linux-kernel - [PATCH v2 0/6] KVM: s390: interrupt: Fix stepping into interrupt handlers

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Date:   Fri, 21 Jul 2023 13:57:53 +0200
From:   Ilya Leoshkevich <iii@...ux.ibm.com>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Sven Schnelle <svens@...ux.ibm.com>, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jens Freimann <jfreimann@...hat.com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH v2 0/6] KVM: s390: interrupt: Fix stepping into interrupt handlers

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.

I'm not very familiar with the KVM code base, so please let me know if
the fixes can be improved or if these problems need to be handled
completely differently.

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 ISKE
  KVM: s390: selftests: Add selftest for single-stepping

 arch/s390/kvm/intercept.c                     |  39 ++++-
 arch/s390/kvm/interrupt.c                     |  10 ++
 arch/s390/kvm/kvm-s390.c                      |  20 ++-
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../testing/selftests/kvm/s390x/debug_test.c  | 160 ++++++++++++++++++
 5 files changed, 218 insertions(+), 12 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/s390x/debug_test.c

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2.41.0