Re: [PATCH] KVM: x86/cpuid: Expose the true number of available ASIDs

[Like Xu]

On 15/7/2021 7:19 pm, Paolo Bonzini wrote:
> On 15/07/21 12:45, Like Xu wrote:
> > The original fixed number "8" was first introduced 11 years ago. Time has
> > passed and now let KVM report the true number of address space 
> > identifiers
> > (ASIDs) that are supported by the processor returned in Fn8000_000A_EBX.
> >
> > It helps user-space to make better decisions about guest values.
> >
> > -        entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
> > -                   ASID emulation to nested SVM */
>
> Why, since we don't have ASID emulation yet anyway?
>
> Paolo

I suppose you're right on the current state.

But do we have an explanation as to why it is hard-coded as 8
and not zero or a real supported number?