Re: [Qemu-devel] [PATCH v4 0/6] save/restore on Xen

[Avi Kivity]

On 01/24/2012 01:27 PM, Paolo Bonzini wrote:
> 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?

Yes, but why should anything else be needed?

When you switch to a graphics mode, clear as much of the framebuffer as
you need.

-- 
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