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 /drivers/iommu/amd_iommu_init.c | |
| 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 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index d1e5067852d4..7c3fd572a23b 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -146,6 +146,8 @@ u32 amd_iommu_max_pasids __read_mostly = ~0; bool amd_iommu_v2_present __read_mostly; +bool amd_iommu_force_isolation __read_mostly; + /* * The ACPI table parsing functions set this variable on an error */ @@ -1642,6 +1644,8 @@ static int __init parse_amd_iommu_options(char *str) amd_iommu_unmap_flush = true; if (strncmp(str, "off", 3) == 0) amd_iommu_disabled = true; + if (strncmp(str, "force_isolation", 15) == 0) + amd_iommu_force_isolation = true; } return 1; |