Running any modern browser (or Electron app, like VS Code) in a VM with no graphics acceleration is…quite an eye-opening experience.
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Maybe there's no way to do it without giving something too close to equivalent to execution permission (especially considering sidechannels, memory protection bypass, etc.) on the real host GPU, but I think it's a problem that merits a lot more research.
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Compiling to some virtual shader ISA in the guest, then performing a transformation that renders it much more checked (and slower) in software before passing it on to the shader compiler for the real GPU, seems at least plausible.
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