On Tue Aug 20, 2024 at 8:48 AM 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: > > 1. 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. > 2. For each tested subfunction (SORTL and DFLTCC), execute the > corresponding ASM instruction and capture the result array. > 3. 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@xxxxxxxxxxxxx> > Signed-off-by: Hariharan Mari <hari55@xxxxxxxxxxxxx> > Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx> LGTM Reviewed-by: Christoph Schlameuss <schlameuss@xxxxxxxxxxxxx> > --- > tools/testing/selftests/kvm/Makefile | 1 + > .../selftests/kvm/include/s390x/facility.h | 50 ++++++++ > .../kvm/s390x/cpumodel_subfuncs_test.c | 115 ++++++++++++++++++ > 3 files changed, 166 insertions(+) > create mode 100644 tools/testing/selftests/kvm/include/s390x/facility.h > create mode 100644 tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c [...]
