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Date: Tue, 24 Jan 2012 12:27:27 +0100
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Subject: Re: [Qemu-devel] [PATCH v4 0/6] save/restore on Xen
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To: Avi Kivity <avi@redhat.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Jan Kiszka <jan.kiszka@siemens.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Gerd Hoffmann <kraxel@redhat.com>

On 01/24/2012 12:10 PM, Avi Kivity wrote:
>> But viewing RAM as just another device, having Xen only restore a
>> subset of devices should be a reasonable thing to do moving forward.
>> The main problem here I believe is that we have part of the VGA Bios
>> functionality in the hardware emulation.
>
> Doesn't the main BIOS clear the screen first thing at boot?  Not even
> sure the reset is needed.

Clearing the screen should only write to the RAM at 0xB8000 (and perhaps 
0xA0000 since IIRC it's where text-mode fonts lie).  The option ROM 
cannot even assume that the main BIOS knows about the VESA framebuffer, 
can it?

Paolo