Re: [Xen-devel] Re: More virtio users

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Tue, 2007-06-12 at 09:19 +1000, Rusty Russell wrote:
> > Rectangles work just fine for a framebuffer console.  They stop
> working 
> > once you plan to run any graphical stuff such as an X-Server on top
> of 
> > the framebuffer.  Only way to get notified about changes is page
> faults, 
> > i.e. 4k granularity on the linear framebuffer memory.
> 
> Yes, I discussed this with Ben Herrenschmidt a couple of months ago.
> It
> would be better to provide a fb ioctl which X could use to describe
> changed rectangles if available.  In the virtio case we could hand
> that
> information through, and other virtualized framebuffers would be able
> to
> use it similarly.

Yes, with the X damage extension, we can have precise notification of
changed areas.

Ben.