Gerd Hoffmann <kraxel@xxxxxxx> writes:
> Hi,
>
> There is a problem with the virtual framebuffer: The page directory in
> the shared page (xenfb_page->pd[]) is unsigned long and thus has
> different sizes on 32bit and 64bit. The alignment is different too. And
> on top of that the frontend driver doesn't clear the shared page, which
> makes it difficult to autodetect the bitsize. I've tried nevertheless,
> patch (untested!) attached for comments. In the long run this code is
> supposed to be replaced by grant tables anyway, so it is probably okay
> to live with the hack for the time being. We could of course also fix
> the struct if we can afford breaking the interface. As it is quite new
> and probably (hmm, does fc6 ship it?) not widely used yet that might be
> an option.
Breaking the API now is right out of the question, I fear :)
You can evolve the API. Let the frontend put something in xenstore[*]
that lets the backend detect which page layout to use. Make sure the
backend can deal with old and new frontend. I doubt it's worthwhile
here.
Excuse my ignorance, but why do you have to guess the guest's size?
Doesn't dom0 know?
[*] I suggested to put version ID right into the page, but that was
shot down in favor of xenstore.
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