<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 25-May-2021, at 7:21 PM, Athira Rajeev <<a href="mailto:atrajeev@linux.vnet.ibm.com" class="">atrajeev@linux.vnet.ibm.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">The "no_handler_test" in ebb selftests attempts to read the PMU<br class="">registers after closing of the event via helper function<br class="">"dump_ebb_state". With the MMCR0 control bit (PMCCEXT) in ISA v3.1,<br class="">read access to group B registers is restricted when MMCR0 PMCC=0b00.<br class="">Hence the call to dump_ebb_state after closing of event will generate<br class="">a SIGILL, which is expected.<br class=""><br class="">Test has below in logs:<br class=""><<>><br class="">!! child died by signal 4<br class="">failure: no_handler_test<br class=""><<>><br class=""><br class=""></div></div></blockquote></div>Tested patches on Power9 and Power10 - PowerVM environment.<div class=""><br class=""></div><div class="">Power9 - no_handler_test - with and without patch - success</div><div class="">Power10 - no_handler_test - without patch - failure</div><div class="">Power10 - no_handler_test - with patch - success</div><div class=""><div class=""><br class=""></div><div class="">Power9 - regs_access_pmccext_test - with patch - success</div><div class="">Power10 - regs_access_pmccext_test - with patch - success</div></div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span style="font-kerning: none" class="">Tested-by: Nageswara R Sastry <<a href="mailto:rnsastry@linux.ibm.com" class=""><span style="-webkit-font-kerning: none; color: rgb(9, 79, 209);" class="">rnsastry@linux.ibm.com</span></a>></span></div></div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span style="font-kerning: none" class=""><br class=""></span></div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span style="font-kerning: none" class="">Thank you.</span></div></body></html>