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commit11c439a194upstream. IOMMU v2 page table supports 4 level (47 bit) or 5 level (56 bit) virtual address space. Current code assumes it can support 64bit IOVA address space. If IOVA allocator allocates virtual address > 47/56 bit (depending on page table level) then it will do wrong mapping and cause invalid translation. Hence adjust aperture size to use max address supported by the page table. Reported-by: Jerry Snitselaar <jsnitsel@redhat.com> Fixes:aaac38f614("iommu/amd: Initial support for AMD IOMMU v2 page table") Cc: <Stable@vger.kernel.org> # v6.0+ Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Link: https://lore.kernel.org/r/20230518054351.9626-1-vasant.hegde@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de> [ Modified to work with "V2 with 4 level page table" only - Vasant ] Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 Restructured Text 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.