[PATCH v5 1/3] system/memory: Use memmove() for directly accessible regions

Similar to what's done in commit 4a73aee88140 ("softmmu: Use memmove in
flatview_write_continue"), there are more sites where the overlapping
source and destination buffer are allowed for the directly accessible
regions. Use memmove() in those sites, listed as below.

  hw/remote/vfio-user-obj.c::vfu_object_mr_rw
  include/system/memory.h::address_space_read
  system/physmem.c::flatview_read_continue_step

Signed-off-by: Gavin Shan <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Reviewed-by: Peter Xu <[email protected]>
---
 hw/remote/vfio-user-obj.c | 4 ++--
 include/system/memory.h   | 2 +-
 system/physmem.c          | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/hw/remote/vfio-user-obj.c b/hw/remote/vfio-user-obj.c
index 87fa7b6572..ea50270628 100644
--- a/hw/remote/vfio-user-obj.c
+++ b/hw/remote/vfio-user-obj.c
@@ -375,9 +375,9 @@ static int vfu_object_mr_rw(MemoryRegion *mr, uint8_t *buf, hwaddr offset,
         ram_ptr = memory_region_get_ram_ptr(mr);
 
         if (is_write) {
-            memcpy((ram_ptr + offset), buf, size);
+            memmove((ram_ptr + offset), buf, size);
         } else {
-            memcpy(buf, (ram_ptr + offset), size);
+            memmove(buf, (ram_ptr + offset), size);
         }
 
         return 0;
diff --git a/include/system/memory.h b/include/system/memory.h
index 2192fc9bdc..336d4e84a6 100644
--- a/include/system/memory.h
+++ b/include/system/memory.h
@@ -2741,7 +2741,7 @@ MemTxResult address_space_read(const AddressSpace *as, hwaddr addr,
             mr = flatview_translate(fv, addr, &addr1, &l, false, attrs);
             if (len == l && memory_access_is_direct(mr, false, attrs)) {
                 ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
-                memcpy(buf, ptr, len);
+                memmove(buf, ptr, len);
             } else {
                 result = flatview_read_continue(fv, addr, attrs, buf, len,
                                                 addr1, l, mr);
diff --git a/system/physmem.c b/system/physmem.c
index c21ea92915..2c42e365cb 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -3363,7 +3363,7 @@ static MemTxResult flatview_read_continue_step(MemTxAttrs attrs, uint8_t *buf,
         uint8_t *ram_ptr = qemu_ram_ptr_length(mr->ram_block, mr_addr, l,
                                                false, false);
 
-        memcpy(buf, ram_ptr, *l);
+        memmove(buf, ram_ptr, *l);
 
         return MEMTX_OK;
     }
-- 
2.55.0