Given feedbacks from [1], it was asked to make first a few patches ready as soon as possible. To make FSGSBASE facilitated, some helper functions and refactoring work are incorporated. Besides that, it includes Andy's fix for accurate FS/GS base read and cleanup for the vDSO initialization.
Changes from V1: * Rename the x86-64 CPU_NUMBER segment from PER_CPU * Add i386 CPU_NUMBER equivalent to x86-64 at GDT entry 23 * Add additional helper function to store CPU number [1] FSGSBASE patch set V2: https://lkml.org/lkml/2018/5/31/686 [2] infrastructure to enable FSGSBASE V1: https://lkml.org/lkml/2018/6/4/887 Andy Lutomirski (1): x86/fsgsbase/64: Make ptrace read FS/GS base accurately Chang S. Bae (7): x86/fsgsbase/64: Introduce FS/GS base helper functions x86/fsgsbase/64: Use FS/GS base helpers in core dump x86/fsgsbase/64: Factor out load FS/GS segments from __switch_to x86/msr: write_rdtscp_aux() to use wrmsr_safe() x86/segments/64: Rename PER_CPU segment to CPU_NUMBER x86/segments/32: Introduce CPU_NUMBER segment x86/vdso: Move out the CPU number store arch/x86/entry/vdso/vgetcpu.c | 4 +- arch/x86/entry/vdso/vma.c | 38 +-------- arch/x86/include/asm/elf.h | 6 +- arch/x86/include/asm/fsgsbase.h | 47 +++++++++++ arch/x86/include/asm/msr.h | 2 +- arch/x86/include/asm/segment.h | 60 ++++++++++--- arch/x86/include/asm/vgtod.h | 4 +- arch/x86/kernel/cpu/common.c | 5 ++ arch/x86/kernel/process_64.c | 181 +++++++++++++++++++++++++++++++--------- arch/x86/kernel/ptrace.c | 28 ++----- arch/x86/kernel/setup_percpu.c | 25 ++++++ 11 files changed, 284 insertions(+), 116 deletions(-) create mode 100644 arch/x86/include/asm/fsgsbase.h -- 2.7.4
