On 6/15/26 09:35, Michael S. Tsirkin wrote:
+void qemu_ram_move(void *dest, const void *src, size_t n)
+{
+ if (HOST_UNALIGNED_MMIO_OK) {
+ switch (n) {
+ case 1:
+ __builtin_memmove(dest, src, 1);
+ break;
+ case 2:
+ __builtin_memmove(dest, src, 2);
+ break;
+ case 4:
+ __builtin_memmove(dest, src, 4);
+ break;
+ case 8:
+ __builtin_memmove(dest, src, 8);
+ break;
+ default:
+ memmove(dest, src, n);
+ }
+ } else {
+ qemu_ram_copy(dest, src, n);
+ }
+}
The qemu_ram_copy implementation above does not work with overlapping blocks.
IIUC copy is not supposed to. this is what move is for.
My point exactly. You therefore can't use copy to implement move.
r~
