intel_iommu: fixing source id during IOTLB hash key calculation

Using uint8_t for source id will lose bus num and get the
wrong/invalid IOTLB entry. Fixing by using uint16_t instead and
enlarge level shift.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/i386/intel_iommu.c

@@ -218,7 +218,7 @@ static void vtd_reset_iotlb(IntelIOMMUState *s)
     g_hash_table_remove_all(s->iotlb);
 }
 
-static uint64_t vtd_get_iotlb_key(uint64_t gfn, uint8_t source_id,
+static uint64_t vtd_get_iotlb_key(uint64_t gfn, uint16_t source_id,
                                   uint32_t level)
 {
     return gfn | ((uint64_t)(source_id) << VTD_IOTLB_SID_SHIFT) |

hw/i386/intel_iommu_internal.h

@@ -115,7 +115,7 @@
 
 /* The shift of source_id in the key of IOTLB hash table */
 #define VTD_IOTLB_SID_SHIFT         36
-#define VTD_IOTLB_LVL_SHIFT         44
+#define VTD_IOTLB_LVL_SHIFT         52
 #define VTD_IOTLB_MAX_SIZE          1024    /* Max size of the hash table */
 
 /* IOTLB_REG */