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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 21 Jun 2006, at 11:05, Li, Xin B wrote:

> > Couldn't we just have the VGA area as shared memory, like we do for
> > SVGA? Wouldn't that be faster and simpler?
> VGA graphics mode is much more complex than SVGA, since it has several
> modes and 4 plane, a pix color is decided by all of the 4 plane, and 
> one
> write to 4 plane may happen.
> At the beginning, we also have the same idea, but that's not so simple
> to implement.
Hmmm... fair point. I suppose supporting all the various modes, with 
bank switching etc., would be a pain. Probably significant changes to 
the vga device model.
How does win2k fail? Does it make assertions about device access 
latencies?
 -- Keir


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