if (bdrv_get_type_hint(bs) == BDRV_TYPE_CDROM) {
s->drive_kind = IDE_CD;
bdrv_set_change_cb(bs, cdrom_change_cb, s);
+ bs->buffer_alignment = 2048;
} else {
if (!bdrv_is_inserted(s->bs)) {
error_report("Device needs media, but drive is empty");
s->bus = bus;
s->unit = unit;
s->drive_serial = drive_serial++;
- s->io_buffer = qemu_blockalign(s->bs, IDE_DMA_BUF_SECTORS*512 + 4);
+ /* we need at least 2k alignment for accessing CDROMs using O_DIRECT */
+ s->io_buffer = qemu_memalign(2048, IDE_DMA_BUF_SECTORS*512 + 4);
s->io_buffer_total_len = IDE_DMA_BUF_SECTORS*512 + 4;
s->smart_selftest_data = qemu_blockalign(s->bs, 512);
s->sector_write_timer = qemu_new_timer(vm_clock,