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

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Message-ID: <20070623100824.3d96186e@the-village.bc.nu>
Date:	Sat, 23 Jun 2007 10:08:24 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <ak@...e.de>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	Yinghai Lu <Yinghai.Lu@....com>,
	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

> But I doubt this was YH's problem - the panic kernel memory
> is always reserved and there shouldn't be any ongoing DMAs in this
> area anyways. And what happens outside the kdump kernel shouldn't matter.

In the kdump case it looks like there is still DMA going on through the
GART on some systems when kdump zaps it.
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