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

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Message-ID: <CAE9FiQXc6k+5gvknFHwWNHGPSN_Gw2CUzaJJWoSdn6Oz5t4dZQ@mail.gmail.com>
Date:	Sat, 10 Dec 2011 15:11:51 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Berck E. Nash" <flyboy@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: x2apic boot failure on recent sandy bridge system

On Sat, Dec 10, 2011 at 2:58 PM, Berck E. Nash <flyboy@...il.com> wrote:
> On 12/10/2011 01:17 PM, Yinghai Lu wrote:
>> your bios should not enable x2apic in this case.
>
> I am, in fact, able to disable x2apic in the BIOS and it works fine.  I
> was just under the impression that x2apic should be available and should
> work?  Is this wrong?  If so, then there's no kernel bug, and I just
> misunderstood.

it's not kernel bug.

BIOS need to provide DMAR table, so kernel could enable
intr-rempapping, and x2apic need intr-remap.

Thanks

Yinghai
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