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RE: [Xen-devel] [PATCH] patch to buffer write ioreq

Keir Fraser wrote:
> No, it would update a RAM virtual linear framebuffer which it would
> share with backend code running in domain 0.
OK, understood. But then we still need to periodically update screen 
to flush guest frame buffer out like 'updates graphics' did in current
In the meantime, we need to share part of VGA internal state between 
Qemu and Xen like graphic mode, bpp, palettes, screen width/height etc, 
and maybe dirty frame buffer track for fast flush out.

Yes, that definitely helps standard VGA but no meaning for cirrus
For cirrus logic, the frame buffer is directly mapped to guest so that 
guest write of frame buffer will not trigger VM EXIT (page fault). 

I am not sure if it is worth to moving VGA to Xen? The standard VGA is
rarely used.

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