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

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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