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| author | Fenghua Yu <[email protected]> | 2011-05-11 16:51:05 -0700 |
|---|---|---|
| committer | H. Peter Anvin <[email protected]> | 2011-05-17 21:22:00 -0700 |
| commit | de5397ad5b9ad22e2401c4dacdf1bb3b19c05679 (patch) | |
| tree | e8c612c4f84efe458d8ec3c23f1bfd834f20c0f2 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | dc23c0bccf5eea171c87b3db285d032b9a5f06c4 (diff) | |
x86, cpu: Enable/disable Supervisor Mode Execution Protection
Enable/disable newly documented SMEP (Supervisor Mode Execution Protection) CPU
feature in kernel. CR4.SMEP (bit 20) is 0 at power-on. If the feature is
supported by CPU (X86_FEATURE_SMEP), enable SMEP by setting CR4.SMEP. New kernel
option nosmep disables the feature even if the feature is supported by CPU.
[ hpa: moved the call to setup_smep() until after the vendor-specific
initialization; that ensures that CPUID features are unmasked. We
will still run it before we have userspace (never mind uncontrolled
userspace). ]
Signed-off-by: Fenghua Yu <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions