What is an S-EL2 hypervisor?

It's ARM's Secure EL2 hypervisor managing Secure Partitions — isolated VMs for crypto, DRM — separate from Normal world's pKVM.

How does Rust replace Hafnium?

30K no_std lines boot Linux, handle FF-A, coexist with pKVM; slashes code 85%, adds memory safety via enums, borrow checker.

Can I run this Rust SPMC on my ARM device?

Needs ARMv9+ SoC with TF-A BL32 support; build from source, test on QEMU-emulated chips first.

☁️ Cloud & Infrastructure

Rust's 30K-Line Conquest: Ditching Hafnium for Dual Hypervisors on ARM

Two hypervisors, one SoC. That's the audacious hack: Rust ousting Hafnium in ARM's Secure world while pKVM rules the Normal one. Boot Linux, swap messages across worlds — it just works.

theAIcatchup Apr 09, 2026 4 min read

Diagram of dual hypervisors pKVM and Rust SPMC sharing ARM SoC across Normal and Secure worlds

⚡ Key Takeaways

Rust SPMC replaces 200K-line Hafnium with 30K no_std lines, booting Linux alongside pKVM on one ARM SoC. 𝕏
Coexistence demands per-CPU handshakes, NS-bit MMU hacks, cache copies — Rust enums prevent state bugs. 𝕏
Foreshadows Rust in production confidential compute, slashing audit burden for ARM OEMs. 𝕏

Published by

theAIcatchup

Ship faster. Build smarter.

#ARM S-EL2 #ARM SPMC #ARM hypervisor #FF-A protocol #Hafnium #Hafnium replacement #Rust hypervisor #Rust systems programming #Secure Partitions #pKVM #pKVM FF-A #pKVM coexistence

Worth sharing?

Get the best Developer Tools stories of the week in your inbox — no noise, no spam.

Originally reported by dev.to

⚡ Key Takeaways

The 60-Second TL;DR

theAIcatchup

Share this article

Worth sharing?

Related Stories

Fake Token Hijacks Solana's Drift Governance — $285M Gone in 12 Minutes

OpenTelemetry Cracks Open the Black Box of LLM Costs

S3 Files: Killing the Hidden Copy Layers in Your Cloud Pipelines

I Slashed Claude Code Token Waste by 65%—Here's the File Structure Secret

Stay in the loop