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-rw-r--r--hw/i386/intel_iommu_internal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 2a9987fbc4..e1a08cb496 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -110,6 +110,8 @@
 /* Interrupt Address Range */
 #define VTD_INTERRUPT_ADDR_FIRST    0xfee00000ULL
 #define VTD_INTERRUPT_ADDR_LAST     0xfeefffffULL
+#define VTD_INTERRUPT_ADDR_SIZE     (VTD_INTERRUPT_ADDR_LAST - \
+                                     VTD_INTERRUPT_ADDR_FIRST + 1)
 
 /* The shift of source_id in the key of IOTLB hash table */
 #define VTD_IOTLB_SID_SHIFT         36