Given feedbacks from [1], it was suggested to separate two parts and to (re-)submit this patchset first.
To facilitate FSGSBASE, helper functions and refactoring work are incorporated. Also, it includes Andy's fix for accurate FS/GS base read and cleanup for the vDSO initialization. Changes from V3 [4]: * Unify CPU number initialization * Rebase on 4.18-rc1 Changes from V2 [3]: * Bisect the CPU number initialization patch * Drop patches for introducing i386 CPU_NUMBER and switching write_rdtscp_aux() to use wrmsr_safe() Changes from V1 [2]: * 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 * Switch write_rdtscp_aux() to use wrmsr_safe() [1] FSGSBASE patch set V2: https://lkml.org/lkml/2018/5/31/686 [2] infrastructure for FSGSBASE V1: https://lkml.org/lkml/2018/6/4/887 [3] V2: https://lkml.org/lkml/2018/6/6/582 [4] V3: https://lkml.org/lkml/2018/6/7/975 Andy Lutomirski (1): x86/fsgsbase/64: Make ptrace read FS/GS base accurately Chang S. Bae (6): 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/segments/64: Rename PER_CPU segment to CPU_NUMBER x86/vdso: Introduce CPU number helper functions 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/segment.h | 33 +++++++- arch/x86/include/asm/vgtod.h | 4 +- arch/x86/kernel/cpu/common.c | 28 +++++++ arch/x86/kernel/process_64.c | 181 +++++++++++++++++++++++++++++++--------- arch/x86/kernel/ptrace.c | 28 ++----- 9 files changed, 263 insertions(+), 106 deletions(-) create mode 100644 arch/x86/include/asm/fsgsbase.h -- 2.7.4
