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SubjectRe: [PATCH 0/6] AMD IOMMU updates
On Fri, 4 Jul 2008 11:52:13 +0200
Ingo Molnar <> wrote:

> * Joerg Roedel <> wrote:
> > Hi,
> >
> > this series of patches contain some updates to the AMD IOMMU code
> > currently in tip/master. The updates address some objections discussed
> > on the initial patches and also contain optimization and small code
> > cleanup. The code with these updates is tested on real hardware under
> > load and showed no problems.
> applied to tip/x86/amd-iommu and pushed that topic out, thanks Joerg.
> also, i've integrated it into tip/master as well (will push that out
> after some testing).
> The IOMMU driver code seems to be getting into good shape, so i've also
> added the topic to auto-x86-next, which means it will go into linux-next
> on the next iteration (in 1-2 days). Does anyone see any remaining
> problems?

Not a showstopper but I like to see the cleanups of the kernel
parameters, as I said before. The AMD IOMMU has two parameters,
amd_iommu=isolate and amd_iommu_size=32M|64M|128M|256M|512M|1G

The former might be useful for the VT-d. The latter is useful for most
of the IOMMU drivers. So I think that it would be better to make them
common parameters.

And if we can change the existing kernel parameters, I think that it
would be better to convert some of the x86 IOMMU parameters to common

BTW, "[PATCH 4/6] AMD IOMMU: honor iommu=off instead of amd_iommu=off"
patch in auto-x86-next needs update the kernel parameter.

From: FUJITA Tomonori <>
Subject: [PATCH] AMD IOMMU: fix kernel parameter

amd_iommu=off was replaced with a common parameter, iommu=off.

Signed-off-by: FUJITA Tomonori <>
Documentation/kernel-parameters.txt | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index cd98762..1a6bb46 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -274,7 +274,6 @@ and is between 256 and 4096 characters. It is defined in the file
amd_iommu= [HW,X86-84]
Pass parameters to the AMD IOMMU driver in the system.
Possible values are:
- off - disable the driver for AMD IOMMU
isolate - enable device isolation (each device, as far
as possible, will get its own protection

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