The Virtualbox SVGA card was derived out of the KVM VGA card, so there are 
quite a few similarities (I am deliberately being vague here as I am still in 
the process of discovering the features of both these cards completely). Having 
said that, the APIs and the data structures themselves have been modified to 
add new features (like displaying a custom bmp as the VGA bootup logo) and it 
has a custom vga bios as well.
Also, it is better that it be its own separate device model, so that 
maintenance of the vbox code becomes easier later. Further, I am thinking on 
the lines of retaining the VIrtualbox SVGA card code as is, and write a small 
KVM abstraction layer, so that it will be easy to port the bug fixes into the 
vbox SVGA card later on. 
Any comments/suggestions welcome here.

-Sriram



----- Original Message -----
From: Peter Maydell <peter.mayd...@linaro.org>
To: Sriram Murthy <srira...@yahoo.com>
Cc: Stefan Hajnoczi <stefa...@gmail.com>; qemu list <qemu-de...@nongnu.org>; 
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Sent: Monday, April 8, 2013 8:11 AM
Subject: Re: [Qemu-devel] Virtualbox svga card in KVM

On 6 April 2013 00:52, Sriram Murthy <srira...@yahoo.com> wrote:
> (actually, the virtualbox SVGA card is based off of the KVM VGA card)

Is it possible to implement it as an extension to the VGA
card device, or has it diverged incompatibly such that it
has to be its own separate device model?

thanks
-- PMM

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