On 4/12/19 1:39 PM, Josh Poimboeuf wrote: > 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@xxxxxxxxxx> > --- > NOTE: This is based on top of Jeremy Linton's patches: > https://lkml.kernel.org/r/20190410231237.52506-1-jeremy.linton@xxxxxxx > > Documentation/admin-guide/kernel-parameters.txt | 8 +++++--- > arch/arm64/kernel/cpu_errata.c | 6 +++++- > arch/arm64/kernel/cpufeature.c | 8 +++++++- > 3 files changed, 17 insertions(+), 5 deletions(-) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index e84a01d90e92..79bfc755defe 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -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) Hi, Do we need to add "ARM64" to Documentation/admin-guide/kernel-parameters.rst? -- ~Randy
