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Date: Mon, 12 Oct 2009 17:43:39 +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
	spec compliant
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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 16:52, Gleb Natapov wrote:
> On Mon, Oct 12, 2009 at 04:50:35PM +0200, Gerd Hoffmann wrote:
>> 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.
>>
> But KVM doesn't support it (memory is always writable). And we want to reload
> BIOS on reboot for migration purposes.

Then it should be switched over to the new rom loader.  Also the logic 
which does *not* reload stuff which goes to IO_MEM_ROM must be turned 
off for kvm them.

cheers,
   Gerd