kvm_pmu_set_...r_event_type(9)

💖 NAME 💖

kvm_pmu_set_counter_event_type — bestie, this is the one that sets a selected counter to monitor some event 👑

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✨ SYNOPSIS ✨

void kvm_pmu_set_counter_event_type (struct kvm_vcpu *vcpu , u64 data ,
       u64 select_idx );

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🎀 ARGUMENTS 🎀

• vcpu — the vcpu pointer, literally the whole main character of this function 🫶
• data — the data the guest writes to PMXEVTYPER_EL0
• select_idx — the number of the selected counter (yes, which one, and yes, it matters 💅)

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🌸 DESCRIPTION 🌸

okay so picture this: when the OS accesses PMXEVTYPER_EL0, that means it wants to set a PMC to count an event with a given hardware event number. icon behavior, honestly.

Here we call the perf_event API to emulate this action, and we create a kernel perf event for it. that's it, that's the whole vibe ✨🦋

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🔥 SEE ALSO 🔥

kernel file ./arch/arm64/kvm/pmu-emul.c (go read it, iykyk 🧚) plus the whole bestie squad:

• kvm_pmc_is_64bit(9)
• kvm_pmu_get_counter_value(9)
• kvm_pmu_set_counter_value(9)
• kvm_pmu_set_counter_value_user(9)
• kvm_pmu_release_perf_event(9)
• kvm_pmu_stop_counter(9)
• kvm_pmu_vcpu_init(9)
• kvm_pmu_vcpu_destroy(9)
• kvm_pmu_flush_hwstate(9)
• kvm_pmu_sync_hwstate(9)
• kvm_pmu_software_increment(9)
• kvm_pmu_handle_pmcr(9)
• kvm_pmu_create_perf_event(9)
• kvm_arm_pmu_get_max_counters(9)
• kvm_arm_set_default_pmu(9)
• kvm_vcpu_read_pmcr(9)

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ngl the page title got truncated to kvm_pmu_set_...r_event_type(9) but you and i both know the real one 💀 the manual is the Kernel API Manual, in case you were wondering who's behind this masterclass 📖

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that's the whole page, bestie — written from ./arch/arm64/kvm, dated October 2026, no cap 🌈⭐ slay responsibly 💜