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

[Anthony Liguori]

On 01/07/2010 03:40 AM, Dor Laor wrote:
> > There's no simple solution except to restrict features to what was
> > available on the first processors.
>
> What's not simple about the above 4 options?
> What's a better alternative (that insures users understand it and use 
> it and guest msi and even skype application is happy about it)?

Even if you have -cpu Nehalem, different versions of the KVM kernel 
module may additionally filter cpuid flags.

So if you had a 2.6.18 kernel and a 2.6.33 kernel, it may be necessary 
to say:

(2.6.33) qemu -cpu Nehalem,-syscall
(2.6.18) qemu -cpu Nehalem

In order to be compatible.

Regards,

Anthony Liguori