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

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] patch to buffer write ioreq
From: "Dong, Eddie" <eddie.dong@xxxxxxxxx>
Date: Thu, 22 Jun 2006 23:12:17 +0800
Cc: "Han, Zhu" <zhu.han@xxxxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: [Xen-devel] [PATCH] patch to buffer write ioreq
Keir Fraser wrote:
> 
> Yes, we'd just move the whole lot of the logic. I'm not sure it's a
> good idea, but thought it worth suggesting.
OK, understand. Then it will be a lot of code movement.

> 
> For example -- I know that qemu 'updates graphics' on a polling timer
> loop. Would we need to have that in Xen to produce the final linear
> frame buffer, or could the VGA device model easily keep the
> framebuffer up to date as it goes (ie., on every mmio or port write)?

I may understand mistakely, I am not clear how Xen can manipulate 
HW frame buffer. It is under control of X-Windows or VNC server.

> If the former, it's not very attractive to put in Xen, but equally it
> would be nice to get rid of the polling loop whatever we end up
> doing. I'm unclear whether the polling is just for SDL/VNC updates.
> 
>   -- Keir
Eddie

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