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Date: Sun, 11 Oct 2009 20:10:24 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [Qemu-devel] Re: [PATCH 2/3] qemu: make cirrus init value pci
	spec compliant
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To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Gleb Natapov <gleb@redhat.com>, kvm-devel <kvm@vger.kernel.org>

On Sun, Oct 11, 2009 at 07:28:13PM +0200, Avi Kivity wrote:
> On 10/11/2009 07:27 PM, Avi Kivity wrote:
>> So we are fine then? After reset new BIOS will get used?
>>
>> Yes.
>>
>
> I meant, we are fine for upgrade, and no, the new BIOS will not be used.  
> The file is only read once.

So this is what happens:
- after migration from old qemu to new old BIOS is used until reset
- after reset new BIOS is used
- after upgrade from old version of qemu upgrade does not have any
  effect until qemu is restarted

If this is a fair summary, the only issue with fixing BIOS bug
is migration from new qemu to old qemu, and we do not care much.


> -- 
> Do not meddle in the internals of kernels, for they are subtle and quick to panic.