Re: [tip: x86/cpu] x86/cpufeatures: Add {REQUIRED,DISABLED} feature configs

[Ingo Molnar]

* H. Peter Anvin <hpa@xxxxxxxxx> wrote:

> >+config X86_DISABLED_FEATURE_FRED
> >+	def_bool y
> >+	depends on !X86_FRED
> >+
> >+config X86_DISABLED_FEATURE_SEV_SNP
> >+	def_bool y
> >+	depends on !KVM_AMD_SEV
> >+
> >+config X86_DISABLED_FEATURE_INVLPGB
> >+	def_bool y
> >+	depends on !BROADCAST_TLB_FLUSH
> 
> I think it is worth noting that the list here was intentionally 
> unchanged from the previous definitions, but that several of these 
> could and probably should be overhauled.

Yeah, note that this list was *not* unchanged since the -v1 submission, 
there's two new dependencies we added since -v1 which ended with the 
FRED entry:

 - X86_DISABLED_FEATURE_INVLPGB dependency we added today, which is due 
   to a new feature freshly merged into tip:x86/mm.

 - X86_DISABLED_FEATURE_SEV_SNP was added a bit back - that too is a 
   fresh sub-feature.

So we are aware, but we are also limited by what we notice. :-)

> For example, CPUID is actually required by any i586+ configuration.

Mind sending patches for anything you can think of? This series is now 
headed for v6.15 via tip:x86/cpu, modulo any unexpected catastrophes in 
-next testing.

Thanks,

	Ingo