diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 16d2885fcc..68cb72a481 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2744,7 +2744,7 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
         return false;
     }
 
-    desc_type = inv_desc.lo & VTD_INV_DESC_TYPE;
+    desc_type = VTD_INV_DESC_TYPE(inv_desc.lo);
     /* FIXME: should update at first or at last? */
     s->iq_last_desc_type = desc_type;
 
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 5f32c36943..13d5d129ae 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -356,7 +356,8 @@ union VTDInvDesc {
 typedef union VTDInvDesc VTDInvDesc;
 
 /* Masks for struct VTDInvDesc */
-#define VTD_INV_DESC_TYPE               0xf
+#define VTD_INV_DESC_TYPE(val)          ((((val) >> 5) & 0x70ULL) | \
+                                         ((val) & 0xfULL))
 #define VTD_INV_DESC_CC                 0x1 /* Context-cache Invalidate Desc */
 #define VTD_INV_DESC_IOTLB              0x2
 #define VTD_INV_DESC_DEVICE             0x3
@@ -372,7 +373,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_WAIT_IF            (1ULL << 4)
 #define VTD_INV_DESC_WAIT_FN            (1ULL << 6)
 #define VTD_INV_DESC_WAIT_DATA_SHIFT    32
-#define VTD_INV_DESC_WAIT_RSVD_LO       0Xffffff80ULL
+#define VTD_INV_DESC_WAIT_RSVD_LO       0Xfffff180ULL
 #define VTD_INV_DESC_WAIT_RSVD_HI       3ULL
 
 /* Masks for Context-cache Invalidation Descriptor */
@@ -383,7 +384,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_CC_DID(val)        (((val) >> 16) & VTD_DOMAIN_ID_MASK)
 #define VTD_INV_DESC_CC_SID(val)        (((val) >> 32) & 0xffffUL)
 #define VTD_INV_DESC_CC_FM(val)         (((val) >> 48) & 3UL)
-#define VTD_INV_DESC_CC_RSVD            0xfffc00000000ffc0ULL
+#define VTD_INV_DESC_CC_RSVD            0xfffc00000000f1c0ULL
 
 /* Masks for IOTLB Invalidate Descriptor */
 #define VTD_INV_DESC_IOTLB_G            (3ULL << 4)
@@ -393,7 +394,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_IOTLB_DID(val)     (((val) >> 16) & VTD_DOMAIN_ID_MASK)
 #define VTD_INV_DESC_IOTLB_ADDR(val)    ((val) & ~0xfffULL)
 #define VTD_INV_DESC_IOTLB_AM(val)      ((val) & 0x3fULL)
-#define VTD_INV_DESC_IOTLB_RSVD_LO      0xffffffff0000ff00ULL
+#define VTD_INV_DESC_IOTLB_RSVD_LO      0xffffffff0000f100ULL
 #define VTD_INV_DESC_IOTLB_RSVD_HI      0xf80ULL
 #define VTD_INV_DESC_IOTLB_PASID_PASID  (2ULL << 4)
 #define VTD_INV_DESC_IOTLB_PASID_PAGE   (3ULL << 4)
@@ -406,7 +407,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_DEVICE_IOTLB_SIZE(val) ((val) & 0x1)
 #define VTD_INV_DESC_DEVICE_IOTLB_SID(val) (((val) >> 32) & 0xFFFFULL)
 #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
-#define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
+#define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0f1f0
 
 /* Rsvd field masks for spte */
 #define VTD_SPTE_SNP 0x800ULL