static int ram_save_block(QEMUFile *f) { RAMBlock *block = last_block; ram_addr_t offset = last_offset; int bytes_sent = -1; MemoryRegion *mr; if (!block) block = QLIST_FIRST(&ram_list.blocks); do { mr = block->mr; if (memory_region_get_dirty(mr, offset, TARGET_PAGE_SIZE, DIRTY_MEMORY_MIGRATION)) { uint8_t *p; int cont = (block == last_block) ? RAM_SAVE_FLAG_CONTINUE : 0; memory_region_reset_dirty(mr, offset, TARGET_PAGE_SIZE, DIRTY_MEMORY_MIGRATION); p = memory_region_get_ram_ptr(mr) + offset; if (is_dup_page(p)) { save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS); qemu_put_byte(f, *p); bytes_sent = 1; } else { save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE); qemu_put_buffer(f, p, TARGET_PAGE_SIZE); bytes_sent = TARGET_PAGE_SIZE; } break; } offset += TARGET_PAGE_SIZE; if (offset >= block->length) { offset = 0; block = QLIST_NEXT(block, next); if (!block) block = QLIST_FIRST(&ram_list.blocks); } } while (block != last_block || offset != last_offset); last_block = block; last_offset = offset; return bytes_sent; }