Re: x2apic boot failure on recent sandy bridge system

From: H. Peter Anvin
Date: Fri Oct 19 2012 - 19:36:46 EST

On 10/19/2012 04:32 PM, Yinghai Lu wrote:
On Fri, Oct 19, 2012 at 4:03 PM, Suresh Siddha
<suresh.b.siddha@xxxxxxxxx> wrote:
On Fri, 2012-10-19 at 13:42 -0700, rrl125@xxxxxxxxx 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

commit fb209bd891645bb87b9618b724f0b4928e0df3de
Author: Yinghai Lu <yinghai@xxxxxxxxxx>
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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