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James Morse 228a26b912 arm64: Use the clearbhb instruction in mitigations
Future CPUs may implement a clearbhb instruction that is sufficient
to mitigate SpectreBHB. CPUs that implement this instruction, but
not CSV2.3 must be affected by Spectre-BHB.

Add support to use this instruction as the BHB mitigation on CPUs
that support it. The instruction is in the hint space, so it will
be treated by a NOP as older CPUs.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
2022-02-24 14:02:44 +00:00
arch arm64: Use the clearbhb instruction in mitigations 2022-02-24 14:02:44 +00:00
block
certs
crypto
Documentation
drivers - Remove a bogus warning introduced by the recent PCI MSI irq affinity 2022-02-06 10:00:40 -08:00
fs Various bug fixes for ext4 fast commit and inline data handling. Also 2022-02-06 10:34:45 -08:00
include arm64: entry: Add vectors that have the bhb mitigation sequences 2022-02-16 13:16:08 +00:00
init
ipc
kernel perf/urgent contains 3 fixups: 2022-02-06 10:11:14 -08:00
lib
LICENSES
mm
net
samples
scripts
security
sound
tools perf tools fixes for v5.17: 1st batch 2022-02-06 10:18:23 -08:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.17-rc3 2022-02-06 12:20:50 -08:00
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.