xen-all.c: fix multiply issue for int and uint types

If the two multiply operands are int and uint types separately,
the int type will be transformed to uint firstly, which is not the
intent in our code piece. The fix is to add (int64_t) transform
for the uint type before the multiply.
Signed-off-by: NDongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>

xen-all.c

@@ -712,7 +712,8 @@ static void cpu_ioreq_pio(ioreq_t *req)
 
             for (i = 0; i < req->count; i++) {
                 tmp = do_inp(req->addr, req->size);
-                cpu_physical_memory_write(req->data + (sign * i * req->size),
+                cpu_physical_memory_write(
+                        req->data + (sign * i * (int64_t)req->size),
                         (uint8_t *) &tmp, req->size);
             }
         }
@@ -723,7 +724,8 @@ static void cpu_ioreq_pio(ioreq_t *req)
             for (i = 0; i < req->count; i++) {
                 uint32_t tmp = 0;
 
-                cpu_physical_memory_read(req->data + (sign * i * req->size),
+                cpu_physical_memory_read(
+                        req->data + (sign * i * (int64_t)req->size),
                         (uint8_t*) &tmp, req->size);
                 do_outp(req->addr, req->size, tmp);
             }
@@ -740,12 +742,14 @@ static void cpu_ioreq_move(ioreq_t *req)
     if (!req->data_is_ptr) {
         if (req->dir == IOREQ_READ) {
             for (i = 0; i < req->count; i++) {
-                cpu_physical_memory_read(req->addr + (sign * i * req->size),
+                cpu_physical_memory_read(
+                        req->addr + (sign * i * (int64_t)req->size),
                         (uint8_t *) &req->data, req->size);
             }
         } else if (req->dir == IOREQ_WRITE) {
             for (i = 0; i < req->count; i++) {
-                cpu_physical_memory_write(req->addr + (sign * i * req->size),
+                cpu_physical_memory_write(
+                        req->addr + (sign * i * (int64_t)req->size),
                         (uint8_t *) &req->data, req->size);
             }
         }
@@ -754,16 +758,20 @@ static void cpu_ioreq_move(ioreq_t *req)
 
         if (req->dir == IOREQ_READ) {
             for (i = 0; i < req->count; i++) {
-                cpu_physical_memory_read(req->addr + (sign * i * req->size),
+                cpu_physical_memory_read(
+                        req->addr + (sign * i * (int64_t)req->size),
                         (uint8_t*) &tmp, req->size);
-                cpu_physical_memory_write(req->data + (sign * i * req->size),
+                cpu_physical_memory_write(
+                        req->data + (sign * i * (int64_t)req->size),
                         (uint8_t*) &tmp, req->size);
             }
         } else if (req->dir == IOREQ_WRITE) {
             for (i = 0; i < req->count; i++) {
-                cpu_physical_memory_read(req->data + (sign * i * req->size),
+                cpu_physical_memory_read(
+                        req->data + (sign * i * (int64_t)req->size),
                         (uint8_t*) &tmp, req->size);
-                cpu_physical_memory_write(req->addr + (sign * i * req->size),
+                cpu_physical_memory_write(
+                        req->addr + (sign * i * (int64_t)req->size),
                         (uint8_t*) &tmp, req->size);
             }
         }