Index: lld/ELF/Config.h
===================================================================
--- lld/ELF/Config.h
+++ lld/ELF/Config.h
@@ -144,6 +144,7 @@
   std::vector<llvm::StringRef> undefined;
   std::vector<SymbolVersion> dynamicList;
   std::vector<uint8_t> buildIdVector;
+  std::vector<llvm::StringRef> PassPlugins;
   llvm::MapVector<std::pair<const InputSectionBase *, const InputSectionBase *>,
                   uint64_t>
       callGraphProfile;
Index: lld/ELF/Driver.cpp
===================================================================
--- lld/ELF/Driver.cpp
+++ lld/ELF/Driver.cpp
@@ -1252,6 +1252,8 @@
       error(arg->getSpelling() + ": unknown plugin option '" + arg->getValue() +
             "'");
 
+  config->PassPlugins = args::getStrings(args, OPT_load_pass_plugins);
+
   // Parse -mllvm options.
   for (auto *arg : args.filtered(OPT_mllvm))
     parseClangOption(arg->getValue(), arg->getSpelling());
Index: lld/ELF/LTO.cpp
===================================================================
--- lld/ELF/LTO.cpp
+++ lld/ELF/LTO.cpp
@@ -144,6 +144,8 @@
 
   c.SampleProfile = std::string(config->ltoSampleProfile);
   c.UseNewPM = config->ltoNewPassManager;
+  for (llvm::StringRef &PluginFN : config->PassPlugins)
+    c.PassPlugins.push_back(std::string(PluginFN));
   c.DebugPassManager = config->ltoDebugPassManager;
   c.DwoDir = std::string(config->dwoDir);
 
Index: lld/ELF/Options.td
===================================================================
--- lld/ELF/Options.td
+++ lld/ELF/Options.td
@@ -714,3 +714,5 @@
     "Perform additional validation of the written dynamic relocations",
     "Do not perform additional validation of the written dynamic relocations">,
   Flags<[HelpHidden]>;
+
+defm load_pass_plugins: Eq<"load-pass-plugin", "Load passes from plugin library">;
Index: llvm/examples/Bye/Bye.cpp
===================================================================
--- llvm/examples/Bye/Bye.cpp
+++ llvm/examples/Bye/Bye.cpp
@@ -50,6 +50,11 @@
     [](const llvm::PassManagerBuilder &Builder,
        llvm::legacy::PassManagerBase &PM) { PM.add(new LegacyBye()); });
 
+static llvm::RegisterStandardPasses RegisterByeLTO(
+    llvm::PassManagerBuilder::EP_ModuleOptimizerEarly,
+    [](const llvm::PassManagerBuilder &Builder,
+       llvm::legacy::PassManagerBase &PM) { PM.add(new LegacyBye()); });
+
 /* New PM Registration */
 llvm::PassPluginLibraryInfo getByePluginInfo() {
   return {LLVM_PLUGIN_API_VERSION, "Bye", LLVM_VERSION_STRING,
Index: llvm/test/Feature/load_extension.ll
===================================================================
--- llvm/test/Feature/load_extension.ll
+++ llvm/test/Feature/load_extension.ll
@@ -5,6 +5,8 @@
 ; RUN: llvm-lto2 run %t.o %loadbye -wave-goodbye -use-new-pm=0 -o %t -r %t.o,somefunk,plx -r %t.o,junk,plx 2>&1 | FileCheck %s
 ; RUN: llvm-lto2 run %t.o %loadbye %loadnewpmbye -wave-goodbye -use-new-pm -o %t -r %t.o,somefunk,plx -r %t.o,junk,plx 2>&1 | FileCheck %s
 ; RUN: llvm-lto2 run %t.o %loadbye %loadnewpmbye -opt-pipeline="goodbye" -wave-goodbye -use-new-pm -o %t -r %t.o,somefunk,plx -r %t.o,junk,plx 2>&1 | FileCheck %s
+; RUN: ld.lld -%loadnewpmbye --lto-newpm-passes="goodbye" -mllvm=%loadbye -mllvm=-wave-goodbye %t.o 2>&1 | FileCheck %s
+; RUN: ld.lld -mllvm=%loadbye -mllvm=-wave-goodbye -plugin-opt=legacy-pass-manager %t.o 2>&1 | FileCheck %s
 ; REQUIRES: plugins, examples
 ; UNSUPPORTED: windows
 ; CHECK: Bye