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Using this HW assistance implies some constraints on the page table structure: - Regardless of the main page size used (4k or 16k), the level 1 table (PGD) contains 1024 entries and each PGD entry covers a 4Mbytes area which is managed by a level 2 table (PTE) containing also 1024 entries each describing a 4k page. - 16k pages require 4 identifical entries in the L2 table - 512k pages PTE have to be spread every 128 bytes in the L2 table - 8M pages PTE are at the address pointed by the L1 entry and each 8M page require 2 identical entries in the PGD. In order to use hardware assistance with 16K pages, this patch does the following modifications: - Make PGD size independent of the main page size - In 16k pages mode, redefine pte_t as a struct with 4 elements, and populate those 4 elements in __set_pte_at() and pte_update() - Adapt the size of the hugepage tables. - Define a PTE_FRAGMENT_NB so that a 16k page contains 4 page tables. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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.