diff --git a/pcap-common.c b/pcap-common.c
index 7cff6bfeb8..b13a92f973 100644
--- a/pcap-common.c
+++ b/pcap-common.c
@@ -1300,7 +1300,16 @@
  */
 #define LINKTYPE_DECT_NR	301
 
-#define LINKTYPE_HIGH_MATCHING_MAX	301		/* highest value in the "matching" range */
+/*
+ * Request serialization protocol used by edk2 firmware to communicate between
+ * normal mode and management mode ('MM' for short).
+ *
+ * The qemu uefi variable store implementation reuses the request serialization
+ * protocol for firmware <-> qemu communication.
+ */
+#define LINKTYPE_EDK2_MM	302
+
+#define LINKTYPE_HIGH_MATCHING_MAX	302		/* highest value in the "matching" range */
 
 /*
  * The DLT_ and LINKTYPE_ values in the "matching" range should be the
diff --git a/pcap.c b/pcap.c
index ebb0c9e978..9ca2a34b36 100644
--- a/pcap.c
+++ b/pcap.c
@@ -3324,6 +3324,7 @@ static struct dlt_choice dlt_choices[] = {
 	DLT_CHOICE(FIRA_UCI, "Ultra-wideband controller interface protocol"),
 	DLT_CHOICE(MDB, "Multi-Drop Bus"),
 	DLT_CHOICE(DECT_NR, "DECT New Radio"),
+	DLT_CHOICE(EDK2_MM, "edk2 mm request serialization protocol"),
 	DLT_CHOICE_SENTINEL
 };
 
diff --git a/pcap/dlt.h b/pcap/dlt.h
index affe7d1fc4..d8a271cbdd 100644
--- a/pcap/dlt.h
+++ b/pcap/dlt.h
@@ -1664,6 +1664,15 @@
  */
 #define DLT_DECT_NR		301
 
+/*
+ * Request serialization protocol used by edk2 firmware to communicate between
+ * normal mode and management mode ('MM' for short).
+ *
+ * The qemu uefi variable store implementation reuses the request serialization
+ * protocol for firmware <-> qemu communication.
+ */
+#define DLT_EDK2_MM		302
+
 /*
  * In case the code that includes this file (directly or indirectly)
  * has also included OS files that happen to define DLT_HIGH_MATCHING_MAX,
@@ -1675,6 +1684,6 @@
 #undef DLT_HIGH_MATCHING_MAX
 #endif
 
-#define DLT_HIGH_MATCHING_MAX	301	/* highest value in the "matching" range */
+#define DLT_HIGH_MATCHING_MAX	302	/* highest value in the "matching" range */
 
 #endif /* !defined(lib_pcap_dlt_h) */