[PATCH v4 0/2] Fix single step for traps

[Julien Thierry]

When single stepping a trapped/emulated instruction, the instruction not
being actually executed, the PE ends up single stepping the instruction we
return to after ERET-ing from the trap.

First patch is just to avoid raw values when using single stepping
registers/bits.
Patches 2 fixes the issue for the kernel.

Changes since v1:
* Rename arm64_skip_trapped_instr to arm64_setup_next_instr
* Add defines for AARCH32 and Thumb instruction sizes
* Drop previous KVM patch, Alex Bennée has a better approach

Changes since v2:
* Move include in assembler.h to the right place
* Use user_fastforward_single_step to update single step state

Changes since v3:
* Add commit message for first patch
* Get rid of define for Thumb instruction sizes as they are ambiguous
* Rename arm64_setup_next_instr to arm64_skip_faulting_instruction

Cheers,

Julien Thierry (2):
  arm64: Use existing defines for mdscr
  arm64: Fix single stepping in kernel traps

 arch/arm64/include/asm/assembler.h   |  5 +++--
 arch/arm64/include/asm/insn.h        |  1 +
 arch/arm64/include/asm/traps.h       |  6 ++++++
 arch/arm64/kernel/armv8_deprecated.c |  8 ++++----
 arch/arm64/kernel/cpufeature.c       |  2 +-
 arch/arm64/kernel/traps.c            | 21 ++++++++++++++++-----
 6 files changed, 31 insertions(+), 12 deletions(-)

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1.9.1