linux-kernel - Re: x2apic boot failure on recent sandy bridge system

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Date:	Fri, 19 Oct 2012 16:36:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>, rrl125@...il.com,
	fa.linux.kernel@...glegroups.com,
	"Berck E. Nash" <flyboy@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: x2apic boot failure on recent sandy bridge system

On 10/19/2012 04:32 PM, Yinghai Lu wrote:
> On Fri, Oct 19, 2012 at 4:03 PM, Suresh Siddha
> <suresh.b.siddha@...el.com> wrote:
>> On Fri, 2012-10-19 at 13:42 -0700, rrl125@...il.com wrote:
>>> Any update? The messages just seem to have stopped months ago. A
>>> fallback would be nice, I have been booting the kernel with noa2xpic
>>> for since kernel 3.2, and currently I am working with 3.6.2.
>>>
>>> If needed I can try to attempt modifying the patch to include
>>> fallback, but I am probably not the best person to do it.
>>>
>>
>> Are you referring to this commit that made into the mainline tree
>> already?
>>
>> commit fb209bd891645bb87b9618b724f0b4928e0df3de
>> Author: Yinghai Lu <yinghai@...nel.org>
>> Date:   Wed Dec 21 17:45:17 2011 -0800
>>
>>      x86, x2apic: Fallback to xapic when BIOS doesn't setup interrupt-remapping
>
> I think his system has DMAR table and cpu support x2apic, So kernel
> will switch to x2apic,
>
> but somehow BIOS SMI handler has problem with x2apic. should be thinkpad W520?
>

Right, StinkPad W520 needs a quirk.


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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