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Date: Mon, 21 Dec 2009 13:38:40 +0200
From: Yaniv Kaul <ykaul@redhat.com>
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Subject: Re: [Qemu-devel] cpuid problem in upstream qemu with kvm
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To: Avi Kivity <avi@redhat.com>
Cc: qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>, Gleb Natapov <gleb@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>

On 12/21/2009 1:12 PM, Avi Kivity wrote:
> On 12/20/2009 07:18 PM, Michael S. Tsirkin wrote:
>>
>>>> Hmm, then, shouldn't either kvm or qemu mask features that we do not
>>>> emulate well enough to make windows not crash?
>>> -cpu host does that already, no?
>>>
>>> Alex
>> I expected so, but Avi here seems to say windows will crash if you
>> use a new CPU with it ...
>
> No, Windows tries to detect changes in your hardware and assumes that 
> if too many things change, you might be a pirate and requires you to 
> phone their offices to re-authenticate.
>

'Just' the CPU is not big deal. Might hit you with two 'bad' points.
Network interface + CPU will require re-activation.
( http://www.aumha.org/win5/a/wpa.php )
Y.