Re: [Xen-devel] Question on save/restore mfn canonicalization

[Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>]

Well, when you're in school you don't have to care about breaking ABI's :)
So, the answer is then "no particular reason"?
Andres
John Levon wrote:
> On Fri, Sep 28, 2007 at 12:25:28PM -0400, Andres Lagar-Cavilla wrote:
>
>   
> > While exploring the paravirt save/restore code path, I noted a 
> > (seemingly) lack of consistency between where/who canonicalizes 
> > something and who un-canonicalizes. For example, the guest kernel 
> > canonicalizes the store and console mfn's in pre_suspend, but 
> > xc_domain_restore uncanonicalizes them before scheduling back the 
> > restored guest.
> > The question is if there is a mandatory reason for this, or is just the 
> > way the code was written. Can I, e.g, fill the 
> > pfn_to_mfn_frame_list(_list) entries from "outside" and remove that code 
> > from post_suspend, or will something break?
> >     
> You'll break the ABI. I don't know of a reason why it's so inconsistent.
>
> regards
> john
>   

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