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e75003a77f
Harald Freudenberger says: ==================== This series of patches has the goal to open up a do-not-allocate memory path from the callers of the pkey in-kernel api down to the crypto cards and back. The asynch in-kernel cipher implementations (and the s390 PAES cipher implementations are one of them) may be called in a context where memory allocations which trigger IO is not acceptable. So this patch series reworks the AP bus code, the zcrypt layer, the pkey layer and the pkey handlers to respect this situation by processing a new parameter xflags (execution hints flags). There is a flag PKEY_XFLAG_NOMEMALLOC which tells the code to not allocate memory which may lead to IO operations. To reach this goal, the actual code changes have been differed. The zcrypt misc functions which need memory for cprb build use a pre allocated memory pool for this purpose. The findcard() functions have one temp memory area preallocated and protected with a mutex. Some smaller data is not allocated any more but went to the stack instead. The AP bus also uses a pre-allocated memory pool for building AP message requests. Note that the PAES implementation still needs to get reworked to run the protected key derivation in a real asynchronous way. However, this rework of AP bus, zcrypt and pkey is the base work required before reconsidering the PAES implementation. The patch series starts bottom (AP bus) and goes up the call chain (PKEY). At any time in the patch stack it should compile. For easier review I tried to have one logic code change by each patch and thus keep the patches "small". ==================== Link: https://lore.kernel.org/r/20250424133619.16495-1-freude@linux.ibm.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
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| fs | ||
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| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
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| rust | ||
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| security | ||
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| virt | ||
| .clang-format | ||
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| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
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| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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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.