Re: [Xen-devel][PATCH][IOEMU] Dynamic modes support for PV xenfb (2 of 2)

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Sat, Jan 12, 2008 at 08:46:46AM +0100, Markus Armbruster wrote:
> "Pat Campbell" <plc@xxxxxxxxxx> writes:
> 
> >>>> On Thu, Jan 10, 2008 at  3:18 AM, in message
> > <87ejcqhtku.fsf@xxxxxxxxxxxxxxxxx>, Markus Armbruster <armbru@xxxxxxxxxx>
> > wrote: 
> >> "Pat Campbell" <plc@xxxxxxxxxx> writes:
> >> 
> >>> Attached patch adds multiple frame buffer size support to the xenfb PV 
> >>> backend QEMU xenfb.  Backend sets feature-    resize and handles the
> >>> resize frame buffer event.
> >>>
> >>> Corresponding frontend LINUX patch is required for functionality but this
> >>> patch is not dependent on it, preserving backwards compatibility.
> [...]
> >> By the way, the feature negotiation only covers whether the frontend
> >> is permitted to resize, not acceptable resolutions.
> >
> > True.  Acceptable resolutions are what fits within a 5MB framebuffer
> > and has a width no greater than 1280.
> 
> Is this enough for all eternity?  Screen resolutions continue to
> grow...  If it's not, then how can we ensure that we can enlarge it
> easily while maintaining backwards compatibility?
> 
> Perhaps the backend could publish the maximum resolution it can
> accept, instead of just a flag that it can accept resize events.

Maximum resolutions are not well defined because they vary according
to your aspect ratio - normal vs widescreen. I increasingly like the
like of having a 'videoram' parameter in the backend config, so the
admin can set as large a value as they feel neccessary, and frontend
then set whatever resolutions they like within the constraint of that
value.

Regards,
Dan.
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