diff --git a/llvm/include/llvm/Transforms/Instrumentation/MemorySanitizer.h b/llvm/include/llvm/Transforms/Instrumentation/MemorySanitizer.h
--- a/llvm/include/llvm/Transforms/Instrumentation/MemorySanitizer.h
+++ b/llvm/include/llvm/Transforms/Instrumentation/MemorySanitizer.h
@@ -19,11 +19,15 @@
 namespace llvm {
 
 struct MemorySanitizerOptions {
-  MemorySanitizerOptions() : MemorySanitizerOptions(0, false, false){};
-  MemorySanitizerOptions(int TrackOrigins, bool Recover, bool Kernel);
+  MemorySanitizerOptions() : MemorySanitizerOptions(0, false, false, false){};
+  MemorySanitizerOptions(int TrackOrigins, bool Recover, bool Kernel)
+      : MemorySanitizerOptions(TrackOrigins, Recover, Kernel, false) {}
+  MemorySanitizerOptions(int TrackOrigins, bool Recover, bool Kernel,
+                         bool EagerChecksRequested);
   bool Kernel;
   int TrackOrigins;
   bool Recover;
+  bool EagerChecksRequested;
 };
 
 // Insert MemorySanitizer instrumentation (detection of uninitialized reads)
diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -656,6 +656,8 @@
                     ParamName)
                 .str(),
             inconvertibleErrorCode());
+    } else if (ParamName == "param-retval") {
+      Result.EagerChecksRequested = true;
     } else {
       return make_error<StringError>(
           formatv("invalid MemorySanitizer pass parameter '{0}' ", ParamName)
diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
--- a/llvm/lib/Passes/PassRegistry.def
+++ b/llvm/lib/Passes/PassRegistry.def
@@ -412,7 +412,7 @@
                              return MemorySanitizerPass(Opts);
                            },
                           parseMSanPassOptions,
-                          "recover;kernel;track-origins=N")
+                          "recover;kernel;track-origins=N,param-retval")
 FUNCTION_PASS_WITH_PARAMS("simplifycfg",
                           "SimplifyCFGPass",
                            [](SimplifyCFGOptions Opts) {
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -493,6 +493,9 @@
   MemorySanitizer(Module &M, MemorySanitizerOptions Options)
       : CompileKernel(Options.Kernel), TrackOrigins(Options.TrackOrigins),
         Recover(Options.Recover) {
+    if (Options.EagerChecksRequested) {
+      ClEagerChecks = true;
+    }
     initializeModule(M);
   }
 
@@ -665,10 +668,13 @@
 
 } // end anonymous namespace
 
-MemorySanitizerOptions::MemorySanitizerOptions(int TO, bool R, bool K)
+MemorySanitizerOptions::MemorySanitizerOptions(int TO, bool R, bool K,
+                                               bool EagerChecksRequested)
     : Kernel(getOptOrDefault(ClEnableKmsan, K)),
       TrackOrigins(getOptOrDefault(ClTrackOrigins, Kernel ? 2 : TO)),
-      Recover(getOptOrDefault(ClKeepGoing, Kernel || R)) {}
+      Recover(getOptOrDefault(ClKeepGoing, Kernel || R)),
+      EagerChecksRequested(
+          getOptOrDefault(ClEagerChecks, EagerChecksRequested)) {}
 
 PreservedAnalyses MemorySanitizerPass::run(Function &F,
                                            FunctionAnalysisManager &FAM) {
@@ -695,7 +701,9 @@
     OS << "recover;";
   if (Options.Kernel)
     OS << "kernel;";
-  OS << "track-origins=" << Options.TrackOrigins;
+  OS << "track-origins=" << Options.TrackOrigins << ";";
+  if (Options.EagerChecksRequested)
+    OS << "param-retval;";
   OS << ">";
 }
 
diff --git a/llvm/test/Instrumentation/MemorySanitizer/msan_eager.ll b/llvm/test/Instrumentation/MemorySanitizer/msan_eager.ll
--- a/llvm/test/Instrumentation/MemorySanitizer/msan_eager.ll
+++ b/llvm/test/Instrumentation/MemorySanitizer/msan_eager.ll
@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -msan-check-access-address=0 -msan-track-origins=1 -msan-eager-checks -S -passes='module(msan-module),function(msan)' 2>&1 | \
 ; RUN:   FileCheck -allow-deprecated-dag-overlap --check-prefix=CHECK %s
+; RUN: opt < %s -msan-check-access-address=0 -msan-track-origins=1 -S -passes='msan<param-retval>' 2>&1 | \
+; RUN:   FileCheck -allow-deprecated-dag-overlap --check-prefix=CHECK %s
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"