[PATCH v2] tests/intel/xe_exec_system_allocator: Ignore expected CAT error in fault subtest

[Shuicheng Lin <shuicheng.lin@intel.com>]

The 'fault' subtest submits an exec with a bogus batch address. The
kernel nacks the unresolvable pagefault, which the GuC escalates to a
memory CAT error and engine reset. The resulting 'CAT error' dmesg
messages are expected, not a real failure.

Emit an ignore-dmesg regex to suppress them in CI. It matches both
'Memory CAT error reported by GuC!' and 'Engine memory CAT error'
messages.

v2: Add comment in code & expand dmesg regex. (Kamil)

Cc: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
---
 tests/intel/xe_exec_system_allocator.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tests/intel/xe_exec_system_allocator.c b/tests/intel/xe_exec_system_allocator.c
index 48ae738ec..50cd6ead7 100644
--- a/tests/intel/xe_exec_system_allocator.c
+++ b/tests/intel/xe_exec_system_allocator.c
@@ -2740,10 +2740,16 @@ int igt_main()
 	igt_subtest("threads-shared-alloc-many-stride-malloc-race")
 		threads(fd, 1, 128, 0, 256, RACE | SHARED_ALLOC, false);
 
-	igt_subtest_f("fault")
+	igt_subtest_f("fault") {
+		/*
+		 * Ignore memory CAT error messages in dmesg (both 'Memory CAT error reported by GuC!'
+		 * and 'Engine memory CAT error'), as they are expected when testing page faults.
+		 */
+		igt_emit_ignore_dmesg_regex("[Mm]emory CAT error");
 		xe_for_each_engine(fd, hwe)
 			test_exec(fd, hwe, 4, 1, SZ_2M, 0, 0, NULL, NULL,
 				  FAULT, NULL);
+	}
 
 	for (const struct section *s = psections; s->name; s++) {
 		igt_subtest_f("partial-%s", s->name)
-- 
2.43.0