plpks_early_init_devtree(9)

💖 plpks_early_init_devtree(9) — Kernel API Manual ✨

okay so bestie, buckle up, because we're diving into the Kernel API Manual section 9 and this one's a little rescue mission 🫶

---

🌸 NAME 🌸

plpks_early_init_devtree — literally goes and grabs the PLPKS password out of the DT during early init, then wipes it clean 🧚

---

✨ SYNOPSIS ✨

void plpks_early_init_devtree (void );

---

🎀 ARGUMENTS 🎀

• void — no arguments, babes. she takes nothing, she gives everything 💅

---

🦋 DESCRIPTION 🦋

okay so here's the situation. once a password is registered with the hypervisor, it cannot be cleared without rebooting the LPAR — that's just the rules, no cap 😭. so to keep using the PLPKS across kexec boots, we have to recover the previous password from the FDT. iconic behavior honestly 👑

but it's not that simple, and there are a few challenges here, bestie:

• we do not want the password visible to users 🙈, so we need to clear it from the FDT.
• this has to happen in early boot ⏰ — like, first-thing energy.
• clearing it out of the FDT makes the FDT's checksum invalid 💀, so we have to manually cause the checksum to be recalculated.

it's giving main-character bugfix energy fr fr 🔥

---

🌈 SEE ALSO 🌈

Kernel file ./arch/powerpc/platforms/pseries/plpks.c 🍓

and the whole plpks friend group, assembled 👑:

• plpks_get_version(9)
• plpks_get_objoverhead(9)
• plpks_get_maxpwsize(9)
• plpks_get_maxobjectsize(9)
• plpks_get_maxobjectlabelsize(9)
• plpks_get_totalsize(9)
• plpks_get_usedspace(9)
• plpks_get_supportedpolicies(9)
• plpks_get_maxlargeobjectsize(9)
• plpks_get_signedupdatealgorithms(9)
• plpks_get_wrappingfeatures(9)
• plpks_get_passwordlen(9)
• plpks_is_available(9)
• plpks_signed_update_var(9)
• plpks_write_var(9)
• plpks_remove_var(9)
• plpks_wrapping_is_supported(9)
• plpks_gen_wrapping_key(9)
• plpks_wrap_object(9)
• plpks_unwrap_object(9)
• plpks_read_os_var(9)
• plpks_read_fw_var(9)
• plpks_read_bootloader_var(9)
• plpks_populate_fdt(9)

---

lowkey obsessed with how many friends she has 💜

---

and that's the tea, bestie ☕ this page lives in ./arch/powerpc/platforms/pseries, dated October 2026, and it's your girl plpks_early_init_devtree(9) signing off 😘💅✨