Messages in this thread |  | | | Date | Wed, 25 May 2011 22:58:43 +0200 | | From | Ingo Molnar <> | | Subject | Re: [PATCH v4] x86, vt-d: enable x2apic opt out |
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* 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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