Baby steps... this is just the basic CPUID and MSR definitions for AMD and Intel, followedby the complete no-brainer: Disable KPTI on Intel CPUs which set the RDCL_NO bit to say that they don't need it.
David Woodhouse (5): x86/cpufeatures: Add CPUID_7_EDX CPUID leaf x86/cpufeatures: Add Intel feature bits for Speculation Control x86/cpufeatures: Add AMD feature bits for Speculation Control x86/msr: Add definitions for new speculation control MSRs x86/pti: Do not enable PTI on fixed Intel processors arch/x86/include/asm/cpufeature.h | 7 +++++-- arch/x86/include/asm/cpufeatures.h | 14 +++++++++++--- arch/x86/include/asm/disabled-features.h | 3 ++- arch/x86/include/asm/msr-index.h | 12 ++++++++++++ arch/x86/include/asm/required-features.h | 3 ++- arch/x86/kernel/cpu/common.c | 11 +++++++++-- arch/x86/kernel/cpu/scattered.c | 2 -- 7 files changed, 41 insertions(+), 11 deletions(-) -- 2.7.4
