Re: [Xen-devel] [PATCH 3/3] libxl: introduce QEMU_HEADER

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 19 Jan 2012, Ian Campbell wrote:
> On Thu, 2012-01-19 at 12:13 +0000, Stefano Stabellini wrote:
> > Introduce a new QEMU_HEADER stored in the Qemu chunk right after the
> > QEMU_SIGNATURE and record length, before the Qemu state, to preserve the
> > physmap informations written by Qemu on xenstore.
> 
> I'm still of the opinion that this should be a new XC_SAVE_ID_*
> (possibly from a new range reserved for toolstakc use) and
> saved/restored via a separate callback from libxc.
> 
> The mess that is the tail of the save/restore protocol is pure
> historical and for backwards compat, we should not be making it any
> worse. An XC_SAVE_ID is exactly equivalent to adding something to the
> tail but uses the extensibility mechanism which we have now built into
> the protocol.

OK, I'll give it a look. I wasn't sure what was legacy and what was
not...

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