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From: Gerd Hoffmann <kraxel@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: jes sorensen <jes.sorensen@redhat.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	Markus Armbruster <armbru@redhat.com>,
	Juan Quintela <quintela@redhat.com>
Subject: Re: [Qemu-devel] migration: new sections and backward compatibility.
Date: Tue, 12 Jul 2011 16:50:24 +0200	[thread overview]
Message-ID: <4E1C5F30.2010502@redhat.com> (raw)
In-Reply-To: <4E15D280.8030508@codemonkey.ws>

   Hi,

>> Well, in case of usb hid devices breaking the guest isn't that a big
>> issue for at least some guests because they manage to reset the device
>> and continue nevertheless ...
>
> In a situation like this, I think our responsibility is to let the user
> know that there could be a problem, and provide the ability to the user
> to force the migration.
>
> So for instance, you could have a "(qemu) migrate_ignore_section usb"
> command or something like that.

Isn't that a bit overkill?

> But we shouldn't enable things that may sometimes work by default.

I certainly agree on that for the future, thats why there is the patch 
series which starts tagging devices without migration support.

This is about bug compatibility with old qemu versions though.  They 
used to migrate usb devices without saving any state, with surprisingly 
few issues.

cheers,
   Gerd

  reply	other threads:[~2011-07-12 14:50 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-06 16:04 [Qemu-devel] migration: new sections and backward compatibility Gerd Hoffmann
2011-07-06 17:13 ` Anthony Liguori
2011-07-07  7:19   ` Gerd Hoffmann
2011-07-07 15:36     ` Anthony Liguori
2011-07-12 14:50       ` Gerd Hoffmann [this message]
2011-07-07  9:23   ` Markus Armbruster
2011-07-07 11:02     ` Alexander Graf
2011-07-07 15:23       ` Paolo Bonzini
2011-07-11 15:32         ` Kevin Wolf
2011-07-11 15:31           ` Paolo Bonzini
2011-07-07 14:40     ` Gerd Hoffmann
2011-07-07 15:37     ` Anthony Liguori
2011-07-07 16:44       ` Markus Armbruster
2011-07-06 17:28 ` Avi Kivity
2011-07-06 20:01   ` Anthony Liguori
2011-07-06 23:32     ` Alexander Graf
2011-07-07  7:14       ` Gerd Hoffmann
2011-07-07  7:30         ` Avi Kivity
2011-07-08 13:02           ` Jes Sorensen
2011-07-08 14:43             ` Peter Maydell
2011-07-08 15:12               ` Gerd Hoffmann
2011-07-07 15:33       ` Anthony Liguori

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