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Re: [Qemu-devel] [RFC 0/5]: QMP: Introduce GUEST_MEDIUM_EJECT & BLOCK_ME
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [RFC 0/5]: QMP: Introduce GUEST_MEDIUM_EJECT & BLOCK_MEDIUM_CHANGED |
Date: |
Fri, 10 Feb 2012 18:55:22 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0 |
Am 10.02.2012 18:04, schrieb Luiz Capitulino:
> This reminds me about an earlier try where I did the following, iirc:
>
> 1. added commands blockdev-tray-open, blockdev-tray-close,
> blockdev-medium-insert,
> blockdev-medium-remove
> 2. added the events: BLOCK_TRAY_OPEN, BLOCK_TRAY_CLOSE, BLOCK_MEDIUM_INSERTED
> BLOCK_MEDIUM_REMOVED, which would be emitted when the relating command is
> issued
> (maybe the events could just be BLOCK_TRAY_CHANGED & BLOCK_MEDIUM_CHANGED)
> 3. re-wrote eject and change in terms of the new commands, note that you get
> the
> events for free
>
> Now, maybe the guest eject could also emit BLOCK_TRAY_OPEN &
> BLOCK_TRAY_CLOSE. Then
> I think this is a complete solution.
>
> Do you guys agree?
Looks good to me in general. I'm not sure how you're imagining to
implement this, I would prefer not to emit events from the device code,
but only from block.c.
Another interesting point is what to do with host CD-ROM passthrough. I
think the TRAY_OPEN/CLOSE part is doable (do Paolo's patches actually do
that, so that we just need to add an event?). We would have to fake
MEDIUM_REMOVED/INSERTED immediately before a TRAY_CLOSE if the medium
has changed. LOCK/UNLOCK (which you forgot in your list) is only
initiated by the guest or monitor (eject -f), so there's nothing special
with passthrough.
Kevin
- [Qemu-devel] [PATCH 5/5] qmp: add the BLOCK_MEDIUM_CHANGED event, (continued)
- [Qemu-devel] [PATCH 5/5] qmp: add the BLOCK_MEDIUM_CHANGED event, Luiz Capitulino, 2012/02/07
- [Qemu-devel] [PATCH 4/5] qmp: add the GUEST_MEDIUM_EJECTED event, Luiz Capitulino, 2012/02/07
- [Qemu-devel] [PATCH 1/5] block: Rename bdrv_mon_event() & BlockMonEventAction, Luiz Capitulino, 2012/02/07
- Re: [Qemu-devel] [RFC 0/5]: QMP: Introduce GUEST_MEDIUM_EJECT & BLOCK_MEDIUM_CHANGED, Markus Armbruster, 2012/02/09
- Re: [Qemu-devel] [RFC 0/5]: QMP: Introduce GUEST_MEDIUM_EJECT & BLOCK_MEDIUM_CHANGED, Paolo Bonzini, 2012/02/10