diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index baef525367b5..76e4a5bc79b4 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -919,6 +919,13 @@ struct acpi_iovt_iommu {
 	u32 device_entry_offset;
 };
 
+/* Masks for Flags field above */
+#define ACPI_IOVT_IOMMU_PCI_DEVICE		(1<<0)
+#define ACPI_IOVT_IOMMU_PXM_VALID		(1<<1)
+#define ACPI_IOVT_IOMMU_MAGAGE_BY_SEGMENT	(1<<2)
+#define ACPI_IOVT_IOMMU_HW_CAP_SUPPORT		(1<<3)
+#define ACPI_IOVT_IOMMU_MSI_INT_BYPASS		(1<<4)
+
 struct acpi_iovt_device_entry {
 	u8 type;
 	u8 length;