Re: [Xen-devel] Hypercall-page initialization

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7 Feb 2006, at 18:04, Jacob Gorm Hansen wrote:

> > Or if you want to fill it in from within the domU, how about if we did
> > something like reserve some space of MSRs for Xen use (e.g., hex
> > Bxxxxxxx). Then we could say that, if the guest writes an MFN to a
> > particular one of those MSRs, it gets filled with hypercall-page
> > goodness. :-)
> Hmm would that work in paravirt mode also? I guess Xen would trap the
> exception and do the right thing? I suppose this has the advantage of
> avoiding any hardcoded trap vectors.
Yes, although it does sound kinda gross, it will work and ultimately I 
think it sounds quite attractive compared with the alternatives. Not 
sure how to decide what MSR range to pick to reserve... Apart from that 
it's trivial to implement.
 -- Keir


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