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From: Paolo Bonzini <pbonzini@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 0/3] non-migratable devices
Date: Fri, 08 Jul 2011 12:17:45 +0200	[thread overview]
Message-ID: <4E16D949.2060305@redhat.com> (raw)
In-Reply-To: <4E16D4EF.5020903@redhat.com>

On 07/08/2011 11:59 AM, Gerd Hoffmann wrote:
>
>
>> For scsi-cd and other empty-but-generally-migratable devices we should
>> probably add an empty vmstate, so that any further addition can be done
>> as subsections.
>
> That will break migration to older versions which don't know about the
> new sections, even if they are empty ...

scsi-cd is new in 0.15, older versions have scsi-disk only.  That's why 
we should take the occasion to add the empty vmstate at least to it.

For other devices, it's better to make the breakage in a single version. 
  It also allows to make 0.15 the "flag day" where each device shall 
have a VMState or the entire VM will not be migratable.  If desired, in 
the future we can revert this behavior for pc-0.14 and earlier machines.

Paolo

  reply	other threads:[~2011-07-08 10:17 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-08  8:53 [Qemu-devel] [PATCH 0/3] non-migratable devices Gerd Hoffmann
2011-07-08  8:53 ` [Qemu-devel] [PATCH 1/3] vmstate: add no_migrate flag to VMStateDescription Gerd Hoffmann
2011-07-08 14:26   ` Anthony Liguori
2011-07-08 15:44     ` Gerd Hoffmann
2011-07-08 16:04       ` Gerd Hoffmann
2011-07-08 17:07         ` Anthony Liguori
2011-07-11  6:29           ` Gerd Hoffmann
2011-07-08  8:53 ` [Qemu-devel] [PATCH 2/3] ahci doesn't support migration Gerd Hoffmann
2011-07-08  8:53 ` [Qemu-devel] [PATCH 3/3] ehci " Gerd Hoffmann
2011-07-08  9:54 ` [Qemu-devel] [PATCH 0/3] non-migratable devices Paolo Bonzini
2011-07-08  9:59   ` Gerd Hoffmann
2011-07-08 10:17     ` Paolo Bonzini [this message]
2011-07-08 11:47       ` Gerd Hoffmann
2011-07-08 12:05         ` Paolo Bonzini
2011-07-08 12:47           ` Gerd Hoffmann
2011-07-08 12:59             ` Paolo Bonzini
2011-07-08 13:21               ` Gerd Hoffmann
2011-07-08 11:45     ` Markus Armbruster
2011-07-08 13:43 ` [Qemu-devel] [PATCH 4/3] vmstate: complain about devices without vmstate Gerd Hoffmann

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