Linux kernel modifications for the Kernel Hacking exam
d86de40dec
We finalize caps before initializing kvm hyp code, and any use of cpus_have_const_cap() in kvm hyp code generates redundant and potentially unsound code to read the cpu_hwcaps array. A number of helper functions used in both hyp context and regular kernel context use cpus_have_const_cap(), as some regular kernel code runs before the capabilities are finalized. It's tedious and error-prone to write separate copies of these for hyp and non-hyp code. So that we can avoid the redundant code, let's automatically upgrade cpus_have_const_cap() to cpus_have_final_cap() when used in hyp context. With this change, there's never a reason to access to cpu_hwcaps array from hyp code, and we don't need to create an NVHE alias for this. This should have no effect on non-hyp code. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Acked-by: Will Deacon <will@kernel.org> Cc: David Brazdil <dbrazdil@google.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20201026134931.28246-4-mark.rutland@arm.com |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 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.