STRUCT SEV_DATA_SNP_SHUTDOWN_EX(9)

💅 struct sev_data_snp_shutdown_ex(9) — the Kernel API Manual, but make it make sense 🎀

okay so bestie, welcome to the Kernel API Manual ✨ and today's main character is struct sev_data_snp_shutdown_ex. yes the name is a mouthful, no we are not abbreviating it, she earned those underscores 👑

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🌸 NAME 🌸

struct sev_data_snp_shutdown_ex — literally the SNP_SHUTDOWN_EX structure. that's her. that's the whole vibe 🦋

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✨ SYNOPSIS ✨

here's the shape of her, exactly as she is, no notes:

struct sev_data_snp_shutdown_ex {
    u32 len;
    u32 iommu_snp_shutdown:1;
    u32 x86_snp_shutdown:1;
    u32 rsvd1:30;
 };

like, look at those bitfields. the way she packs three whole fields into one u32?? obsessed 😭💖

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🎀 Members 🎀

let's meet the girlies one by one:

• len — the length of the command buffer that gets read by the PSP. yes, the PSP. she's reading. keep it accurate pls 📏
• iommu_snp_shutdown — when this bit is set, you're disabling enforcement of SNP in the IOMMU. that's the whole job 🛑
• x86_snp_shutdown — and this bit right here disables SNP on all cores. all of them. every last one 💀
• rsvd1 — reserved. she's not for you, bestie, don't touch, don't ask 🙈

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🔥 SEE ALSO 🔥

the whole extended friend group, in the kernel file ./include/linux/psp-sev.h — no cap, this is the entire group chat:

• struct sev_data_init(9)
• struct sev_data_init_ex(9)
• struct sev_data_pek_csr(9)
• struct sev_data_download_firmware(9)
• struct sev_data_get_id(9)
• struct sev_data_pdh_cert_export(9)
• struct sev_data_decommission(9)
• struct sev_data_activate(9)
• struct sev_data_deactivate(9)
• struct sev_data_guest_status(9)
• struct sev_data_launch_start(9)
• struct sev_data_launch_update_data(9)
• struct sev_data_launch_update_vmsa(9)
• struct sev_data_launch_measure(9)
• struct sev_data_launch_secret(9)
• struct sev_data_launch_finish(9)
• struct sev_data_send_start(9)
• struct sev_data_send_finish(9)
• struct sev_data_send_cancel(9)
• struct sev_data_receive_start(9)
• struct sev_data_receive_update_data(9)
• struct sev_data_receive_update_vmsa(9)
• struct sev_data_receive_finish(9)
• struct sev_data_dbg(9)
• struct sev_data_attestation_report(9)
• struct sev_data_snp_download_firmware(9)
• struct sev_data_snp_activate(9)
• struct sev_data_snp_addr(9)
• struct sev_data_snp_launch_start(9)
• struct sev_data_snp_launch_update(9)
• struct sev_data_snp_launch_finish(9)
• struct sev_data_snp_guest_status(9)
• struct sev_data_snp_page_reclaim(9)
• struct sev_data_snp_page_unsmash(9)
• struct sev_data_snp_dbg(9)
• struct sev_data_snp_guest_request(9)
• struct sev_data_snp_init_ex(9)
• struct sev_data_range(9)
• struct sev_data_range_list(9)
• struct sev_platform_init_args(9)
• struct sev_data_snp_commit(9)
• struct sev_data_snp_feature_info(9)
• struct sev_data_snp_verify_mitigation(9)
• struct sev_data_snp_verify_mitigation_dst(9)
• struct sev_snp_tcb_version_genoa_milan(9)
• struct sev_snp_tcb_version_turin(9)
• sev_module_init(9)
• sev_platform_init(9)
• sev_platform_status(9)
• sev_issue_cmd_external_user(9)
• sev_guest_deactivate(9)
• sev_guest_activate(9)
• sev_guest_df_flush(9)
• sev_guest_decommission(9)
• sev_do_cmd(9)

like okay, that's a lot of structs, but every single one of them is invited to the party 🫶💜

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ngl bestie, the reserved field is reserved. don't be the girl who writes to rsvd1. iykyk 🙈

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that's the whole page!! sourced straight from ./include/linux, dated October 2026, and she ate fr fr — mwah, go read a struct, ily 🍓💖✨