Re: [Xen-devel] Stability of shared info structs?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 30 Jul 2006, at 13:00, John Levon wrote:

> appears to have modified the size of struct arch_shared_info, as far as
> I know, after the interface was supposed to be stable. This would have
> broken any 3.0 domUs using the size of the shared_info structure for
> whatever reason. Was this an error, or is the implication that a domU
> cannot take the size of certain shared structures (and if so, which
> ones)?
Since shared_info is always in a Xen-provided page, we think it's okay 
to add extra entries to the end of it. I don't think we could get away 
with that with any of the other public structures.
We might add an extra field for introspection -- it depends precisely 
what it's for. There are one or two fields used for communicating 
between guest and tools, but that isn't what shared_info was originally 
intended for. It might, for example, be better to use xenstore.
 -- Keir


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