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Re: [Qemu-block] CDROM Eject behaviour

From: Peter Lieven
Subject: Re: [Qemu-block] CDROM Eject behaviour
Date: Fri, 13 Mar 2015 12:05:55 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

Am 13.03.2015 um 12:00 schrieb Paolo Bonzini:
> On 13/03/2015 11:46, Peter Lieven wrote:
>> Hi,
>> I just stumbled across an old ticket where a user complains that an ejected 
>> CD is visible again after a reset.
>> It seems that the behaviour of qemu changed somewhen in the past (maybe 
>> years ago). I wonder
>> which behaviour would be correct or better.
>> If we eject a CD with the eject command via qmp or hmp we open the tray 
>> *AND* remove the media.
>> If the OS ejects a CD we just open the tray. So if the ATAPI or SCSI CDROM 
>> is resetted the tray is closed
>> and the CD is there again.
> IIRC this is because of another installer behavior.  Some of them do the
> following:
> - ask to start media check
> - at the end of media check, eject
> - if you choose to do another media check, load again.
> This is inconvenient on laptops, but it's worse on VMs.  For this
> reason, so to speak, we emulate a "desktop" CD-ROM reader rather than a
> "laptop" CD-ROM reader.

Ok, so there its not an obvious decision whats the right behaviour.

>> Its like we should behave like a tray CDROM or a slot-in CDROM.
>> A CD installer usually ejects the media after it has finished. Some ask to 
>> remove the media and press a key
>> some not.
>> Whats your opinion?
> You can use "-boot c,once=d" to work around QEMU's behavior, if it's not
> what the user likes.

Thats ok if we connect the CD on vServer startup and not later.
Or would this fall back to boot from CD if the Harddrive is unbootable?

Thank you,

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