kvm_arm_setup_mdcr_el2(9)

okay bestie, welcome to kvm_arm_setup_mdcr_el2(9) from the Kernel API Manual — this is the page where mdcr_el2 gets its whole setup moment, and honestly? iconic 💖

✨ NAME ✨

kvm_arm_setup_mdcr_el2 — configure vcpu mdcr_el2 value 💅

That's exactly the NAME business: configure vcpu mdcr_el2 value. No cap.

🦋 SYNOPSIS 🦋

void kvm_arm_setup_mdcr_el2 (struct kvm_vcpu *vcpu );

That's the whole signature, bestie: void, the function name, and a struct kvm_vcpu *vcpu pointer. Slay.

🎀 ARGUMENTS 🎀

• vcpu — the vcpu pointer. That's it, that's the argument, and she's literally the main character 🌸

💖 DESCRIPTION 💖

okay so this function is the vibe check for mdcr_el2. It ensures we will trap access to:

• Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR) 👑
• Debug ROM Address (MDCR_EL2_TDRA) 🦋
• OS related registers (MDCR_EL2_TDOSA) 🎀
• Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB) ⭐
• Self-hosted Trace Filter controls (MDCR_EL2_TTRF) 🔥
• Self-hosted Trace (MDCR_EL2_TTRF/MDCR_EL2_E2TB) 💜

The way that list is giving "trap access to all of these" is the whole point, fr fr. And yes, MDCR_EL2_TTRF shows up in two of the bullets — that's what the page says, so we keep it exactly like that, periodt 💅

🌈 SEE ALSO 🌈

Kernel file ./arch/arm64/kvm/debug.c — go peek, iykyk 👀

okay that's the tea and the footer energy: source/version ./arch/arm64/kvm, date October 2026, manual kvm_arm_setup_mdcr_el2(9) — bye bestie, mwah 🫶✨