diff --git a/OvmfPkg/Include/IndustryStandard/Virtio.h b/OvmfPkg/Include/IndustryStandard/Virtio.h
index 622a8deef0..e5abe1bd6e 100644
--- a/OvmfPkg/Include/IndustryStandard/Virtio.h
+++ b/OvmfPkg/Include/IndustryStandard/Virtio.h
@@ -34,6 +34,13 @@
 #define VIRTIO_SUBSYSTEM_9P_TRANSPORT       9
 #define VIRTIO_SUBSYSTEM_MAC80211_WLAN      10
 
+//
+// VirtIo Device Specific Configuration Offsets
+//
+#define VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI             20
+#define VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI_WITH_MSI_X  24
+#define VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_MMIO            0x100
+
 //
 // Data in the communication area is defined as packed and accessed as
 // volatile.