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iommu/uapi: Use named union for user data

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IOMMU UAPI data size is filled by the user space which must be validated
by the kernel. To ensure backward compatibility, user data can only be
extended by either re-purpose padding bytes or extend the variable sized
union at the end. No size change is allowed before the union. Therefore,
the minimum size is the offset of the union.

To use offsetof() on the union, we must make it named.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/linux-iommu/20200611145518.0c2817d6@x1.home/
Link: https://lore.kernel.org/r/1601051567-54787-4-git-send-email-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan
2020-09-25 09:32:44 -07:00
committed by Joerg Roedel
parent 1e6aaae93e
commit 8d3bb3b8cb
3 changed files with 14 additions and 14 deletions
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4
include/uapi/linux/iommu.h
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@@ -267,7 +267,7 @@ struct iommu_cache_invalidate_info {
union {
struct iommu_inv_pasid_info pasid_info;
struct iommu_inv_addr_info addr_info;
};
} granu;
};
/**
@@ -333,7 +333,7 @@ struct iommu_gpasid_bind_data {
/* Vendor specific data */
union {
struct iommu_gpasid_bind_data_vtd vtd;
};
} vendor;
};
#endif /* _UAPI_IOMMU_H */