kvm_gpc_activate(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 kvm_gpc_activate(9) 🎀

okay bestie, so this is a page from the Kernel API Manual — yes, that Kernel API Manual — and it's about kvm_gpc_activate, which is basically the glow-up routine for a cached kernel mapping + HPA for a given guest physical address. literally its whole personality. ✨

🌸 NAME 🌸

kvm_gpc_activate — prepare a cached kernel mapping and HPA for a given guest physical address. that's it, that's the vibe. 💅

🦋 SYNOPSIS 🦋

int kvm_gpc_activate (struct gfn_to_pfn_cache *gpc , gpa_t gpa ,
unsigned long len );

look at that signature. iconic. no cap. 👑

💖 ARGUMENTS 💖

  • gpc — a struct gfn_to_pfn_cache object, bestie. that's the thing we're priming. 🫶
  • gpa — the guest physical address to map. the where, if you will.
  • len — this one's just a sanity check 🧠: the range being access must fit a single page. single page only. one (1) page. don't push it.

⭐ RETURN ⭐

  • 0 — success, we ate, everything slayed 💅✨
  • -EINVAL — returned for a mapping which would cross a page boundary 🚫 a whole "no ❤️" situation.
  • -EFAULT — returned for an untranslatable guest physical address 😭 that address said "not today".

🦄 DESCRIPTION 🦄

so what does this actually do, you ask? it primes a gfn_to_pfn_cache and links it into the gpc->kvm's list for invalidations to be processed. that's the whole little ritual. 🔥

⚠️ but listen — callers are required to use kvm_gpc_check to ensure that the cache is valid before accessing the target page. like, mandatory. no skipping steps. do the vibe check first or it's giving undefined chaos, iykyk. 😤

🌈 SEE ALSO 🌈

kernel file ./include/linux/kvm_host.h, plus the whole friend group:

the whole squad fr fr 💜

okay that's the whole page, go read kvm_gpc_check next, mwah 🍓 this cutie lives in ./include/linux, it's stamped October 2026, and yes it's still kvm_gpc_activate(9) — bye bestie!! 🧚💖

📦 where this page comes from