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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jan 2026 02:43:59.8985 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1d5abe67-6d11-4f08-13bb-08de5704997e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV0PR12MB999094 Content-Type: text/plain; charset="utf-8" Older IBS implementations lacked a hardware privilege filter, so the kernel enabled swfilt=3D1. Newer AMD CPUs will provide privilege filtering via the RIP[63] bit, making swfilt redundant. Remove the perf unit test that assumes IBS has no hardware-assisted privilege filter. swfilt is ignored by kernel on platforms that support RIP[63] bit filter i.e. all amd-ibs-swfilt.sh tests will test hardware assisted privilege filter. Without the patch: # ./perf test -vv 75 test child forked, pid 26029 check availability of IBS swfilt run perf record with modifier and swfilt [FAIL] IBS PMU should not accept exclude_kernel 75: AMD IBS software filtering : FAILED! With the patch: # ./perf test -vv 75 check availability of IBS swfilt run perf record with modifier and swfilt [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] check number of samples with swfilt [ perf record: Woken up 5 times to write data ] [ perf record: Captured and wrote 0.040 MB - ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.054 MB - ] 75: AMD IBS software filtering : Ok Signed-off-by: Ravi Bangoria --- tools/perf/tests/shell/amd-ibs-swfilt.sh | 7 ------- 1 file changed, 7 deletions(-) diff --git a/tools/perf/tests/shell/amd-ibs-swfilt.sh b/tools/perf/tests/sh= ell/amd-ibs-swfilt.sh index e7f66df05c4b..92ef45bf3043 100755 --- a/tools/perf/tests/shell/amd-ibs-swfilt.sh +++ b/tools/perf/tests/shell/amd-ibs-swfilt.sh @@ -22,13 +22,6 @@ fi echo "run perf record with modifier and swfilt" err=3D0 =20 -# setting any modifiers should fail -perf record -B -e ibs_op//u -o /dev/null true 2> /dev/null -if [ $? -eq 0 ]; then - echo "[FAIL] IBS PMU should not accept exclude_kernel" - exit 1 -fi - # setting it with swfilt should be fine perf record -B -e ibs_op/swfilt/u -o /dev/null true if [ $? -ne 0 ]; then --=20 2.43.0