diff --git a/qemu/include/exec/memattrs.h b/qemu/include/exec/memattrs.h
index ad4e18e9..651299a4 100644
--- a/qemu/include/exec/memattrs.h
+++ b/qemu/include/exec/memattrs.h
@@ -35,6 +35,18 @@ typedef struct MemTxAttrs {
     unsigned int secure:1;
     /* Memory access is usermode (unprivileged) */
     unsigned int user:1;
+    /* Requester ID (for MSI for example) */
+    unsigned int requester_id:16;
+    /*
+     * The following are target-specific page-table bits.  These are not
+     * related to actual memory transactions at all.  However, this structure
+     * is part of the tlb_fill interface, cached in the cputlb structure,
+     * and has unused bits.  These fields will be read by target-specific
+     * helpers using env->iotlb[mmu_idx][tlb_index()].attrs.target_tlb_bitN.
+     */
+    unsigned int target_tlb_bit0 : 1;
+    unsigned int target_tlb_bit1 : 1;
+    unsigned int target_tlb_bit2 : 1;
 } MemTxAttrs;
 
 /* Bus masters which don't specify any attributes will get this,