[Xen-devel] Re: PVFB: Add offset event?

[Markus Armbruster <armbru@xxxxxxxxxx>]

Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> writes:

> Samuel Thibault, le Tue 04 Mar 2008 16:12:20 +0000, a Ãcrit :
>> Markus Armbruster, le Tue 04 Mar 2008 16:48:20 +0100, a Ãcrit :
>> > I imagine (perhaps naively):
>> > 
>> > * The domU writes to a framebuffer provided by the frontend.
>> >
>> > * The framebuffer (not a copy of it) can be shared with the backend,
>> >   which only reads.
>> 
>> Well, that's not always the case, when the guest is in text mode for
>> instance, the PV shared buffer is converted from the guest text buffer.
>
> BTW, that leads me to another extension which would be useful: since
> the interface I have with the guest is the cirrus VGA card, I'm not
> supposed to know in advance where the guest will choose to make its
> frame buffer start, so at the same time of a resize event, or as an
> independant event, it would be useful to be able to tell the offset
> (within the big shared buffer) where the actual framebuffer starts.
>
> Samuel

I guess that could be worked into the dynamic modes feature.

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