On Mon, Nov 02, 2009 at 11:42:11PM +0100, Alexander Graf wrote:
>
> Am 02.11.2009 um 23:32 schrieb Ondrej Zajicek <santiago@crfreenet.org>:
>
>> On Mon, Nov 02, 2009 at 11:09:19PM +0100, Alexander Graf wrote:
>>> 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."