On Tue, Aug 12, 2014 at 09:12:00PM +0200, Paolo Bonzini wrote: > Il 12/08/2014 20:55, Eduardo Habkost ha scritto: > > This makes the CPUID data change under the guest's feet during > > live-migration. > > > > Adding compat code to ensure older machine-types keep the old behavior > > is necessary, but in this specific case it is mostly harmless because > > 0x0 is documented as being equivalent to 0x40000001. > > > > (But I don't know how guests are supposed to behave when they see > > CPUID[KVM_CPUID_SIGNATURE_NEXT].EAX==0.) > > The only obvious thing to do would be to treat it as 0x40000101.
I just want to be sure the guests really do that. If we know guests won't do anything different with the CPUID change, I won't mind having no compat code for this. -- Eduardo
