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As part of the FF-A spec, an endpoint is allowed to transfer access of, or lend, a memory region to one or more borrowers. Extend the existing memory sharing implementation to support FF-A MEM_LEND functionality and expose this to other kernel drivers. Note that upon a successful MEM_LEND request the caller must ensure that the memory region specified is not accessed until a successful MEM_RECALIM call has been made. On systems with a hypervisor present this will been enforced, however on systems without a hypervisor the responsibility falls to the calling kernel driver to prevent access. Link: https://lore.kernel.org/r/20211015165742.2513065-1-marc.bonnici@arm.com Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Marc Bonnici <marc.bonnici@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.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 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.