Messages in this thread | | | Date | Mon, 14 Dec 2015 21:00:52 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH 24/32] x86, pkeys: actually enable Memory Protection Keys in CPU |
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On Mon, 14 Dec 2015, Dave Hansen wrote: > This sets the bit in 'cr4' to actually enable the protection > keys feature. We also include a boot-time disable for the > feature "nopku". > > Seting X86_CR4_PKE will cause the X86_FEATURE_OSPKE cpuid > bit to appear set. At this point in boot, identify_cpu() > has already run the actual CPUID instructions and populated > the "cpu features" structures. We need to go back and > re-run identify_cpu() to make sure it gets updated values. > > We *could* simply re-populate the 11th word of the cpuid > data, but this is probably quick enough. > > Also note that with the cpu_has() check and X86_FEATURE_PKU > present in disabled-features.h, we do not need an #ifdef > for setup_pku(). > > Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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