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

[Nageswara Sastry]

> On 25-May-2021, at 7:21 PM, Athira Rajeev <atrajeev at linux.vnet.ibm.com> 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 at linux.ibm.com <mailto:rnsastry at linux.ibm.com>>

Thank you.
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