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registry variant; complete vgsp rename; docs/tooling refresh
- gsp_phys_booter: GR promote bisection modes 4-17 (two-phase zero-field VA,
batched entries, hVirtMemory, bare VA, KMD SKIP_CTXBUFFER_ALLOC channel,
old-interface GPU_INITIALIZE_CTX, FBMEM context buffer, UVM-faithful PA-only,
PATCH/PM auxiliary promotes, server-managed no-promote path); PATCH/PM
geometry queries and buffers; pre-boot SET_REGISTRY profile selection
- gsp_phys_gpu: gsp_phys_rmcall_gr_promote clamp 0..17 and gsp_phys_srv_ctxbuf
parameter; registry image variant with RMSetClientRMAllocatedCtxBuffer=0
- vgsp rename across kernel, scripts, tools and docs (module vgsp.ko,
/sys/kernel/debug/vgsp/, vgsp-<subsystem>: log prefixes)
- risc-v-gsp-rm-debugger user-facing rename and docs/CI refresh; guest-diag
tool updates; README/SBOM/install/Makefile sync
Live status: CE ladder and P6 guest-copy forwarding green; GR engine context
commit still open (all promote shapes accepted or cleanly refused; the channel
stays CTXNOTVALID) - see Handoff-vGPU-IO.md Addendum 21 (local).
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third-party references
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physical-backend lock
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- add docs/03-architecture/08-physical-gpu-integration.md: interfaces that
exist, mechanism options A-E, chosen path (module-owned GPU driven through
its real GSP firmware), sharing policy, decision record
- update 06-host-module-and-hybrid-model, 02-practical-challenges, system
overview, known-knowns, docs/README reading order and CUDA-side docs to
match
- correct stale engine-topology/COPY14 blocker claims across the tree
- add STATE-CURRENT.md as the dated public status snapshot
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* Name recovery: name_candidates.py proposes the hand-written API-layer
implementation for each exported wrapper by grouping version variants and
intersecting their callees; 180 high-confidence proposals recorded in
annotations/name-candidates.tsv, 29 of them body-verified and promoted to
names.tsv with evidence in subsystems.tsv.
* Engine records: identified the 0x14-byte per-engine descriptor, mapped its
fields (kind, engine type, instance, class id, CE caps) and the existence
callback, and documented how the missing async copy engine (COPY14) leaves
the secondary record zeroed and blocks context creation (docs/05 section
3.7, public-safe).
* Targeted type recovery: AnalyzeFunctions.java runs the parameter-ID
analyzer over a curated list of 80 functions; 16 improved materially and
the typed decompilations are kept under the version run tree.
* Cross-version: cudatool.py fdematch measures how names transfer between
patch versions (570.144 -> 570.211.01: exports 100%, verified internals
~70%, generated wrappers must be re-resolved by relocation, never by
address arithmetic); documented in the upgrade playbook.
* Corpus tooling: diff_corpus.py (version-to-version corpus diff) and
subsystem_digest.py (per-subsystem call trees).
* Deprecate the old per-version helpers whose address handling and analysis
timeout produced wrong results.
Generated corpora and typed outputs remain untracked under the version run
tree.
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The per-area coordination file was local scratch (gitignored); future
parallel work is announced through the project handoff instead.
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Add the analysis of the NVIDIA CUDA userspace driver used by Open-IOV VMs:
* docs/01-08: architecture (layers, object model, threads, sync, memory,
channels, launch), build and execution model, the driver/kernel/GPU
interface contract, virtualization approaches, the 570.144 decompilation
map with the corrected libcuda crash path and the current engine-topology
blocker, tooling, and a version-upgrade playbook.
* tools/: version-agnostic toolchain - stdlib ELF/interface toolkit
(exports, unwind-table function map, wrapper resolution, version delta,
crash address decode), callgraph walker, corpus annotator, and Ghidra
analysis/decompilation/name-map scripts with resumable parallel drivers.
* 570.144/annotations/: our name map (exports + resolved wrappers + verified
internals) and subsystem index, tracked so naming work accumulates.
* READ-ME-FIRST.md: reading guide with the fast lookup recipes.
The full decompiled corpus and annotated corpus stay untracked (vendor-
derived, gitignored under the version run/ tree).
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Move supporting detail to the adjacent local analysis notes (gitignored;
referenced by name from the public analysis) and ignore those notes tree-wide.
No behaviour or code changes.
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The host libcuda (570.211.01) has the identical engine-registration helper
instruction sequence (byte-pattern matched, host vaddr 0x454470 vs guest
0x453ef0). scripts/host_gdb_descriptor.sh runs cdt on the host under gdb and
prints the per-engine 6-dword registration record and the dispatch hook
target. Host registers a copy engine {3, 0xd, 4, 0xc5b5, 0x3e6, 3} and
cuCtxCreate succeeds; the guest registers GR {1, 1, 0, 0xc5c0, 0, 0} and
crashes - so the divergence is in the engine records the driver builds from
the emulated GSP static info engine table.
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Records that libcuda builds an async copy-engine list from per-engine records
(engine kind, runlist, class) received with the device information, which is
derived from the GSP static info engine table this project emulates, and that
the crashing per-engine helper operates on those records. The adjacent local analysis notes (userspace/cuda/570.144/LOCAL-ANALYSIS.md) carry supporting
detail.
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Documents the exact crash: cuInit/device enumeration now succeed; cuCtxCreate
faults in an engine-check/report path at libcuda+0x453f90 with rbp=0.
Register trace shows rbp valid at the helper and at the dispatch hook's
leave, but 0 immediately after the hook returns; the hook and the dispatch
table entries are all valid libcuda code. Adds the ioctl sequence observed
before the crash and lists what is still unanalysed.
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Analysis tooling for debugging CUDA execution in Open-IOV guests:
- userspace/cuda/570.144/: fetch a library from a running guest (nc),
objdump helpers, crash ip -> file vaddr + symbol mapping, and Ghidra
headless import/analysis/decompile scripts (project kept so single
functions decompile in seconds). The purpose is debugging correctness
and performance of CUDA in Open-IOV VMs (not a reimplementation);
extracted binaries and decompiled output are gitignored.
- tools/guest-diag/ioctl_trace.c: ptrace tracker for the NVIDIA driver
ioctls of a child (libcuda issues raw syscalls, so LD_PRELOAD sees
nothing). Decodes RM_ALLOC (class) and RM_CONTROL (cmd) arguments;
this is how the cuCtxCreate crash sequence was captured.
- tools/test/cuda_drv_test.c: unbuffered + per-call markers so a crash
identifies the CUDA call it happened in.
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