diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2011-12-01 15:49:45 +0100 |
|---|---|---|
| committer | Hiroshi DOYU <hdoyu@nvidia.com> | 2012-01-23 11:11:40 +0200 |
| commit | cea9c2d238f5adaae8afa0b20aa5fb91d694c954 (patch) | |
| tree | e1bffcb47740e98dc9a292ae12c2e9764a909f39 /Documentation/kernel-parameters.txt | |
| parent | f3c7fe5aa2b9ddcfbac4a64335a6139558645fc9 (diff) | |
iommu/amd: Put IOMMUv2 capable devices in pt_domain
If the device starts to use IOMMUv2 features the dma handles
need to stay valid. The only sane way to do this is to use a
identity mapping for the device and not translate it by the
iommu. This is implemented with this patch. Since this lifts
the device-isolation there is also a new kernel parameter
which allows to disable that feature.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 69255e88c72b..4d5c56502690 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -315,6 +315,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. is a lot of faster off - do not initialize any AMD IOMMU found in the system + force_isolation - Force device isolation for all + devices. The IOMMU driver is not + allowed anymore to lift isolation + requirements as needed. This option + does not override iommu=pt amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT |