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DateWed, 25 May 2011 22:58:43 +0200
FromIngo Molnar <>
SubjectRe: [PATCH v4] x86, vt-d: enable x2apic opt out

* Youquan Song <youquan.song@intel.com> 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


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