Re: [Xen-devel] Hypercall-page initialization

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

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

> We can make the hypercall for filling the page one that can be executed
> by unpriv domains (i.e., make it not a dom0_op).

That would be fine with me, though I guess purists would argue that it
would remove some flexibility, e.g. int 0x82 (or another hardcoded
trap vector) would have always have to be supported.

> 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.

>   -- Keir

Jacob

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