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    Subject[patch V2 00/28] x86/speculation: Remedy the STIBP/IBPB overhead
    Thats hopefully the final version of this. Changes since V1:

    - Renamed the command line option and related code to spectre_v2_user= as
    suggested by Josh.

    - Thought more about the back to back optimization and finally left the
    IBPB code in switch_mm().

    It still removes the ptrace check for the always IBPB case. That's
    substantial overhead for dubious value now that the default is
    conditional (prctl/seccomp) IBPB.

    - Added two options which allow conditional STIBP and IBPB always mode.

    - Addressed the review comments

    Documentation is still work in progress. Thanks Andi for providing the
    first draft for it.

    Still based on tip.git x86/pti as it has been discussed to remove the
    minimal RETPOLINE bandaid from stable kernels as well.

    It's avaiable from git:

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti


    Thanks,

    tglx

    8<------------------------

    Documentation/admin-guide/kernel-parameters.txt | 56 ++
    Documentation/userspace-api/spec_ctrl.rst | 9
    arch/x86/Kconfig | 8
    arch/x86/include/asm/msr-index.h | 5
    arch/x86/include/asm/nospec-branch.h | 14
    arch/x86/include/asm/spec-ctrl.h | 18
    arch/x86/include/asm/switch_to.h | 3
    arch/x86/include/asm/thread_info.h | 18
    arch/x86/include/asm/tlbflush.h | 8
    arch/x86/kernel/cpu/bugs.c | 520 ++++++++++++++++++------
    arch/x86/kernel/process.c | 79 ++-
    arch/x86/kernel/process.h | 39 +
    arch/x86/kernel/process_32.c | 10
    arch/x86/kernel/process_64.c | 10
    arch/x86/mm/tlb.c | 109 +++--
    include/linux/ptrace.h | 17
    include/linux/sched.h | 9
    include/linux/sched/smt.h | 20
    include/uapi/linux/prctl.h | 1
    kernel/cpu.c | 15
    kernel/ptrace.c | 10
    kernel/sched/core.c | 19
    kernel/sched/sched.h | 4
    tools/include/uapi/linux/prctl.h | 1
    24 files changed, 745 insertions(+), 257 deletions(-)

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