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Date:	Sun, 4 Apr 2010 10:53:38 +0200
From:	Joerg Roedel <>
To:	Bernhard Walle <>
Cc:	"Eric W. Biederman" <>,,, Joerg Roedel <>,,,
	Chris Wright <>,,,
Subject: Re: [PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash"

On Sun, Apr 04, 2010 at 09:24:30AM +0200, Bernhard Walle wrote:
> Am 03.04.10 19:49, schrieb Eric W. Biederman:
> > Not a problem.  We require a lot of things of the kdump kernel,
> > and it is immediately apparent in a basic sanity test.
> Also, in most cases (for example: distribution kernels), the kdump
> kernel nowadays is identical to the running kernel. So, if the running
> kernel has IOMMU support, the kdump kernel also has.

Yes, I know. But is that a requirement for kexec? If not we still
potentially have this problem. It is a smaller problem than
data-corruption caused by in-flight dma because most
people^Wdistributions indeed use the same kernel for normal boot and
kexec, thats true.


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