Commit ca13bb3d authored Nov 05, 2013 by Will Deacon

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>

parent 06f983dd

include/linux/iommu.h

+4 −3

Original line number	Diff line number	Diff line
		@@ -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;