[v2,0/4] Test MSR exits to userspace

Message

Aaron Lewis Oct. 9, 2020, 11:46 a.m. UTC

This patchset adds additional testing to the series ("Allow user space to
restrict and augment MSR emulation") by Alexander Graf <[e-mail]>,
and supliments the selftest in that series.

This patchset introduces exception handling into the kvm selftest framework
which is then used in the test to be able to handle #GPs that are injected
into the guest from userspace.

The test focuses on two main areas:
  1) It tests the MSR filter API.
  2) It tests MSR permission bitmaps.

v1 -> v2:

  - Use exception_handlers instead of gs base to pass table to the guest.
  - Move unexpected vector assert to processor.c.

Aaron Lewis (4):
  selftests: kvm: Fix the segment descriptor layout to match the actual
    layout
  selftests: kvm: Clear uc so UCALL_NONE is being properly reported
  selftests: kvm: Add exception handling to selftests
  selftests: kvm: Test MSR exiting to userspace

 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |  20 +-
 .../selftests/kvm/include/x86_64/processor.h  |  27 +-
 .../testing/selftests/kvm/lib/aarch64/ucall.c |   3 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |   7 +
 .../selftests/kvm/lib/kvm_util_internal.h     |   2 +
 tools/testing/selftests/kvm/lib/s390x/ucall.c |   3 +
 .../selftests/kvm/lib/x86_64/handlers.S       |  81 +++
 .../selftests/kvm/lib/x86_64/processor.c      | 117 +++-
 .../testing/selftests/kvm/lib/x86_64/ucall.c  |   3 +
 .../kvm/x86_64/userspace_msr_exit_test.c      | 547 ++++++++++++++++++
 11 files changed, 800 insertions(+), 11 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/lib/x86_64/handlers.S
 create mode 100644 tools/testing/selftests/kvm/x86_64/userspace_msr_exit_test.c