On Mon, Nov 02, 2009 at 11:42:11PM +0100, Alexander Graf wrote:

Am 02.11.2009 um 23:32 schrieb Ondrej Zajicek [off-list ref]:

quoted

On Mon, Nov 02, 2009 at 11:09:19PM +0100, Alexander Graf wrote:

quoted

When we want to create a full VirtIO based machine, we're still  
missing
graphics output. Fortunately, Linux provides us with most of the  
frameworks
to render text and everything, we only need to implement a transport.

So this is a frame buffer backend written for VirtIO. Using this and 
my
patch to qemu, you can use paravirtualized graphics.

Just a note: it might be useful to allow paravirtualized graphics to
handle text mode. In that case, it can be done in fbdev layer using
tileblit operations.

Is there any real driver implementing this already? I'd prefer to copy  
from working code instead of writing my own :-).

Yes, for example s3fb and vt8623fb (struct fb_tile_ops).

Also, we still need to keep the local frame buffer copy in sync so we  
can mmap and read from it, right? So it's not really worth it  
probably...

Advantages might be on Qemu side (like ability to run in text-only
mode without need to change console on virtualized sytem).

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago@crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."