Re: [PATCH v1 06/11] KVM: x86: use hardware-compatible format for APIC ID register

[Paolo Bonzini]

On 01/07/2016 16:54, Radim Krčmář wrote:
>> >                                                                (Hint: we
>> > want kvm-unit-tests for this).
> :) Something like this?
> 
>   enable_xapic()
>   id = apic_id()
>   set_apic_id(id+1) // ?
>   enable_x2apic()
>   id == apic_id() & 0xff
>   disable_apic()
>   enable_xapic()
>   id == apic_id()
> 

Yes, plus checking that it "moves" appropriately between low and high bits.

Thanks,

Paolo