Re: [Qemu-devel] [6965] Implement and use shared memory framebuffer device rendering reoutine.

[Paul Brook]

> If we must use the map/unmap api for framebuffers (even though we know
> this memory is continuous in qemu) then we could map only the region
> we determined is dirty.

Maybe. In practice I doubt there's that much difference. In general we don't 
actually know the memory is contiguous, though for well behaved guests with 
current boards it probably is.  The proper solution is probably to replace 
l1_phys_map with an extent bases system, so that map time is not proportional 
to region size.

My main motivation for this patch is that it is the first step in eliminating 
phys_ram_base.

Paul