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This is actually running on top of a WebAssembly-based Java Virtual Machine (CheerpJ).

You are probably thinking about our independent x86 virtualization product CheerpX (https://cheerpx.io)

No, I'm thinking about porting the Linux kernel to WASM itself and not using a VM written in WASM but WASM directly:

In other words, using WASM as if it were the CPU architecture in the VM.