STRUCT TSM_MEASUREMENT_REGISTER(9)

💖 NAME 💖

okay so bestie, welcome to struct tsm_measurement_register(9) from the Kernel API Manual — this one's literally just a lil struct that describes an architectural measurement register (MR) 💅

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✨ SYNOPSIS ✨

struct tsm_measurement_register {
    const char *mr_name;
    void *mr_value;
    u32 mr_size;
    u32 mr_flags;
    enum hash_algo mr_hash;
 };

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🫶 MEMBERS 🫶

• mr_name — the name of the MR, bestie. that's it, that's the whole job 🎀
• mr_value — a buffer holding the current value of the MR 📦
• mr_size — how big the MR is — usually the digest size of mr_hash, iykyk
• mr_flags — a bitwise OR of one or more flags, all spelled out below ⬇️
• mr_hash — an optional hash identifier, defined over in include/uapi/linux/hash_info.h

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🌸 DESCRIPTION 🌸

so a CC guest driver wraps an array of this struct inside struct tsm_measurements to lay out all the details of the measurement facility that the underlying CC hardware supports. main character energy for a struct, honestly 👑

🚨 real talk: mr_name and mr_value must stay valid until this structure is no longer in use. no dangling pointers on my watch, fr fr 😭

mr_flags is the bitwise-OR of zero or more of the flags below:

• TSM_MR_F_READABLE — the sysfs attribute for this MR is readable 👀
• TSM_MR_F_WRITABLE — the sysfs attribute for this MR is writable. the semantics is typically to extend the MR, but ngl it could vary depending on the architecture and the MR 🖊️
• TSM_MR_F_LIVE — this MR's value may differ from the last value written, so it must be read back from the underlying CC hardware/firmware. no trusting your memory here bestie 🔄
• TSM_MR_F_RTMR — literally just the bitwise-OR of TSM_MR_F_LIVE and TSM_MR_F_WRITABLE 🌈
• TSM_MR_F_NOHASH — this MR does NOT have an associated hash algorithm. mr_hash gets ignored when this flag is set, periodt 🙈

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🎀 SEE ALSO 🎀

• Kernel file ./include/linux/tsm-mr.h
• struct tsm_measurements(9)

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and that's the whole vibe check! 🦋 this lil gem lives at ./include/linux, dated October 2026, and it answers to struct tsm_...ent_register(9) — slay, go read the kernel source, ily, bye 💜✨