On (Tue) 05 Apr 2011 [12:17:30], Avi Kivity wrote: > >Guest kernel bug: CDROM change event missed, so the the revalidate > >call isn't made, which causes stale data (like disc size) to be used > >on newer media. > > > >qemu bug: We don't handle the GET_EVENT_STATUS_NOTIFICATION command > >from guests (which is a mandatory command acc. to scsi spec) which the > >guest uses to detect CDROM changes. Once this command is implemented, > >QEMU sends the required info the guest needs to detect CDROM changes. > >I have this implemented locally (also sent as RFC PATCH 2/3 in the > >'cdrom bug roundup' thread. > > > >So: even if qemu is updated to handle this command, the guest won't > >work correctly since it misses the event. > > Okay. We aren't responsible for guest kernel bugs, especially those > which apply to real hardware (we should make more effort for virtio > bugs). It's enough that we fix qemu here. Actually I forgot about this already: it is possible for a workaround in qemu: inject the event twice instead of once. ie, if the spec says 'SENSE_UNIT_ATTENTION' needs to be reset if some cmd is successful, don't reset it the first time. That's how I confirmed the kernel bug last week. It is such a horrible hack that I didn't want to keep it around at all :-) Amit -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list