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

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Message-ID: <CAE9FiQWxYgCd2AVzXWfuqFA6NkgzgD0+XuAkUfEG1GN2EFBpTg@mail.gmail.com>
Date:	Mon, 12 Dec 2011 20:32:40 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"Berck E. Nash" <flyboy@...il.com>, Ingo Molnar <mingo@...e.hu>,
	"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 Mon, Dec 12, 2011 at 5:41 PM, Suresh Siddha
<suresh.b.siddha@...el.com> wrote:
> On Mon, 2011-12-12 at 17:29 -0800, Yinghai Lu wrote:
>> but i don't think bios buy can go that far to enable intr-remapping
>> without providing DMAR.
>
> We never know. And also It is not just bios. kexec'd kernel with out the
> interrupt-remapping support will also run into this issue and we should
> handle this also gracefully.

please check attached -v6 with print out as you requested.

Thanks

Yinghai

View attachment "nox2apic_v6.patch" of type "text/x-patch" (11313 bytes)