[0/3] KVM: selftests: arm64 exception handling and debug test

Message

Ricardo Koller April 23, 2021, 4:03 a.m. UTC

Hi,

These patches add a debug exception test in aarch64 KVM selftests while
also adding basic exception handling support.

The structure of the exception handling is based on its x86 counterpart.
Tests use the same calls to initialize exception handling.  And both
architectures use vm_handle_exception() to override the handler for a
particular vector, or (vector, ec) in the arm64 case.

The debug test is similar to x86_64/debug_regs, except that the x86 one
controls the debugging from outside the VM. This proposed arm64 test
controls and handles debug exceptions from the inside.

The final patch adapts the x86 unhandled-vector reporting to use the
same mechanism as the one introduced for arm64 (UCALL_UNHANDLED instead
of direct x86 port IO).

Thanks,
Ricardo

Ricardo Koller (3):
  KVM: selftests: Add exception handling support for aarch64
  KVM: selftests: Add aarch64/debug-exceptions test
  KVM: selftests: Use a ucall for x86 unhandled vector reporting

 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +-
 .../selftests/kvm/aarch64/debug-exceptions.c  | 250 ++++++++++++++++++
 .../selftests/kvm/include/aarch64/processor.h |  86 ++++++
 .../testing/selftests/kvm/include/kvm_util.h  |   1 +
 .../selftests/kvm/include/x86_64/processor.h  |   2 -
 .../selftests/kvm/lib/aarch64/handlers.S      | 104 ++++++++
 .../selftests/kvm/lib/aarch64/processor.c     |  56 ++++
 .../selftests/kvm/lib/x86_64/processor.c      |  15 +-
 9 files changed, 506 insertions(+), 12 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/aarch64/debug-exceptions.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/handlers.S