diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 5829eedbf3ffffca51f1d4a73574fe4643039013..d568948d3a826f1cff353c81df8dfa1e1cceed67 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -806,6 +806,9 @@ struct acpi_iort_smmu_v3 {
 	u32 pri_gsiv;
 	u32 gerr_gsiv;
 	u32 sync_gsiv;
+	u8 pxm;
+	u8 reserved1;
+	u16 reserved2;
 };
 
 /* Values for Model field above */
@@ -818,6 +821,7 @@ struct acpi_iort_smmu_v3 {
 
 #define ACPI_IORT_SMMU_V3_COHACC_OVERRIDE   (1)
 #define ACPI_IORT_SMMU_V3_HTTU_OVERRIDE     (1<<1)
+#define ACPI_IORT_SMMU_V3_PXM_VALID         (1<<3)
 
 /*******************************************************************************
  *