| Commit message (Collapse) | Author | Age |
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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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