diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-02-18 22:04:08 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-14 19:18:43 +0200 |
| commit | 3e87b33f416fcdeaa29be85e1e4a1c43a0b66f1a (patch) | |
| tree | 0d7d019b5a0668358d6544db5828afffe5200218 /arch/x86/include | |
| parent | d72f9922d7d14c31fa690ea05fec7293fd9b0fd6 (diff) | |
x86/speculation/mds: Add mitigation control for MDS
commit bc1241700acd82ec69fde98c5763ce51086269f8 upstream
Now that the mitigations are in place, add a command line parameter to
control the mitigation, a mitigation selector function and a SMT update
mechanism.
This is the minimal straight forward initial implementation which just
provides an always on/off mode. The command line parameter is:
mds=[full|off]
This is consistent with the existing mitigations for other speculative
hardware vulnerabilities.
The idle invocation is dynamically updated according to the SMT state of
the system similar to the dynamic update of the STIBP mitigation. The idle
mitigation is limited to CPUs which are only affected by MSBDS and not any
other variant, because the other variants cannot be mitigated on SMT
enabled systems.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jon Masters <jcm@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index b12c8d70dd33..85ab25ac4d1d 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -988,4 +988,9 @@ enum l1tf_mitigations { extern enum l1tf_mitigations l1tf_mitigation; +enum mds_mitigations { + MDS_MITIGATION_OFF, + MDS_MITIGATION_FULL, +}; + #endif /* _ASM_X86_PROCESSOR_H */ |