smm_variable_payload_size(9)
• struct smm_variable_getnext(9)
• struct smm_variable_query_info(9)
• struct var_check_property(9)
• struct smm_variable_var_check_property(9)

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and that's the whole vibe check 🌈 this queen lives in ./drivers/firmware/efi/stmm, dated October 2026, and she's still struct smm_variable_access(9) — periodt 💅💜