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zeekayandHanzo Dev
6aa5b77a44
A GPU plugin replaces a VM's state transitions wholesale. Three of the four
seams reached one by dlsym'ing launcher names out of a library nothing had
identified, and all four would fall back to a bare filename — which makes the
dynamic loader's default search path, and in bridgevm's case the working
directory of whoever started the node, the thing that decides which code
computes consensus state.
A library exporting the five bridgevm launcher names and nothing else,
compiled from twenty lines of C that return 0:
before, LUX_GPU_PLUGIN_DIR=/tmp/rogue AutoBackend = hip
before, no env, cwd holds the .so AutoBackend = hip
after, either AutoBackend = none
The plugin header says a loader must check abi_version and vtbl_size. aivm,
bridgevm and mpcvm now do so before resolving a single launcher: a name was
the only thing being matched, and a name is not a contract.
Bare filenames and the CWD entry are gone. What is left is LUX_GPU_PLUGIN_DIR
and LUXCPP_PREFIX — places an operator named. Unset means no plugin, which is
the configuration every box without a GPU is already in.
Cherry-picked from 634df5e, whose quantumvm hunk is dropped: that seam's file
was deleted in 409d0e4 and the chain no longer loads a plugin.
Co-authored-by: Hanzo Dev <[email protected]>