linux-kernel - Re: [PATCH] disable CPU side GART accesses

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Date:	Thu, 16 Oct 2008 10:43:56 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	bob.montgomery@...com
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vojtech@...e.cz" <vojtech@...e.cz>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"chandru@...ibm.com" <chandru@...ibm.com>,
	"Joerg Roedel" <joerg.roedel@....com>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Pavel Machek" <pavel@....cz>
Subject: Re: [PATCH] disable CPU side GART accesses

On Thu, Oct 16, 2008 at 10:00 AM, Bob Montgomery <bob.montgomery@...com> wrote:
>
> The problem occurs when the copy operation reads from the GART aperture
> (iommu window) and wakes up the GART translation hardware.  This patch
> stops that by telling the GART to ignore addresses that come from the
> CPU and to only translate addresses from the IO side.

why kdump need to copy those area? those area is supposed to be
reserved in e820 table by BIOS or first kernel.

YH
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