STRUCT SEV_DATA_SNP_LAUNCH_UPDATE(9)

💅 struct sev_data_snp_launch_update(9)

okay bestie, welcome to the Kernel API Manual ✨ this one's from ./include/linux and it's dated October 2026, so yeah, we're literally reading the future 🫶

---

🌸 NAME 🌸

struct sev_data_snp_launch_update — the params for the SNP_LAUNCH_UPDATE command, no cap 💫

---

✨ SYNOPSIS ✨

here's the whole struct, exactly as it lives, don't touch a single field:

struct sev_data_snp_launch_update {
    u64 gctx_paddr;
    u32 page_size:1;
    u32 page_type:3;
    u32 imi_page:1;
    u32 rsvd:27;
    u32 rsvd2;
    u64 address;
    u32 rsvd3:8;
    u32 vmpl1_perms:8;
    u32 vmpl2_perms:8;
    u32 vmpl3_perms:8;
    u32 rsvd4;
 };

---

🎀 Members 🎀

okay so let's go field by field, i got you 👑

• gctx_paddr — the system physical address of the guest context page. like, where the gctx actually lives in memory 🏠
• page_size — page size, and it's picky: 0 means a 4K page, 1 means a 2MB page. binary choice, main character energy 💅
• page_type — the encoded page type. encoded, bestie, don't just guess at it 🔐
• imi_page — tells you this page is part of the guest's IMI (that's the Incoming Migration Image) 🦋
• rsvd — reserved. leave it alone 🙈
• rsvd2 — reserved too. also leave it alone 😭
• address — the system physical address of the destination page to encrypt 🔥 this is the one doing the actual work
• rsvd3 — reserved, again 💀
• vmpl1_perms — the VMPL permission mask for VMPL1 👑
• vmpl2_perms — the VMPL permission mask for VMPL2 👑
• vmpl3_perms — the VMPL permission mask for VMPL3 👑
• rsvd4 — reserved. fourth time's the charm 🌸

real talk: there are four reserved fields in here (rsvd, rsvd2, rsvd3, rsvd4) and they're reserved for a reason — don't get creative with them, that's not the vibe 🫶

---

🌈 SEE ALSO 🌈

this list is long and it ate, every single one is here, periodt:

• Kernel file ./include/linux/psp-sev.h
• 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_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_data_snp_shutdown_ex(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)

---

and that's the whole page, bestie 🧚💜 mwah 💋

source: ./include/linux · dated October 2026 · tilde-tilde-tilde struct sev_...aunch_update(9) tilde-tilde-tilde ✨ slay, go encrypt your pages 🍓