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arm64/speculation: Support 'mitigations=' cmdline option

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Configure arm64 runtime CPU speculation bug mitigations in accordance
with the 'mitigations=' cmdline option.  This affects Meltdown, Spectre
v2, and Speculative Store Bypass.

The default behavior is unchanged.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
[will: reorder checks so KASLR implies KPTI and SSBS is affected by cmdline]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Josh Poimboeuf 2019-04-12 15:39:32 -05:00 • committed by Will Deacon
parent eb337cdfcd
commit a111b7c0f2
3 changed files with 17 additions and 5 deletions
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8
Documentation/admin-guide/kernel-parameters.txt
View file

@ -2545,8 +2545,8 @@
http://repo.or.cz/w/linux-2.6/mini2440.git
mitigations=
[X86,PPC,S390] Control optional mitigations for CPU
vulnerabilities. This is a set of curated,
[X86,PPC,S390,ARM64] Control optional mitigations for
CPU vulnerabilities. This is a set of curated,
arch-independent options, each of which is an
aggregation of existing arch-specific options.
@ -2555,11 +2555,13 @@
improves system performance, but it may also
expose users to several CPU vulnerabilities.
Equivalent to: nopti [X86,PPC]
kpti=0 [ARM64]
nospectre_v1 [PPC]
nobp=0 [S390]
nospectre_v2 [X86,PPC,S390]
nospectre_v2 [X86,PPC,S390,ARM64]
spectre_v2_user=off [X86]
spec_store_bypass_disable=off [X86,PPC]
ssbd=force-off [ARM64]
l1tf=off [X86]
auto (default)