[0/3] KVM: arm64: Fix a bug of single-step execution enabled by userspace

Message

Reiji Watanabe Sept. 9, 2022, 4:46 a.m. UTC

Fix a bug that KVM could erroneously perform an extra single step
execution (without returning to userspace) due to setting PSTATE.SS
to 1 on every guest entry, when single-step execution is enabled for
the vCPU by userspace.

Add a test for KVM_GUESTDBG_SINGLESTEP to the debug-exception test
to verify the single-step behavior.

The series is based on 6.0-rc4.

Reiji Watanabe (3):
  KVM: arm64: Don't set PSTATE.SS when Software Step state is
    Active-pending
  KVM: arm64: selftests: Refactor debug-exceptions to make it amenable
    to new test cases
  KVM: arm64: selftests: Add a test case for KVM_GUESTDBG_SINGLESTEP

 arch/arm64/include/asm/kvm_host.h             |   3 +
 arch/arm64/kvm/debug.c                        |  19 ++-
 arch/arm64/kvm/guest.c                        |   1 +
 arch/arm64/kvm/handle_exit.c                  |   2 +
 .../selftests/kvm/aarch64/debug-exceptions.c  | 149 +++++++++++++++++-
 5 files changed, 169 insertions(+), 5 deletions(-)


base-commit: 7e18e42e4b280c85b76967a9106a13ca61c16179