int qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr) { RAMBlock *block; uint8_t *host = ptr; if (xen_enabled()) { *ram_addr = xen_ram_addr_from_mapcache(ptr); return 0; } QTAILQ_FOREACH(block, &ram_list.blocks, next) { /* This case append when the block is not mapped. */ if (block->host == NULL) { continue; } if (host - block->host < block->length) { *ram_addr = block->offset + (host - block->host); return 0; } } return -1; }