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Add functions for runtime allocation and free. This allocator and its algorithms are as simple as it gets. They do a linear search across all EPC sections and find the first free page. They are not NUMA-aware and only hand out individual pages. The SGX hardware does not support large pages, so something more complicated like a buddy allocator is unwarranted. The free function (sgx_free_epc_page()) implicitly calls ENCLS[EREMOVE], which returns the page to the uninitialized state. This ensures that the page is ready for use at the next allocation. Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Jethro Beekman <jethro@fortanix.com> Link: https://lkml.kernel.org/r/20201112220135.165028-10-jarkko@kernel.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.