Re: [Qemu-devel] cpuid problem in upstream qemu with kvm

[Alexander Graf]

On 21.12.2009, at 12:18, Michael S. Tsirkin wrote:

> On Mon, Dec 21, 2009 at 01:12:26PM +0200, 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.
> 
> How often does a casual user upgrade his host CPU?

I tend to have my VM images on an NFS share and expect them to work properly on 
all PCs I work on. So I guess the answer is "often"?

Alex