linux-kernel - Re: [PATCH] x86-64: disable the GART before allocate aperture

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Date:	Fri, 22 Jun 2007 14:59:19 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Muli Ben-Yehuda" <muli@...ibm.com>, "Andi Kleen" <ak@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Vivek Goyal" <vgoyal@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86-64: disable the GART before allocate aperture

On 6/22/07, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> Alan Cox <alan@...rguk.ukuu.org.uk> writes:
>
> For a normal kexec we should shut everything down before the kernel
> transition so it should not be an issue.
>
> YH do you think you can look at simply reserving a portion of the iommu?
> And having the kexec on panic kernel use the reserved portion?
>
two copy region: one for first kernel, and one for second kernel? it
should work.
first kernel is using [64M, 128M), and the second will get assign to
[64M,128M) again.
when it try to memset to clear that region it will cause restart.
in that region, only first 256K can not touched, even read. rest could
be accessed.

YH
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