kvm_mips_ktime_to_count(9)

📦 version 7.3.1, in nixpkgs unstable

💅 kvm_mips_ktime_to_count(9) — from the Kernel API Manual, bestie ✨

okay so picture this: it's a section-9 manual page, it's called kvm_mips_ktime_to_count, and it is genuinely so much more chill than it sounds. like yes it's kernel internals but we're gonna get through it together, i promise 🫶

✨ NAME ✨

kvm_mips_ktime_to_count — the little function that scales a ktime_t down into a 32-bit count. that's it. that's the whole job. slay 💅

🌸 SYNOPSIS 🌸

u32 kvm_mips_ktime_to_count (struct kvm_vcpu *vcpu , ktime_t now );

so it hands you back a u32, and you feed it a struct kvm_vcpu * plus a ktime_t. two in, one out. iconique ✨

🎀 ARGUMENTS 🎀

okay so this is lowkey the funniest part of the whole page, ngl:

  • vcpu — -- undescribed -- 💀 the docs literally did not describe it. no cap. we are all just out here living.
  • now — -- undescribed -- 🙈 same energy. also undescribed. the manual said "not my problem" and honestly? respect.

so yeah bestie, the source of truth on these two is the code itself. iykyk 🦋

💖 DESCRIPTION 💖

here's the vibe: this function caches the dynamic nanosecond bias in vcpu->arch.count_dyn_bias.

that's the whole thing. it stashes that bias right there in vcpu->arch.count_dyn_bias so you don't have to keep recomputing it. main character optimization energy honestly ⭐

⚠️ but listen — it assumes !kvm_mips_count_disabled(vcpu) (which is just a fancy way of saying the guest CP0_Count timer is running). so do a vibe check first, bestie, because if the count is disabled this assumption is not it 😭 keep that timer running and you're golden.

🦋 SEE ALSO 🦋

so you want the whole friend group? periodt, here's everyone, and they all live in the kernel file ./arch/mips/kvm/emulate.c:

like, nineteen whole besties. go read them all, i'll wait 🍓

and that's the page!! 💜 it lives at ./arch/mips/kvm, it's dated October 2026, and the whole thing is filed under kvm_mips_ktime_to_count(9) — go off, king 👑✨

📦 where this page comes from