diff --git a/tensorflow/compiler/tf2xla/BUILD b/tensorflow/compiler/tf2xla/BUILD
index 07210dcf37c9e05672399c3e45fb3a2b19df65f9..f0e7791e9811533502fae0d4dea5a2e1ca2cf33c 100644
--- a/tensorflow/compiler/tf2xla/BUILD
+++ b/tensorflow/compiler/tf2xla/BUILD
@@ -662,5 +662,6 @@ cc_library(
     hdrs = ["side_effect_util.h"],
     deps = [
         "//tensorflow/core:core_cpu",
+        "@com_google_absl//absl/strings",
     ],
 )
diff --git a/tensorflow/compiler/tf2xla/side_effect_util.cc b/tensorflow/compiler/tf2xla/side_effect_util.cc
index 6cd7b24592f30d7202b985f3dfd082ea2d85e344..b233e6b2c28e1968bb74901fc684e808ae45ab60 100644
--- a/tensorflow/compiler/tf2xla/side_effect_util.cc
+++ b/tensorflow/compiler/tf2xla/side_effect_util.cc
@@ -15,6 +15,7 @@ limitations under the License.
 
 #include "tensorflow/compiler/tf2xla/side_effect_util.h"
 
+#include "absl/strings/numbers.h"
 #include "tensorflow/core/graph/algorithm.h"
 
 namespace tensorflow {
@@ -64,4 +65,28 @@ bool HasSideEffectingNodes(const Graph& g) {
   return false;
 }
 
+Status ParseHostComputeCoreList(absl::Span<const string> list_from_attr,
+                                std::map<string, int>* host_compute_core) {
+  for (const auto& hc_core : list_from_attr) {
+    std::vector<string> parts = str_util::Split(hc_core, ":");
+    if (parts.size() != 2) {
+      return errors::InvalidArgument(
+          "Malformed host_compute_core entry ", hc_core,
+          " should be <cluster_name>:<core_number>.");
+    }
+    int core;
+    if (!absl::numbers_internal::safe_strto32_base(parts[1], &core, 10)) {
+      return errors::InvalidArgument("Malformed host_compute_core entry ",
+                                     hc_core,
+                                     " part after ':' should be an integer.");
+    }
+    if (host_compute_core->find(parts[0]) != host_compute_core->end()) {
+      return errors::InvalidArgument(
+          "Duplicate host_compute_core entry for cluster ", parts[0]);
+    }
+    (*host_compute_core)[parts[0]] = core;
+  }
+  return Status::OK();
+}
+
 }  // namespace tensorflow
diff --git a/tensorflow/compiler/tf2xla/side_effect_util.h b/tensorflow/compiler/tf2xla/side_effect_util.h
index ad07624729f0b0d2443b2fc43d32dfa3377ce115..f22ddb2f58e1fa5c10ca0fdb956d9136942388b7 100644
--- a/tensorflow/compiler/tf2xla/side_effect_util.h
+++ b/tensorflow/compiler/tf2xla/side_effect_util.h
@@ -42,6 +42,12 @@ std::set<std::string> CalculateTokenInputsForOutputToken(const Graph& g);
 // Returns whether a graph contains side-effecting nodes.
 bool HasSideEffectingNodes(const Graph& g);
 
+// Parse the mapping from outside_compilation_subgraph name to core number,
+// which is specified in an attr as a list of strings
+// <subgraph_name>:<core_index>.
+Status ParseHostComputeCoreList(absl::Span<const string> list_from_attr,
+                                std::map<string, int>* host_compute_core);
+
 }  // namespace tensorflow
 
 #endif  // TENSORFLOW_COMPILER_TF2XLA_SIDE_EFFECT_UTIL_H_