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Date: Mon, 12 Oct 2009 16:50:35 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Re: [PATCH 2/3] qemu: make cirrus init value pci
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To: Gleb Natapov <gleb@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, kvm-devel <kvm@vger.kernel.org>, "Michael S. Tsirkin" <mst@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Avi Kivity <avi@redhat.com>

On 10/12/09 15:53, Gleb Natapov wrote:
> On Mon, Oct 12, 2009 at 03:45:47PM +0200, Gerd Hoffmann wrote:
>>>>>> We should fix qemu to re-read bios from flash.
>>>>>> Makes sense?
>>>>>>
>>>>> We have option_rom_setup_reset() already.
>>>>
>>>> We don't, anymore :)
>>> We are fast! Well, we surely have something similar instead.
>>
>> Sure.  Try 'info roms'.  Everything listed there will be reloaded on
>> reset (unless mem=rom, in which case the guest should not be able to
>> modify the bits in the first place).  That includes vgabios,
>> optionroms, -kernel images, ...
>>
> And what about bios? I don't see it there.

pc.c does some magic here to map the complete bios into high memory and 
the legacy part at 0xe0000, thats why it is loaded in a different way. 
It gets loaded to IO_MEM_ROM memory though, so the guest should not be 
able to corrupt it.

cheers,
   Gerd