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e93d5945ed
The iommufd self test uses an xarray to store the pfns and their orders to emulate a page table. Make it act more like a real iommu driver by replacing the xarray with an iommupt based page table. The new AMDv1 mock format behaves similarly to the xarray. Add set_dirty() as a iommu_pt operation to allow the test suite to simulate HW dirty. Userspace can select between several formats including the normal AMDv1 format and a special MOCK_IOMMUPT_HUGE variation for testing huge page dirty tracking. To make the dirty tracking test work the page table must only store exactly 2M huge pages otherwise the logic the test uses fails. They cannot be broken up or combined. Aside from aligning the selftest with a real page table implementation, this helps test the iommupt code itself. Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Samiullah Khawaja <skhawaja@google.com> Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Tested-by: Pasha Tatashin <pasha.tatashin@soleen.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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.