kvm_mips_migrate_count(9)

✨ kvm_mips_migrate_count(9) — the Kernel API Manual, MIPS KVM era ✨

Okay bestie, gather round, because we're reading a kernel API manual page together and honestly? It's kind of a bop. This one lives in the kvm_mips_migrate_count(9) corner of the Kernel API Manual universe, and it's all about making a timer follow its VCPU to a new CPU. Very main character relocation energy. 💅

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🦋 NAME 🦋

kvm_mips_migrate_count — Migrate timer.

Like, that's it. That's the whole job description. The timer migrates. Iconic, minimal, no notes. ✨

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🎀 SYNOPSIS 🎀

void kvm_mips_migrate_count (struct kvm_vcpu *vcpu );

It returns void, so don't be out here expecting a little gift back. 🎁

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🌸 ARGUMENTS 🌸

• vcpu — Virtual CPU. Yeah, that's the whole explanation. It's the virtual CPU. The one and only. The one we're dragging over to a different CPU. 🫶

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💖 DESCRIPTION 💖

So here's the tea, bestie: this function migrates the CP0_Count hrtimer to the current CPU by cancelling it and restarting it — but only if it was running prior to being cancelled. No cap, that's the whole move. Cancel, restart, if it was running. That's it. 🕐✨

And it must be called when the VCPU is migrated to a different CPU. Not "should", not "maybe if you feel like it" — must. Because the whole point is to ensure that timer expiry during guest execution actually interrupts the guest and causes the interrupt to be delivered in a timely manner. Like, if you skip this, the interrupt is just... late to the party. 😭🙈

⚠️ Heads up: this isn't optional decoration. If the VCPU moves CPUs and you don't call this, the timer expiry / interrupt delivery thing gets messy. Call it. Periodt. 💅

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🔥 SEE ALSO 🔥

Kernel file ./arch/mips/kvm/mmu.c, plus the whole friend group:

• kvm_pgd_init(9)
• kvm_pgd_alloc(9)
• kvm_mips_walk_pgd(9)
• kvm_mips_flush_gpa_pt(9)
• kvm_mips_mkclean_gpa_pt(9)
• kvm_arch_mmu_enable_log_dirty_pt_masked(9)
• _kvm_mips_map_page_fast(9)
• kvm_mips_map_page(9)

Squad goals, honestly. 👑

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And that's the page, bestie — go touch grass (or, like, go read ./arch/mips/kvm) 🧚

Source/version vibes: this one's from the ./arch/mips/kvm directory, dated October 2026, and it's kvm_mips_migrate_count(9) all the way down. Mwah. 💜💋