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

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Message-ID: <CAE9FiQUmTnhCzvaxaHbwWbcxDrjYix91Yf8TZN6ob0W_Yz1csQ@mail.gmail.com>
Date:	Fri, 19 Oct 2012 16:32:38 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	rrl125@...il.com, fa.linux.kernel@...glegroups.com,
	"Berck E. Nash" <flyboy@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: x2apic boot failure on recent sandy bridge system

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?
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