STRUCT SEV_TIO_STATUS(9)

💖 struct sev_tio_status (9) 💖

okay bestie, welcome to the Kernel API Manual, but make it cute 🎀 this one's all about the TIO_STATUS command and the info_paddr buffer it lives in. no cap, it's a glow-up of a struct and we're gonna walk through every single field together 🫶

---

✨ NAME ✨

struct sev_tio_status — literally the TIO_STATUS command's info_paddr buffer 💅

---

🌸 SYNOPSIS 🌸

here's the whole vibe, character for character, don't touch:

struct sev_tio_status {
    u32 length;
    u32 tio_en        :1, tio_init_done :1, reserved      :30;
    u32 spdm_req_size_min;
    u32 spdm_req_size_max;
    u32 spdm_scratch_size_min;
    u32 spdm_scratch_size_max;
    u32 spdm_out_size_min;
    u32 spdm_out_size_max;
    u32 spdm_rsp_size_min;
    u32 spdm_rsp_size_max;
    u32 devctx_size;
    u32 tdictx_size;
    u32 tio_crypto_alg;
    u8 reserved2[12];
 };

like… she's got range 💀 bitfields, min/max pairs, a little reserved2[12] moment at the end. iconic.

---

🦋 Members 🦋

time for the main characters, one by one 👑

• length — the length of this structure, in bytes. she's measuring herself, honestly relatable 🪞
• tio_en — indicates that SNP_INIT_EX initialized the RMP for SEV-TIO ✨
• tio_init_done — indicates TIO_INIT has been invoked. so like, did the thing happen? this field knows 👀
• spdm_req_size_min — minimum SPDM request buffer size, in bytes 🍓
• spdm_req_size_max — maximum SPDM request buffer size, in bytes 🍓
• spdm_scratch_size_min — minimum SPDM scratch buffer size, in bytes 🧚
• spdm_scratch_size_max — maximum SPDM scratch buffer size, in bytes 🧚
• spdm_out_size_min — minimum SPDM output buffer size, in bytes 💜
• spdm_out_size_max — maximum for the SPDM output buffer size, in bytes 💜 (yes bestie, the original says "maximum for the SPDM output buffer size" and we respect the wording, fr fr)
• spdm_rsp_size_min — minimum SPDM response buffer size, in bytes 🌈
• spdm_rsp_size_max — maximum SPDM response buffer size, in bytes 🌈
• devctx_size — size of a device context buffer, in bytes 🎀
• tdictx_size — size of a TDI context buffer, in bytes 🎀
• tio_crypto_alg — the TIO crypto algorithms supported 🔥

lowkey note: reserved and reserved2[12] are in the struct too — they're not described in Members, they're just there holding space. respect their privacy 🙈

---

👑 SEE ALSO 👑

• Kernel file ./drivers/crypto/ccp/sev-dev-tio.h — go read the source, iykyk 📖

---

okay that's the whole page, you ate that 💅 this little love letter comes to you from ./drivers/crypto/ccp, dated October 2026 — version vibes and date both present and accounted for, periodt 🌟💖