[Qemu-devel] Re: [PATCH] introduce kvm64 CPU

[Andre Przywara]

Avi Kivity wrote:
> On 08/21/2009 12:34 AM, Andre Przywara wrote:
> > In addition to the TCG based qemu64 type let's introduce a kvm64 CPU 
> > type,
> > which is the least common denominator of all KVM-capable x86-CPUs
> > (based on Intel Pentium 4 Prescott). It can be used as a base type
> > for migration.
>>
> Typically users will want more specialized greatest common denomiator 
> cpu types; if a site has standardized on recent hardware they will want 
> the features of that hardware exposed.
Sure, but this was not the purpose of this patch. Currently KVM guests 
see a CPU type which is TCG dependent, so I just wanted to get rid of 
this. Features of TCG and features of the host processor are totally 
uncorrelated. This new type should be KVM's default, leaving -cpu host 
as the alternative for the non-migration case.

> I think this is best left to management software, which has more 
> information about the migration pool.
Sure.

Regards,
Andre.

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Andre Przywara
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