[PATCH v4 0/6] KVM: s390: interrupt: Fix stepping into interrupt handlers

[Ilya Leoshkevich <iii@linux.ibm.com>]

v3: https://lore.kernel.org/kvm/20230724094716.91510-1-iii@linux.ibm.com/
v3 -> v4: Restore the per_event() macro (Claudio).

v2: https://lore.kernel.org/lkml/20230721120046.2262291-1-iii@linux.ibm.com/
v2 -> v3: Add comments, improve the commit messages (Christian, David).
          Add R-bs.
          Patches that need review: [4/6], [6/6].

v1: https://lore.kernel.org/lkml/20230629083452.183274-1-iii@linux.ibm.com/
v1 -> v2: Fix three more issues.
          Add selftests (Claudio).

Hi,

I tried to compare the behavior of KVM and TCG by diffing instruction
traces, and found five issues in KVM related to stepping into interrupt
handlers.

Best regards,
Ilya

Ilya Leoshkevich (6):
  KVM: s390: interrupt: Fix single-stepping into interrupt handlers
  KVM: s390: interrupt: Fix single-stepping into program interrupt
    handlers
  KVM: s390: interrupt: Fix single-stepping kernel-emulated instructions
  KVM: s390: interrupt: Fix single-stepping userspace-emulated
    instructions
  KVM: s390: interrupt: Fix single-stepping keyless mode exits
  KVM: s390: selftests: Add selftest for single-stepping

 arch/s390/kvm/intercept.c                     |  38 ++++-
 arch/s390/kvm/interrupt.c                     |  14 ++
 arch/s390/kvm/kvm-s390.c                      |  27 ++-
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../testing/selftests/kvm/s390x/debug_test.c  | 160 ++++++++++++++++++
 5 files changed, 229 insertions(+), 11 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/s390x/debug_test.c

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2.41.0