diff --git a/exec.c b/exec.c
index 08a30f6741..17808e38cb 100644
--- a/exec.c
+++ b/exec.c
@@ -2780,9 +2780,9 @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
 }
 
 static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
-                                 MemTxAttrs attrs, uint8_t *buf, hwaddr len);
+                                 MemTxAttrs attrs, void *buf, hwaddr len);
 static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
-                                  const uint8_t *buf, hwaddr len);
+                                  const void *buf, hwaddr len);
 static bool flatview_access_valid(FlatView *fv, hwaddr addr, hwaddr len,
                                   bool is_write, MemTxAttrs attrs);
 
@@ -3147,7 +3147,7 @@ static bool prepare_mmio_access(MemoryRegion *mr)
 /* Called within RCU critical section.  */
 static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
                                            MemTxAttrs attrs,
-                                           const uint8_t *buf,
+                                           const void *ptr,
                                            hwaddr len, hwaddr addr1,
                                            hwaddr l, MemoryRegion *mr)
 {
@@ -3155,6 +3155,7 @@ static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
     uint64_t val;
     MemTxResult result = MEMTX_OK;
     bool release_lock = false;
+    const uint8_t *buf = ptr;
 
     for (;;) {
         if (!memory_access_is_direct(mr, true)) {
@@ -3194,7 +3195,7 @@ static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
 
 /* Called from RCU critical section.  */
 static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
-                                  const uint8_t *buf, hwaddr len)
+                                  const void *buf, hwaddr len)
 {
     hwaddr l;
     hwaddr addr1;
@@ -3211,7 +3212,7 @@ static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
 
 /* Called within RCU critical section.  */
 MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
-                                   MemTxAttrs attrs, uint8_t *buf,
+                                   MemTxAttrs attrs, void *ptr,
                                    hwaddr len, hwaddr addr1, hwaddr l,
                                    MemoryRegion *mr)
 {
@@ -3219,6 +3220,7 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
     uint64_t val;
     MemTxResult result = MEMTX_OK;
     bool release_lock = false;
+    uint8_t *buf = ptr;
 
     for (;;) {
         if (!memory_access_is_direct(mr, false)) {
@@ -3256,7 +3258,7 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
 
 /* Called from RCU critical section.  */
 static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
-                                 MemTxAttrs attrs, uint8_t *buf, hwaddr len)
+                                 MemTxAttrs attrs, void *buf, hwaddr len)
 {
     hwaddr l;
     hwaddr addr1;
diff --git a/include/exec/memory.h b/include/exec/memory.h
index e85b7de99a..6f8084f45e 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -2336,7 +2336,7 @@ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
 MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
                                     MemTxAttrs attrs, uint8_t *buf, hwaddr len);
 MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
-                                   MemTxAttrs attrs, uint8_t *buf,
+                                   MemTxAttrs attrs, void *buf,
                                    hwaddr len, hwaddr addr1, hwaddr l,
                                    MemoryRegion *mr);
 void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);