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

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>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 code.
>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 logic:-(
>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.
>thx,eddie
>

So, what's the conclusion?
-Xin

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