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+# GSP in a RISC-V VM — green-eye (experimental)
+
+> **# TOOL IN DEVELOPMENT - NOT READY YET!**
+> This is experimental developer tooling. It is not part of the shipped
+> emulation, never runs in a guest, and its interfaces, file formats and
+> documented workflows may change without notice. Do not depend on it in
+> production paths or cite it as a supported feature. When it reaches a
+> minimum stable level, the flags will be removed from this document and from
+> the developer-tools list.
+
+## 1. What it is
+
+**green-eye** runs GSP/uproc firmware in a `qemu-system-riscv64` VM and makes
+its runtime behaviour inspectable with Frida-like primitives:
+
+* breakpoints and enter/leave hooks (RV64 ABI aware),
+* watchpoints on firmware variables,
+* memory read/write/hexdump/search, structure decoding, snapshot diffing,
+* recorded sessions: a replayable event stream plus memory dumps
+  (`events.jsonl`, snapshots, `summary.md`),
+* declarative probe specs, a plugin API and a Ghidra symbol/hit bridge.
+
+Its stated purpose is **simulating and inspecting the GSP firmware's runtime
+memory for `gsp-rm-vfio` accuracy measurements**: capture how the firmware
+behaves, compare that with the emulation and with the physical backend, and
+survive GSP version/device/architecture churn with repeatable evidence.
+
+The tooling lives in
+[`../../debug/risc-v-gsp-rm-vm/`](../../debug/risc-v-gsp-rm-vm/README.md);
+its full documentation set (design, usage, scripting, plugins, Ghidra bridge,
+accuracy, portability playbooks, roadmap) is under
+`debug/risc-v-gsp-rm-vm/docs/`.
+
+## 2. What it is not
+
+* **Not a GSP boot environment.** QEMU `virt` has no falcon windows, WPR2,
+  CSB/TRANSCOM, PMU, timers or FB DMA. `greeneye probe` shows exactly where
+  the real image first diverges (for the TU104 570.144 image: a load-access
+  fault at firmware vaddr `0x4009014` reading `0x2000000000000A00`); it does
+  not boot it. A device model is a roadmap item, not a claim.
+* **Not a timing model.** Do not infer latency or concurrency behaviour from
+  it; its in-scope conclusions are execution flow and memory side effects.
+* **Not a replacement for Ghidra or the guest diagnostics.** Ghidra answers
+  *what is the code*; green-eye answers *what did it do*. The guest driver
+  remains the oracle for guest-side behaviour.
+
+## 3. Where it fits
+
+| Layer | Tool | Question answered |
+|---|---|---|
+| Static | Ghidra corpus (`userspace/cuda`, `tools/ghidra`) | what is the code? |
+| Guest driver | `tools/guest-diag/`, ptrace tracer | what did the driver request? |
+| Physical backend | supervised physical cycles, module logs | what did real silicon/the real GSP-RM do? |
+| **Firmware runtime (this)** | **green-eye** | **what does the firmware server do, repeatably and safely?** |
+
+The intended measurement loop is: capture the real backend's RPC behaviour,
+run the same stimulus in green-eye, and compare the recorded sessions
+(`greeneye compare`) with the accuracy metrics defined in the tool's
+`docs/06-ACCURACY.md`. Portability runs (new GSP, new device, GB10-class
+architecture) are described in `docs/07-PORTABILITY-PLAYBOOKS.md`.
+
+## 4. Quick start
+
+From the repository root:
+
+```bash
+cd debug/risc-v-gsp-rm-vm
+./greeneye.sh info                 # environment check (QEMU, toolchain)
+make demo                          # build the bundled RV64 uproc demo
+./greeneye.sh demo                 # canned instrumentation pass; records a session
+./greeneye.sh analyze dumps/<session>
+./greeneye.sh probe                # real GSP image: report the first divergence
+```
+
+Requirements: `qemu-system-riscv64` (Ubuntu `qemu-system-misc`), Python 3.10+
+(stdlib only), `clang` + `lld` for the demo firmware. The tool touches no GPU,
+no mdev, no kernel module and no host driver.
+
+## 5. Status and limits (v0.1)
+
+Working and live-verified: QEMU boot and gdbstub transport without GDB,
+hooks/breakpoints/watchpoints, memory tools, structure decoding, session
+recording and analysis, declarative probes, plugins, the Ghidra bridge, and
+the real-firmware first-fault probe. The TCG full-memory trace plugin builds
+and records. Not implemented: device model (R1), custom simulator (R2), MCP
+plugin (R3) — all roadmap.
+
+## 6. When the development flag can be removed
+
+The marker comes off this document and the developer-tools list when:
+
+1. the v0.1 acceptance list in `debug/risc-v-gsp-rm-vm/docs/00-OVERVIEW.md`
+   passes on a clean checkout;
+2. the usage recipes in `docs/02-USAGE.md` are verified end-to-end;
+3. a second person or agent can run the quickstart unaided;
+4. the session format and CLI are declared stable.
+
+Until then, treat everything here as in development.