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

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Date:	Fri, 19 Oct 2012 17:41:49 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.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 Fri, Oct 19, 2012 at 5:02 PM, Suresh Siddha
<suresh.b.siddha@...el.com> wrote:
> 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.

1.37 was working too, i updated it to 1.39 and it is still working.

>
> 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.
>
> https://bugzilla.kernel.org/show_bug.cgi?id=43054

post dmesg and dmidecode to that bug report.

Thanks

Yinghai
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