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ee63fea005
Add an AES-XTS implementation "xts-aes-vaes-avx10_256" for x86_64 CPUs with the VAES, VPCLMULQDQ, and either AVX10/256 or AVX512BW + AVX512VL extensions. This implementation avoids using zmm registers, instead using ymm registers to operate on two AES blocks at a time. The assembly code is instantiated using a macro so that most of the source code is shared with other implementations. This is the optimal implementation on CPUs that support VAES and AVX512 but where the zmm registers should not be used due to downclocking effects, for example Intel's Ice Lake. It should also be the optimal implementation on future CPUs that support AVX10/256 but not AVX10/512. The performance is slightly better than that of xts-aes-vaes-avx2, which uses the same 256-bit vector length, due to factors such as being able to use ymm16-ymm31 to cache the AES round keys, and being able to use the vpternlogd instruction to do XORs more efficiently. For example, on Ice Lake, the throughput of decrypting 4096-byte messages with AES-256-XTS is 6.6% higher with xts-aes-vaes-avx10_256 than with xts-aes-vaes-avx2. While this is a small improvement, it is straightforward to provide this implementation (xts-aes-vaes-avx10_256) as long as we are providing xts-aes-vaes-avx2 and xts-aes-vaes-avx10_512 anyway, due to the way the _aes_xts_crypt macro is structured. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> |
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| certs | ||
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| README | ||
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 reStructuredText 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.