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    Subject[patch V3 00/23] x86/entry: Consolidation part II (syscalls)
    Hi!

    This is the third version of the syscall entry code consolidation
    series. V2 can be found here:

    https://lore.kernel.org/r/20200308222359.370649591@linutronix.de

    It applies on top of

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/entry

    and is also available from git:

    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel entry-v3-part2

    The changes vs. V2:

    - A massive rework utilizing Peter Zijlstras objtool patches to analyze
    the new .noinstr.text section:

    https://lore.kernel.org/r/20200317170234.897520633@infradead.org

    Working with this was really helpful as it clearly pin pointed code
    which calls out of the protected section which is much more efficient
    and focussed than chasing everything manually.

    - Picked up the two RCU patches from Paul for completeness. The bugfix
    is required anyway and the comments have been really helpful to see
    where the defense line has to be.

    - As the tool flagged KVM as red zone, I looked at the context tracking
    usage there and it has similar if not worse issues. New set of patches
    dealing with that.

    Please have a close look at the approach and the resulting protected areas.

    Known issues:

    - The kprobes '.noinstr.text' exclusion currently works only for built
    in code. Haven't figured out how to to fix that, but I'm sure that
    Masami knows :)

    - The various SANitizers if enabled ruin the picture. Peter and I still
    have no brilliant idea what to do about that.

    Thanks,

    tglx
    ---
    arch/x86/entry/common.c | 173 ++++++++++++++++++++++++---------
    arch/x86/entry/entry_32.S | 24 ----
    arch/x86/entry/entry_64.S | 6 -
    arch/x86/entry/entry_64_compat.S | 32 ------
    arch/x86/entry/thunk_64.S | 45 +++++++-
    arch/x86/include/asm/bug.h | 3
    arch/x86/include/asm/hardirq.h | 4
    arch/x86/include/asm/irqflags.h | 3
    arch/x86/include/asm/nospec-branch.h | 4
    arch/x86/include/asm/paravirt.h | 3
    arch/x86/kvm/svm.c | 152 ++++++++++++++++++----------
    arch/x86/kvm/vmx/ops.h | 4
    arch/x86/kvm/vmx/vmenter.S | 2
    arch/x86/kvm/vmx/vmx.c | 78 +++++++++++---
    arch/x86/kvm/x86.c | 4
    b/include/asm-generic/bug.h | 9 +
    include/asm-generic/sections.h | 3
    include/asm-generic/vmlinux.lds.h | 4
    include/linux/compiler.h | 24 ++++
    include/linux/compiler_types.h | 4
    include/linux/context_tracking.h | 27 +++--
    include/linux/context_tracking_state.h | 6 -
    include/linux/irqflags.h | 6 +
    include/linux/sched.h | 1
    kernel/context_tracking.c | 14 +-
    kernel/kprobes.c | 11 ++
    kernel/locking/lockdep.c | 66 +++++++++---
    kernel/panic.c | 4
    kernel/rcu/tree.c | 91 +++++++++++------
    kernel/rcu/tree_plugin.h | 4
    kernel/rcu/update.c | 7 -
    kernel/trace/trace_preemptirq.c | 25 ++++
    lib/debug_locks.c | 2
    lib/smp_processor_id.c | 10 -
    scripts/mod/modpost.c | 2
    35 files changed, 590 insertions(+), 267 deletions(-)


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