diff --git a/hardware_chromeos.cc b/hardware_chromeos.cc
index 8c19aa7..d9c13a3 100644
--- a/hardware_chromeos.cc
+++ b/hardware_chromeos.cc
@@ -16,6 +16,8 @@
 
 #include "update_engine/hardware_chromeos.h"
 
+#include <utility>
+
 #include <base/files/file_path.h>
 #include <base/files/file_util.h>
 #include <base/logging.h>
@@ -180,6 +182,15 @@
   return utils::ParseECVersion(input_line);
 }
 
+int HardwareChromeOS::GetMinKernelKeyVersion() const {
+  return VbGetSystemPropertyInt("tpm_kernver");
+}
+
+bool HardwareChromeOS::SetMaxKernelKeyRollforward(int max_kernel_rollforward) {
+  return VbSetSystemPropertyInt("max_kernel_rollforward",
+                                max_kernel_rollforward) == 0;
+}
+
 int HardwareChromeOS::GetPowerwashCount() const {
   int powerwash_count;
   base::FilePath marker_path = base::FilePath(kPowerwashSafeDirectory).Append(