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 <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
