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| author | Will Deacon <will.deacon@arm.com> | 2013-11-05 15:59:53 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2013-12-16 19:30:31 +0000 |
| commit | ca13bb3d4e54f5c30089e55d5b8f4bb80c8f05e2 (patch) | |
| tree | a8635a8d76bc772fc958b2a0abfad13db1fc56f2 /include | |
| parent | 06f983dd571f564bdd3eb2ac4c33002034ea7810 (diff) | |
| download | lwn-ca13bb3d4e54f5c30089e55d5b8f4bb80c8f05e2.tar.gz lwn-ca13bb3d4e54f5c30089e55d5b8f4bb80c8f05e2.zip | |
iommu: add IOMMU_EXEC flag for safely allowing XN mappings
Whilst most IOMMU mappings should probably be non-executable, there
may be cases (HSA?) where executable mappings are required.
This patch introduces a new mapping flag, IOMMU_EXEC, to indicate that
the mapping should be mapped as executable.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/iommu.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index a444c790fa72..709a697c4e02 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -24,9 +24,10 @@ #include <linux/types.h> #include <trace/events/iommu.h> -#define IOMMU_READ (1) -#define IOMMU_WRITE (2) -#define IOMMU_CACHE (4) /* DMA cache coherency */ +#define IOMMU_READ (1 << 0) +#define IOMMU_WRITE (1 << 1) +#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */ +#define IOMMU_EXEC (1 << 3) struct iommu_ops; struct iommu_group; |