[PATCH v2 28/28] KVM: selftests: Disable dirty logging with vCPUs running

[Ben Gardon]

Disabling dirty logging is much more intestesting from a testing
perspective if the vCPUs are still running. This also excercises the
code-path in which collapsible SPTEs must be faulted back in at a higher
level after disabling dirty logging.

To: linux-kselftest@xxxxxxxxxxxxxxx
CC: Peter Xu <peterx@xxxxxxxxxx>
CC: Andrew Jones <drjones@xxxxxxxxxx>
CC: Thomas Huth <thuth@xxxxxxxxxx>
Signed-off-by: Ben Gardon <bgardon@xxxxxxxxxx>
---
 tools/testing/selftests/kvm/dirty_log_perf_test.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c
index 604ccefd6e76..d44a5b8ef232 100644
--- a/tools/testing/selftests/kvm/dirty_log_perf_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c
@@ -205,11 +205,6 @@ static void run_test(enum vm_guest_mode mode, void *arg)
 		}
 	}
 
-	/* Tell the vcpu thread to quit */
-	host_quit = true;
-	for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
-		pthread_join(vcpu_threads[vcpu_id], NULL);
-
 	/* Disable dirty logging */
 	clock_gettime(CLOCK_MONOTONIC, &start);
 	vm_mem_region_set_flags(vm, PERF_TEST_MEM_SLOT_INDEX, 0);
@@ -217,6 +212,11 @@ static void run_test(enum vm_guest_mode mode, void *arg)
 	pr_info("Disabling dirty logging time: %ld.%.9lds\n",
 		ts_diff.tv_sec, ts_diff.tv_nsec);
 
+	/* Tell the vcpu thread to quit */
+	host_quit = true;
+	for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
+		pthread_join(vcpu_threads[vcpu_id], NULL);
+
 	avg = timespec_div(get_dirty_log_total, p->iterations);
 	pr_info("Get dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
 		p->iterations, get_dirty_log_total.tv_sec,
-- 
2.30.0.365.g02bc693789-goog