STRUCT SVSM_VTPM_RESPONSE(9)

💖 struct svsm_vtpm_response(9) 💖

okay so bestie, welcome to the Kernel API Manual page for struct svsm_vtpm_response — literally the "Generic response" struct, and yes it's as tiny and iconic as it sounds 🎀

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✨ SYNOPSIS ✨

struct svsm_vtpm_response {
    u32 size;
};

that's it. that's the whole vibe. one member. main character energy, zero filler 💅

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🌸 MEMBERS 🌸

• size — the response size, and it's zero if nothing follows 🫶 like, if there's no payload after it, it's just 0. periodt.

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🦋 DESCRIPTION 🦋

This struct is defined by the AMD SVSM spec [1], in the section called "8.2 SVSM_VTPM_CMD Call" — specifically Table 15: vTPM Common Request/Response Structure. slay, citation game strong 💜

Here's the deets from that table, laid out so it's actually readable:

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

so yeah, it's four bytes at offset 0x000, and it does double duty — in one direction it's the platform command, in the other it's the platform command response size. multitasking icon 👑

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⭐ NOTE ⭐

ngl this part is important: most TCG Simulator commands simply return zero here with no indication of success or failure 😭 so don't go reading the size field expecting a vibe check on whether things worked, because it will not tell you. it's giving "no thoughts, head empty" fr fr 💀

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🧚 SEE ALSO 🧚

• Kernel file ./include/linux/tpm_svsm.h
• struct svsm_vtpm_request(9)
• struct svsv_vtpm_cmd_request(9) — wait, no, bestie, that's struct svsm_vtpm_cmd_request(9) 🫶
• struct svsm_vtpm_cmd_response(9)
• svsm_vtpm_cmd_request_fill(9)
• svsm_vtpm_cmd_response_parse(9)

go read those next, iykyk 💖

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and that's the page!! brought to you by ./include/linux, dated October 2026, and yeah the title up top is literally struct svsm_vtpm_response(9) again because tradition ✨ mwah, love u, bye 🎀