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s390: add automatic detection of the spectre defense

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[ Upstream commit 6e179d6412 ]

Automatically decide between nobp vs. expolines if the spectre_v2=auto
kernel parameter is specified or CONFIG_EXPOLINE_AUTO=y is set.

The decision made at boot time due to CONFIG_EXPOLINE_AUTO=y being set
can be overruled with the nobp, nospec and spectre_v2 kernel parameters.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Schwidefsky 2018-04-27 07:36:39 +02:00 • committed by Greg Kroah-Hartman
commit 719b84c9ae
6 changed files with 52 additions and 38 deletions
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