From: ebiederm@xmission.com (Eric W. Biederman)
To: Bernhard Walle <bernhard@bwalle.de>
Cc: Joerg Roedel <joro@8bytes.org>,
nhorman@redhat.com, nhorman@tuxdriver.com,
Joerg Roedel <joerg.roedel@amd.com>,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Chris Wright <chrisw@sous-sol.org>,
hbabu@us.ibm.com, iommu@lists.linux-foundation.org,
vgoyal@redhat.com
Subject: Re: [PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash"
Date: Sun, 04 Apr 2010 00:51:10 -0700 [thread overview]
Message-ID: <m1pr2fhd01.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4BB83EAE.5090609@bwalle.de> (Bernhard Walle's message of "Sun\, 04 Apr 2010 09\:24\:30 +0200")
Bernhard Walle <bernhard@bwalle.de> writes:
> 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.
I have been rather pleasantly surprised at how well that works. Although
I am still glad I insisted that using the same kernel version not be a
hard requirement. It allowed us to specify a good solid interface.
How to cope with GART in that situation without having to manually specify
iommu=off in the configuration I find a more compelling question.
I expect I will have a look at that in the coming months if someone doesn't get
there before I do.
Eric
next prev parent reply other threads:[~2010-04-04 7:51 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-03 1:27 [PATCH 0/4] AMD IOMMU kdump fix plus cleanups (v2) Chris Wright
2010-04-03 1:27 ` [PATCH 1/4] x86/amd-iommu: enable iommu before attaching devices Chris Wright
2010-04-03 1:27 ` [PATCH 2/4] x86/amd-iommu: warn when issuing command to uninitialized cmd buffer Chris Wright
2010-04-03 1:27 ` [PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash" Chris Wright
2010-04-03 17:22 ` Joerg Roedel
2010-04-03 17:44 ` Eric W. Biederman
2010-04-04 8:44 ` Joerg Roedel
2010-04-04 9:16 ` Eric W. Biederman
2010-04-04 9:19 ` Eric W. Biederman
2010-04-03 17:41 ` Joerg Roedel
2010-04-03 17:49 ` Eric W. Biederman
2010-04-03 19:13 ` Joerg Roedel
2010-04-03 19:41 ` Eric W. Biederman
2010-04-04 7:24 ` Bernhard Walle
2010-04-04 7:51 ` Eric W. Biederman [this message]
2010-04-04 8:53 ` Joerg Roedel
2010-04-04 9:44 ` Eric W. Biederman
2010-04-04 10:01 ` Joerg Roedel
2010-04-06 17:42 ` Chris Wright
2010-04-06 17:51 ` Joerg Roedel
2010-04-06 20:39 ` Vivek Goyal
2010-04-06 21:13 ` Vivek Goyal
2010-04-06 21:45 ` Yinghai Lu
2010-04-06 22:10 ` Eric W. Biederman
2010-04-04 11:54 ` David Woodhouse
2010-04-03 1:27 ` [PATCH 4/4] x86/amd-iommu: use for_each_pci_dev Chris Wright
2010-04-07 10:05 ` [PATCH 0/4] AMD IOMMU kdump fix plus cleanups (v2) Joerg Roedel
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