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6093cd582f
These three implementations of map_pages() all succeed if a mapping is requested with no read or write. Since they return back to __iommu_map() leaving the mapped output as 0 it triggers an infinite loop. Therefore nothing is using no-access protection bits. Further, VFIO and iommufd rely on iommu_iova_to_phys() to get back PFNs stored by map, if iommu_map() succeeds but iommu_iova_to_phys() fails that will create serious bugs. Thus remove this never used "nothing to do" concept and just fail map immediately. Fixes:e5fc9753b1("iommu/io-pgtable: Add ARMv7 short descriptor support") Fixes:e1d3c0fd70("iommu: add ARM LPAE page table allocator") Fixes:745ef1092b("iommu/io-pgtable: Move Apple DART support to its own file") Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Acked-by: Will Deacon <will@kernel.org> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/2-v1-1211e1294c27+4b1-iommu_no_prot_jgg@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.