Re: [Xen-devel] Hypercall-page initialization

["Jacob Gorm Hansen" <jacobg@xxxxxxx>]

On 2/7/06, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> 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.
hi,

I've bumped my head against this again, and a quick fix would be to
make the dom0 op unprivileged. If you can tell me where in the xen
source you would like op to be moved, I send in a patch for it.

Jacob

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