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From: Ingo Molnar <mingo@elte.hu>
To: Youquan Song <youquan.song@intel.com>
Cc: linux-kernel@vger.kernel.org, david.woodhouse@intel.com,
	akpm@linux-foundation.org, tglx@linutronix.de, hpa@zytor.com,
	hpa@linux.intel.com, allen.m.kay@intel.com,
	suresh.b.siddha@intel.com, rajesh.sankaran@intel.com,
	asit.k.mallick@intel.com, kent.liu@intel.com,
	Youquan Song <youquan.song@linux.intel.com>
Subject: Re: [PATCH v4] x86, vt-d: enable x2apic opt out
Date: Wed, 25 May 2011 22:58:43 +0200	[thread overview]
Message-ID: <20110525205843.GC28397@elte.hu> (raw)
In-Reply-To: <1306341418-10645-1-git-send-email-youquan.song@intel.com>


* 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

  reply	other threads:[~2011-05-25 20:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-25 16:36 Youquan Song
2011-05-25 20:58 ` Ingo Molnar [this message]
2011-05-25 22:01   ` Thomas Gleixner
2011-05-25 23:37     ` Woodhouse, David
2011-06-09 15:34       ` Youquan Song

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