iommu: Only allow iommu_map/unmap for paging domains

Check for the new __IOMMU_DOMAIN_PAGING flag before calling
into the iommu drivers ->map and ->unmap call-backs.

Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iommu.c

@@ -1063,6 +1063,9 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
 		     domain->ops->pgsize_bitmap == 0UL))
 		return -ENODEV;
 
+	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
+		return -EINVAL;
+
 	/* find out the minimum page size supported */
 	min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
 
@@ -1114,6 +1117,9 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
 		     domain->ops->pgsize_bitmap == 0UL))
 		return -ENODEV;
 
+	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
+		return -EINVAL;
+
 	/* find out the minimum page size supported */
 	min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);