[patch V4 part 4 00/24] x86/entry: Entry/exception code rework, nasty exceptions

[Thomas Gleixner]

Folks,

This is the forth part of the rework series. Part 3 can be found here:

 https://lore.kernel.org/r/20200505134354.774943181@xxxxxxxxxxxxx

The series has a total of 138 patches and is split into 5 parts. The base
for this 4th series is:

  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry-v4-part-3

The full series with all parts applied is available here:

  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry-v4-part-5

The forth part, i.e. this series is available from:

  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry-v4-part-4
 
This part contains the modifications for complex and nasty exceptions and traps:

 - Conversion of int3 including a full isolation of the text poke handler
   so it is fully self contained, i.e does not call out into any
   instrumentable code.

 - Conversion of NMI handling including protection against instrumentation

 - Conversion of #DB with separation of the user and kernel mode entries

 - Conversion of #MC and #DF

The objtool check for the noinstr.text correctness is not yet added to the
build machinery and has to be invoked manually for now:

   objtool check -fal vmlinux.o

The checking only works for builtin code as objtool cannot do a combined
analysis of vmlinux.o and a module.o

Thanks,

	tglx

8<----------
 arch/x86/entry/entry_32.S            |   38 ----
 arch/x86/entry/entry_64.S            |   35 +---
 arch/x86/include/asm/desc.h          |    8 
 arch/x86/include/asm/idtentry.h      |  235 +++++++++++++++++++++++++++++
 arch/x86/include/asm/mce.h           |    2 
 arch/x86/include/asm/ptrace.h        |    2 
 arch/x86/include/asm/text-patching.h |   11 -
 arch/x86/include/asm/traps.h         |   23 --
 arch/x86/kernel/alternative.c        |   25 +--
 arch/x86/kernel/cpu/common.c         |    6 
 arch/x86/kernel/cpu/mce/core.c       |   91 ++++++++---
 arch/x86/kernel/cpu/mce/inject.c     |    4 
 arch/x86/kernel/cpu/mce/internal.h   |    2 
 arch/x86/kernel/cpu/mce/p5.c         |    8 
 arch/x86/kernel/cpu/mce/winchip.c    |    8 
 arch/x86/kernel/doublefault_32.c     |   10 -
 arch/x86/kernel/hw_breakpoint.c      |    6 
 arch/x86/kernel/idt.c                |   22 +-
 arch/x86/kernel/nmi.c                |   14 -
 arch/x86/kernel/traps.c              |  283 ++++++++++++++++++++++++-----------
 arch/x86/kvm/vmx/vmx.c               |    2 
 arch/x86/xen/enlighten_pv.c          |   17 +-
 arch/x86/xen/xen-asm_64.S            |   12 -
 include/linux/bsearch.h              |   26 ++-
 kernel/time/timekeeping.c            |    2 
 lib/bsearch.c                        |   22 --
 26 files changed, 615 insertions(+), 299 deletions(-)