Re: [PATCH V3 0/2] selftests/powerpc: Updates to EBB selftest for ISA v3.1

On 25-May-2021, at 7:21 PM, Athira Rajeev [off-list ref] wrote:

The "no_handler_test" in ebb selftests attempts to read the PMU
registers after closing of the event via helper function
"dump_ebb_state". With the MMCR0 control bit (PMCCEXT) in ISA v3.1,
read access to group B registers is restricted when MMCR0 PMCC=0b00.
Hence the call to dump_ebb_state after closing of event will generate
a SIGILL, which is expected.

Test has below in logs:
<<>>
!! child died by signal 4
failure: no_handler_test
<<>>

Tested patches on Power9 and Power10 - PowerVM environment.

Power9 - no_handler_test - with and without patch - success
Power10 - no_handler_test - without patch - failure
Power10 - no_handler_test - with patch - success

Power9 - regs_access_pmccext_test - with patch - success
Power10 - regs_access_pmccext_test - with patch - success

Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com <mailto:rnsastry@linux.ibm.com>>

Thank you.