diff options
| author | Fenghua Yu <fenghua.yu@intel.com> | 2011-05-11 19:51:05 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2011-05-18 00:22:00 -0400 |
| commit | de5397ad5b9ad22e2401c4dacdf1bb3b19c05679 (patch) | |
| tree | e8c612c4f84efe458d8ec3c23f1bfd834f20c0f2 /kernel/softirq.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 <fenghua.yu@intel.com>
LKML-Reference: <1305157865-31727-1-git-send-email-fenghua.yu@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'kernel/softirq.c')
0 files changed, 0 insertions, 0 deletions