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3e32131abc
On the Fujitsu-A64FX cores ver(1.0, 1.1), memory access may cause an undefined fault (Data abort, DFSC=0b111111). This fault occurs under a specific hardware condition when a load/store instruction performs an address translation. Any load/store instruction, except non-fault access including Armv8 and SVE might cause this undefined fault. The TCR_ELx.NFD1 bit is used by the kernel when CONFIG_RANDOMIZE_BASE is enabled to mitigate timing attacks against KASLR where the kernel address space could be probed using the FFR and suppressed fault on SVE loads. Since this erratum causes spurious exceptions, which may corrupt the exception registers, we clear the TCR_ELx.NFDx=1 bits when booting on an affected CPU. Signed-off-by: Zhang Lei <zhang.lei@jp.fujitsu.com> [Generated MIDR value/mask for __cpu_setup(), removed spurious-fault handler and always disabled the NFDx bits on affected CPUs] Signed-off-by: James Morse <james.morse@arm.com> Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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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.