STRUCT SVSM_VTPM_REQUEST(9)

✨ struct svsm_vtpm_request(9) ✨

okok so we're in the Kernel API Manual bestie, and today's main character is struct svsm_vtpm_request — literally just the generic request for a single word command 🎀

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🌸 NAME 🌸

struct svsm_vtpm_request — the generic request for single word command, no cap 💅

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🦋 SYNOPSIS 🦋

struct svsm_vtpm_request {
    u32 cmd;
 };

like, that's the whole thing. she's small. she's iconic. she contains multitudes (one multitude, actually) ✨

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🎀 Members 🎀

• cmd — the command to send 📨 that's it, that's the job.

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💖 Description 💖

so this whole struct is defined by the AMD SVSM spec [1], specifically in the section called "8.2 SVSM_VTPM_CMD Call" — Table 15: vTPM Common Request/Response Structure 🧚

here's the deets, laid out the way the spec lays 'em out:

• Byte Offset 0x000
• Size (Bytes) 4
• In/Out In → Platform command
• In/Out Out → Platform command response size

so like, same offset, same size, two directions — it's giving "one struct, two moods" 😭🫶

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/tpm_svsm.h
• struct svsm_vtpm_response(9)
• struct svsm_vtpm_cmd_request(9)
• struct svsm_vtpm_cmd_response(9)
• svsm_vtpm_cmd_request_fill(9)
• svsm_vtpm_cmd_response_parse(9)

like go read those too, they're the rest of the friend group 👑✨

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ngl this one's short but she ate. go forth and send your single word command, bestie 💜

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and that's the whole page!! brought to you by the fine people over at ./include/linux, dated October 2026 — mwah, see u in the next one 🍓💫