Re: [Qemu-devel] KVMs default CPU type

[Avi Kivity]

On 06/25/2009 11:11 AM, Andre Przywara wrote:
> I think we should go away from using qemu64 as a default for KVM. In 
> my opinion we should target -cpu host as KVM's default, while in 
> parallel create a -cpu migrate type (still fiddling with the CPUID 
> details of that), which takes over the qemu64 role of being some kind 
> of least common denominator. This should be a family 15 CPU (AMD K8 or 
> Intel P4) with a constant vendor ID (in my experiments Intel showed 
> less problems with guests). Since 64bit Windows has a whitelist of 
> known vendor IDs (AMD, Intel on XP, additionally Via on Win7) we 
> cannot use a bogus vendor, although this should impose the least 
> problems.

-cpu host may have issues other than migration; for example if you 
upgrade your host processor guests will notice and perhaps trigger a 
revalidation.  It also means every host offers something slightly 
different to guests, increasing the test matrix.

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