Several of us have been investigating CD-ROM bugs. Let's update each other, make sure we're not duplicating effort, and see if we can help each other make progress.
= Stefan = Guests do not notice media change when using Linux host CD-ROM pass-through for two reasons: 1. QEMU is caching the device size for removable media and never updating it. 2. On Linux hosts the /dev/cdrom file descriptor needs to be reopened to refresh the underlying device size. Patches have been posted to qemu-devel. Libvirt does not recognize eject failure due to locked tray. This causes libvirt to get out-of-sync and believe the medium was successfully changed. A libvirt fix is in progress: https://bugzilla.redhat.com/show_bug.cgi?id=689101 = Anthony = Using 'change' or scripted commands without a delay between closing the BlockDriverState and opening the new CD-ROM. The guest does not have a chance to poll the drive and determine a medium present -> medium not present transition followed by a medium not present -> medium present transition. A fix for this does not exist yet and might be tricky since we need to delay or wait for the guest to poll once before opening the new CD-ROM. = Amit = Found that 2.6.38 and later guest kernels fail to report media change. The new in-kernel media change polling framework issues ATAPI commands which are not implemented in hw/ide/core.c. = Juan = ATA HSM violation errors after live migration while CD-ROM read operations. This is probably a hw/ide/* or DMA migration bug. = Markus = ? Stefan