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authorFenghua Yu <fenghua.yu@intel.com>2011-05-11 16:51:05 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2011-05-17 21:22:00 -0700
commitde5397ad5b9ad22e2401c4dacdf1bb3b19c05679 (patch)
treee8c612c4f84efe458d8ec3c23f1bfd834f20c0f2 /arch/avr32/mach-at32ap/intc.c
parentdc23c0bccf5eea171c87b3db285d032b9a5f06c4 (diff)
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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 'arch/avr32/mach-at32ap/intc.c')
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