diff --git a/tools/testing/selftests/kvm/access_tracking_perf_test.c b/tools/testing/selftests/kvm/access_tracking_perf_test.c
index 1c2749b1481a..76c583a07ea2 100644
--- a/tools/testing/selftests/kvm/access_tracking_perf_test.c
+++ b/tools/testing/selftests/kvm/access_tracking_perf_test.c
@@ -31,8 +31,9 @@
  * These limitations are worked around in this test by using a large enough
  * region of memory for each vCPU such that the number of translations cached in
  * the TLB and the number of pages held in pagevecs are a small fraction of the
- * overall workload. And if either of those conditions are not true this test
- * will fail rather than silently passing.
+ * overall workload. And if either of those conditions are not true (for example
+ * in nesting, where TLB size is unlimited) this test will print a warning
+ * rather than silently passing.
  */
 #include <inttypes.h>
 #include <limits.h>
@@ -172,17 +173,23 @@ static void mark_vcpu_memory_idle(struct kvm_vm *vm,
 		    vcpu_idx, no_pfn, pages);
 
 	/*
-	 * Test that at least 90% of memory has been marked idle (the rest might
-	 * not be marked idle because the pages have not yet made it to an LRU
-	 * list or the translations are still cached in the TLB). 90% is
+	 * Check that at least 90% of memory has been marked idle (the rest
+	 * might not be marked idle because the pages have not yet made it to an
+	 * LRU list or the translations are still cached in the TLB). 90% is
 	 * arbitrary; high enough that we ensure most memory access went through
 	 * access tracking but low enough as to not make the test too brittle
 	 * over time and across architectures.
+	 *
+	 * Note that when run in nested virtualization, this check will trigger
+	 * much more frequently because TLB size is unlimited and since no flush
+	 * happens, much more pages are cached there and guest won't see the
+	 * "idle" bit cleared.
 	 */
-	TEST_ASSERT(still_idle < pages / 10,
-		    "vCPU%d: Too many pages still idle (%"PRIu64 " out of %"
-		    PRIu64 ").\n",
-		    vcpu_idx, still_idle, pages);
+	if (still_idle < pages / 10)
+		printf("WARNING: vCPU%d: Too many pages still idle (%" PRIu64
+		       "out of %" PRIu64 "), this will affect performance results"
+		       ".\n",
+		       vcpu_idx, still_idle, pages);
 
 	close(page_idle_fd);
 	close(pagemap_fd);