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

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Message-ID: <1350691333.6017.23.camel@sbsiddha-desk.sc.intel.com>
Date:	Fri, 19 Oct 2012 17:02:13 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, 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 Fri, 2012-10-19 at 16:36 -0700, H. Peter Anvin wrote:
> 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.

yes. Yinghai, if you remember you had a T420 that didn't show the
problem. And someone in the bugzilla with T420 had the problem. And
their dmidecode is
https://launchpadlibrarian.net/109393850/dmidecode.txt

What is the difference with your system? Bios I think is the same.

Can you see what we should check for in the dmi tables to black list
these systems? Can you post your T420's dmidecode to see the difference.

Bugs I have on this are:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999
https://bugzilla.kernel.org/show_bug.cgi?id=43054

thanks,
suresh

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