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Re: [Qemu-devel] [PATCH v2] wdt_i6300esb: fix vmstate versioning

From: Amit Shah
Subject: Re: [Qemu-devel] [PATCH v2] wdt_i6300esb: fix vmstate versioning
Date: Thu, 23 May 2013 16:54:29 +0530

On (Wed) 22 May 2013 [11:32:51], Michael Roth wrote:
> When this VMSD was introduced it's version fields were set to
> sizeof(I6300State), making them essentially random from build to build,
> version to version.
> To fix this, we lock in a high version id and low minimum version id to
> support old->new migration from all prior versions of this device's
> state. This should work since the device state has not changed since
> its introduction.
> The potentially breaks migration from 1.5+ to 1.5, but since the
> versioning was essentially random prior to this patch, new->old
> migration was not consistently functional to begin with.
> Reported-by: Nicholas Thomas <address@hidden>
> Suggested-by: Peter Maydell <address@hidden>
> Cc: address@hidden
> Signed-off-by: Michael Roth <address@hidden>
> ---
> v2:
>  * Fixed s/except/accept/ typo (Laszlo)

Reviewed-by: Amit Shah <address@hidden>


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