[PATCH v5 13/13] migration/multifd: Add integration tests for multifd with Intel DSA offloading.

[Yichen Wang]

From: Hao Xiang <hao.xiang@linux.dev>

* Add test case to start and complete multifd live migration with DSA
offloading enabled.
* Add test case to start and cancel multifd live migration with DSA
offloading enabled.

Signed-off-by: Bryan Zhang <bryan.zhang@bytedance.com>
Signed-off-by: Hao Xiang <hao.xiang@linux.dev>
Signed-off-by: Yichen Wang <yichen.wang@bytedance.com>
---
 tests/qtest/migration-test.c | 80 +++++++++++++++++++++++++++++++++++-
 1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 70b606b888..67cd976705 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -608,6 +608,13 @@ typedef struct {
     bool suspend_me;
 } MigrateStart;
 
+/*
+ * It requires separate steps to configure and enable DSA device.
+ * This test assumes that the configuration is done already.
+ */
+static const char *dsa_dev_path_p = "['/dev/dsa/wq4.0']";
+static const char *dsa_dev_path = "/dev/dsa/wq4.0";
+
 /*
  * A hook that runs after the src and dst QEMUs have been
  * created, but before the migration is started. This can
@@ -3279,7 +3286,7 @@ static void 
test_multifd_tcp_tls_x509_reject_anon_client(void)
  *
  *  And see that it works
  */
-static void test_multifd_tcp_cancel(void)
+static void test_multifd_tcp_cancel_common(bool use_dsa)
 {
     MigrateStart args = {
         .hide_stderr = true,
@@ -3299,6 +3306,11 @@ static void test_multifd_tcp_cancel(void)
     migrate_set_capability(from, "multifd", true);
     migrate_set_capability(to, "multifd", true);
 
+    if (use_dsa) {
+        migrate_set_parameter_str(from, "zero-page-detection", "dsa-accel");
+        migrate_set_parameter_str(from, "dsa-accel-path", dsa_dev_path_p);
+    }
+
     /* Start incoming migration from the 1st socket */
     migrate_incoming_qmp(to, "tcp:127.0.0.1:0", "{}");
 
@@ -3348,6 +3360,49 @@ static void test_multifd_tcp_cancel(void)
     test_migrate_end(from, to2, true);
 }
 
+/*
+ * This test does:
+ *  source               target
+ *                       migrate_incoming
+ *     migrate
+ *     migrate_cancel
+ *                       launch another target
+ *     migrate
+ *
+ *  And see that it works
+ */
+static void test_multifd_tcp_cancel(void)
+{
+    test_multifd_tcp_cancel_common(false);
+}
+
+#ifdef CONFIG_DSA_OPT
+
+static void *test_migrate_precopy_tcp_multifd_start_dsa(QTestState *from,
+                                                        QTestState *to)
+{
+    migrate_set_parameter_str(from, "zero-page-detection", "dsa-accel");
+    migrate_set_parameter_str(from, "dsa-accel-path", dsa_dev_path_p);
+    return test_migrate_precopy_tcp_multifd_start_common(from, to, "none");
+}
+
+static void test_multifd_tcp_zero_page_dsa(void)
+{
+    MigrateCommon args = {
+        .listen_uri = "defer",
+        .start_hook = test_migrate_precopy_tcp_multifd_start_dsa,
+    };
+
+    test_precopy_common(&args);
+}
+
+static void test_multifd_tcp_cancel_dsa(void)
+{
+    test_multifd_tcp_cancel_common(true);
+}
+
+#endif
+
 static void calc_dirty_rate(QTestState *who, uint64_t calc_time)
 {
     qtest_qmp_assert_success(who,
@@ -3772,6 +3827,19 @@ static bool kvm_dirty_ring_supported(void)
 #endif
 }
 
+#ifdef CONFIG_DSA_OPT
+static int test_dsa_setup(void)
+{
+    int fd;
+    fd = open(dsa_dev_path, O_RDWR);
+    if (fd < 0) {
+        return -1;
+    }
+    close(fd);
+    return 0;
+}
+#endif
+
 int main(int argc, char **argv)
 {
     bool has_kvm, has_tcg;
@@ -3984,6 +4052,16 @@ int main(int argc, char **argv)
                        test_multifd_tcp_zero_page_legacy);
     migration_test_add("/migration/multifd/tcp/plain/zero-page/none",
                        test_multifd_tcp_no_zero_page);
+
+#ifdef CONFIG_DSA_OPT
+    if (g_str_equal(arch, "x86_64") && test_dsa_setup() == 0) {
+        migration_test_add("/migration/multifd/tcp/plain/zero-page/dsa",
+                       test_multifd_tcp_zero_page_dsa);
+        migration_test_add("/migration/multifd/tcp/plain/cancel/dsa",
+                       test_multifd_tcp_cancel_dsa);
+    }
+#endif
+
     migration_test_add("/migration/multifd/tcp/plain/cancel",
                        test_multifd_tcp_cancel);
     migration_test_add("/migration/multifd/tcp/plain/zlib",
-- 
Yichen Wang