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This is the common code to support a rework of the VMM backends. It adds support for more than 2 levels of page table nesting, which is required to be able to support GP100's MMU layout. Sparse mappings (that don't cause MMU faults when accessed) are now supported, where the backend provides it. Dual-PT handling had to become more sophisticated to support sparse, but this also allows us to support an optimisation the MMU provides on GK104 and newer. Certain operations can now be combined into a single page tree walk to avoid some overhead, but also enables optimsations like skipping PTE unmap writes when the PT will be destroyed anyway. The old backend has been hacked up to forward requests onto the new backend, if present, so that it's possible to bisect between issues in the backend changes vs the upcoming frontend changes. Until the new frontend has been merged, new backends will leak BAR2 page tables on module unload. This is expected, and it's not worth the effort of hacking around this as it doesn't effect runtime. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.