On Fri Aug 23, 2024 at 3:05 PM CEST, Hariharan Mari wrote:
Introduce new regression tests to verify the ASM inline block in the SORTL and DFLTCC CPU subfunctions for the s390x architecture. These tests ensure that future changes to the ASM code are properly validated.
The test procedure:
- Create a VM and request the KVM_S390_VM_CPU_MACHINE_SUBFUNC attribute from the KVM_S390_VM_CPU_MODEL group for this VM. This SUBFUNC attribute contains the results of all CPU subfunction instructions.
- For each tested subfunction (SORTL and DFLTCC), execute the corresponding ASM instruction and capture the result array.
- Perform a memory comparison between the results stored in the SUBFUNC attribute (obtained in step 1) and the ASM instruction results (obtained in step 2) for each tested subfunction.
This process ensures that the KVM implementation accurately reflects the behavior of the actual CPU instructions for the tested subfunctions.
Suggested-by: Janosch Frank frankja@linux.ibm.com Signed-off-by: Hariharan Mari hari55@linux.ibm.com Reviewed-by: Janosch Frank frankja@linux.ibm.com
LGTM
Reviewed-by: Christoph Schlameuss schlameuss@linux.ibm.com
tools/testing/selftests/kvm/Makefile | 2 + .../selftests/kvm/include/s390x/facility.h | 50 +++++++++ .../selftests/kvm/lib/s390x/facility.c | 14 +++ .../kvm/s390x/cpumodel_subfuncs_test.c | 105 ++++++++++++++++++ 4 files changed, 171 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/s390x/facility.h create mode 100644 tools/testing/selftests/kvm/lib/s390x/facility.c create mode 100644 tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c
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