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Ard Biesheuvel
35bde68bba
When support for RNDR/RNDRRS was introduced, we elected to only implement arch_get_random_seed_int/_long(), and back them by RNDR instead of RNDRRS. This was needed to prevent potential performance and/or starvation issues resulting from the fact that the /dev/random driver used to invoke these routines on various hot paths. These issues have all been addressed now [0] [1], and so we can wire up this API more straight-forwardly: - map arch_get_random_int/_long() onto RNDR, which returns the output of a DRBG that is reseeded at an implemented defined rate; - map arch_get_random_seed_int/_long() onto the TRNG firmware service, which returns true, conditioned entropy, or onto RNDRRS if the TRNG service is unavailable, which returns the output of a DRBG that is reseeded every time it is used. [0]390596c995random: avoid arch_get_random_seed_long() when collecting IRQ randomness [1]2ee25b6968random: avoid superfluous call to RDRAND in CRNG extraction Cc: Andre Przywara <andre.przywara@arm.com> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20220113131239.1610455-1-ardb@kernel.org Signed-off-by: Will Deacon <will@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.