Re: [PATCH v5 7/8] KVM: VMX: Update PID-pointer table entry when APIC ID is changed

[Sean Christopherson]

On Tue, Jan 11, 2022, Maxim Levitsky wrote:
> Both Intel and AMD's PRM also state that changing APIC ID is implementation
> dependent.
>  
> I vote to forbid changing apic id, at least in the case any APIC acceleration
> is used, be that APICv or AVIC.

That has my vote as well.  For IPIv in particular there's not much concern with
backwards compability, i.e. we can tie the behavior to enable_ipiv.