hw/mem: Use memory_region_size() in cxl_type3

Accessors prefered over direct use of int128_get64() as they
clamp out of range values.  None are expected here but
cleaner to always use the accessor than mix and match.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-Id: <20230421160827.2227-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gregory Price <gregory.price@memverge.com>

hw/mem/cxl_type3.c

@@ -52,7 +52,7 @@ static int ct3_build_cdat_entries_for_mr(CDATSubHeader **cdat_table,
         .DSMADhandle = dsmad_handle,
         .flags = CDAT_DSMAS_FLAG_NV,
         .DPA_base = 0,
-        .DPA_length = int128_get64(mr->size),
+        .DPA_length = memory_region_size(mr),
     };
 
     /* For now, no memory side cache, plausiblish numbers */
@@ -133,7 +133,7 @@ static int ct3_build_cdat_entries_for_mr(CDATSubHeader **cdat_table,
         /* Reserved - the non volatile from DSMAS matters */
         .EFI_memory_type_attr = 2,
         .DPA_offset = 0,
-        .DPA_length = int128_get64(mr->size),
+        .DPA_length = memory_region_size(mr),
     };
 
     /* Header always at start of structure */
@@ -698,7 +698,7 @@ MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data,
         return MEMTX_ERROR;
     }
 
-    if (dpa_offset > int128_get64(mr->size)) {
+    if (dpa_offset > memory_region_size(mr)) {
         return MEMTX_ERROR;
     }
 
@@ -721,7 +721,7 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data,
         return MEMTX_OK;
     }
 
-    if (dpa_offset > int128_get64(mr->size)) {
+    if (dpa_offset > memory_region_size(mr)) {
         return MEMTX_OK;
     }
     return address_space_write(&ct3d->hostmem_as, dpa_offset, attrs,