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Re: [Qemu-ppc] [Qemu-devel] [PATCH 03/17] savevm: Implement VMS_DIVIDE f

From: David Gibson
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 03/17] savevm: Implement VMS_DIVIDE flag
Date: Tue, 9 Jul 2013 09:57:01 +1000
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, Jul 08, 2013 at 01:27:05PM -0500, Anthony Liguori wrote:
> Alexey Kardashevskiy <address@hidden> writes:
> > From: David Gibson <address@hidden>
> >
> > The vmstate infrastructure includes a VMS_MULTIPY flag, and associated
> > VMSTATE_VBUFFER_MULTIPLY helper macro.  These can be used to save a
> > variably sized buffer where the size in bytes of the buffer isn't directly
> > accessible as a structure field, but an element count from which the size
> > can be derived is.
> Why?  What's the point of sending the total size vs. the element
> count?

Because it's more convenient to work with the total size at runtime,
and because the VMSTATE stuff works with actual structure fields,
there's not really a way to convert it at migrate time, short of this.

David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!

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