Re: [PATCH v4] x86, vt-d: enable x2apic opt out

[Ingo Molnar]

* Youquan Song <youquan.song@xxxxxxxxx> wrote:

> New version of VT-d2 specification 
> (http://download.intel.com/technology 
> /computing/vptech/Intel(r)_VT_for_Direct_IO.pdf) includes a new 
> feature that provide firmware a way to request system software to 
> opt out of enable x2APIC mode. DMAR ACPI table newly define flags.1 
> bit: x2APIC_OPT_OUT which is set to request System software opt out 
> xAPIC mode if flags.0 bit:INTR_REMAP is also set.

So why isnt the x2apic disabled in the CPUID? That's the canonical 
way to unsupport a particular non-working CPU hw feature.

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/