[XenPPC] Re: xencomm porting and "inline" handles

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mercredi 27 Septembre 2006 17:10, Hollis Blanchard a Ãcrit :
> On Wed, 2006-09-27 at 08:19 +0200, Tristan Gingold wrote:
> > Le Mardi 26 Septembre 2006 20:23, Hollis Blanchard a Ãcrit :
> > > On Tue, 2006-09-26 at 10:04 +0200, Tristan Gingold wrote:
> > > > After more work, inline xencomm is not that magic: it doesn't work
> > > > for modules which are loaded in virtual memory.  So I have to use
> > > > mini xencomm at least for modules.
> > >
> > > What's the problem with modules? Their text/data isn't physically
> > > contiguous, but where exactly is the problem?
> >
> > Inline xencomm only works for physically contiguous area because only the
> > base address is passed.  Therefore it doesn't work for modules.
>
> I understand that; please explain exactly what about the modules isn't
> working.
>
> For example, the stack used in kernel modules is still physically
> contiguous, so using stack-allocated data structures should work fine.
> However, making hypercalls directly using global data structures
> wouldn't work. However, the "inline" code is only being used for the
> hypercalls that could be made early. Is that the problem? Please
> identify the specific issue(s).
Yes, some hypercalls data are global data.
Sorry, I was not specific enough!

Tristan.

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