[PATCH] D41723: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre..

[Chandler Carruth via Phabricator via llvm-commits]

chandlerc updated this revision to Diff 130532.
chandlerc added a comment.

Add the `lfence` instruction to all of the speculation capture loops, both
those generated by LLVM and those generated by LLD for the PLT.

This should ensure that both Intel and AMD processors stop speculating these
loops rather than continuing to consume resources (and power) uselessly.


Repository:
  rL LLVM

https://reviews.llvm.org/D41723

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Basic/Targets/X86.h
  clang/test/Driver/x86-target-features.c
  lld/ELF/Arch/X86.cpp
  lld/ELF/Arch/X86_64.cpp
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/test/ELF/i386-retpoline-nopic.s
  lld/test/ELF/i386-retpoline-pic.s
  lld/test/ELF/x86-64-retpoline-znow.s
  lld/test/ELF/x86-64-retpoline.s
  llvm/include/llvm/CodeGen/Passes.h
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/CodeGen/TargetPassConfig.h
  llvm/include/llvm/CodeGen/TargetSubtargetInfo.h
  llvm/include/llvm/InitializePasses.h
  llvm/lib/CodeGen/CMakeLists.txt
  llvm/lib/CodeGen/CodeGen.cpp
  llvm/lib/CodeGen/IndirectBrExpandPass.cpp
  llvm/lib/CodeGen/TargetPassConfig.cpp
  llvm/lib/CodeGen/TargetSubtargetInfo.cpp
  llvm/lib/Target/X86/CMakeLists.txt
  llvm/lib/Target/X86/X86.h
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86AsmPrinter.h
  llvm/lib/Target/X86/X86FastISel.cpp
  llvm/lib/Target/X86/X86FrameLowering.cpp
  llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/lib/Target/X86/X86InstrCompiler.td
  llvm/lib/Target/X86/X86InstrControl.td
  llvm/lib/Target/X86/X86InstrInfo.td
  llvm/lib/Target/X86/X86MCInstLower.cpp
  llvm/lib/Target/X86/X86RetpolineThunks.cpp
  llvm/lib/Target/X86/X86Subtarget.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/test/CodeGen/X86/O0-pipeline.ll
  llvm/test/CodeGen/X86/retpoline-external.ll
  llvm/test/CodeGen/X86/retpoline.ll
  llvm/test/Transforms/IndirectBrExpand/basic.ll
  llvm/tools/opt/opt.cpp

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