Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20180309a' into staging

Migration pull 2018-03-09

# gpg: Signature made Fri 09 Mar 2018 17:52:46 GMT
# gpg:                using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20180309a:
  tests: Silence migration-test 'bad' test
  migration: fix applying wrong capabilities
  migration/block: rename MAX_INFLIGHT_IO to MAX_IO_BUFFERS
  migration/block: reset dirty bitmap before read in bulk phase
  migration: do not transfer ram during bulk storage migration
  migration: fix minor finalize leak

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 31 insertions, 11 deletions

diff --git a/migration/block.c b/migration/block.c
index 1f03946797..41b95d1dd8 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -36,7 +36,7 @@
 
 #define MAX_IS_ALLOCATED_SEARCH (65536 * BDRV_SECTOR_SIZE)
 
-#define MAX_INFLIGHT_IO 512
+#define MAX_IO_BUFFERS 512
 
 //#define DEBUG_BLK_MIGRATION
 
@@ -331,11 +331,10 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
      */
     qemu_mutex_lock_iothread();
     aio_context_acquire(blk_get_aio_context(bmds->blk));
-    blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
-                                0, blk_mig_read_cb, blk);
-
     bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
                             nr_sectors * BDRV_SECTOR_SIZE);
+    blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
+                                0, blk_mig_read_cb, blk);
     aio_context_release(blk_get_aio_context(bmds->blk));
     qemu_mutex_unlock_iothread();
 
@@ -776,9 +775,8 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
     while ((block_mig_state.submitted +
             block_mig_state.read_done) * BLOCK_SIZE <
            qemu_file_get_rate_limit(f) &&
-           (block_mig_state.submitted +
-            block_mig_state.read_done) <
-           MAX_INFLIGHT_IO) {
+           (block_mig_state.submitted + block_mig_state.read_done) <
+           MAX_IO_BUFFERS) {
         blk_mig_unlock();
         if (block_mig_state.bulk_completed == 0) {
             /* first finish the bulk phase */
diff --git a/migration/migration.c b/migration/migration.c
index e345d0cc7e..6a4780ef6f 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -747,13 +747,15 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
 {
     MigrationState *s = migrate_get_current();
     MigrationCapabilityStatusList *cap;
+    bool cap_list[MIGRATION_CAPABILITY__MAX];
 
     if (migration_is_setup_or_active(s->state)) {
         error_setg(errp, QERR_MIGRATION_ACTIVE);
         return;
     }
 
-    if (!migrate_caps_check(s->enabled_capabilities, params, errp)) {
+    memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list));
+    if (!migrate_caps_check(cap_list, params, errp)) {
         return;
     }
 
@@ -2541,6 +2543,7 @@ static void migration_instance_finalize(Object *obj)
     g_free(params->tls_hostname);
     g_free(params->tls_creds);
     qemu_sem_destroy(&ms->pause_sem);
+    error_free(ms->error);
 }
 
 static void migration_instance_init(Object *obj)
diff --git a/migration/ram.c b/migration/ram.c
index 3b6c077964..7266351fd0 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2258,6 +2258,13 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
     int64_t t0;
     int done = 0;
 
+    if (blk_mig_bulk_active()) {
+        /* Avoid transferring ram during bulk phase of block migration as
+         * the bulk phase will usually take a long time and transferring
+         * ram updates during that time is pointless. */
+        goto out;
+    }
+
     rcu_read_lock();
     if (ram_list.version != rs->last_version) {
         ram_state_reset(rs);
@@ -2304,6 +2311,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
      */
     ram_control_after_iterate(f, RAM_CONTROL_ROUND);
 
+out:
     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
     ram_counters.transferred += 8;
 
diff --git a/tests/migration-test.c b/tests/migration-test.c
index 74f9361bdd..422bf1afdf 100644
--- a/tests/migration-test.c
+++ b/tests/migration-test.c
@@ -382,7 +382,7 @@ static void migrate_start_postcopy(QTestState *who)
 }
 
 static void test_migrate_start(QTestState **from, QTestState **to,
-                               const char *uri)
+                               const char *uri, bool hide_stderr)
 {
     gchar *cmd_src, *cmd_dst;
     char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
@@ -427,6 +427,17 @@ static void test_migrate_start(QTestState **from, QTestState **to,
 
     g_free(bootpath);
 
+    if (hide_stderr) {
+        gchar *tmp;
+        tmp = g_strdup_printf("%s 2>/dev/null", cmd_src);
+        g_free(cmd_src);
+        cmd_src = tmp;
+
+        tmp = g_strdup_printf("%s 2>/dev/null", cmd_dst);
+        g_free(cmd_dst);
+        cmd_dst = tmp;
+    }
+
     *from = qtest_start(cmd_src);
     g_free(cmd_src);
 
@@ -518,7 +529,7 @@ static void test_migrate(void)
     char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
     QTestState *from, *to;
 
-    test_migrate_start(&from, &to, uri);
+    test_migrate_start(&from, &to, uri, false);
 
     migrate_set_capability(from, "postcopy-ram", "true");
     migrate_set_capability(to, "postcopy-ram", "true");
@@ -560,7 +571,7 @@ static void test_baddest(void)
     const char *status;
     bool failed;
 
-    test_migrate_start(&from, &to, "tcp:0:0");
+    test_migrate_start(&from, &to, "tcp:0:0", true);
     migrate(from, "tcp:0:0");
     do {
         rsp = wait_command(from, "{ 'execute': 'query-migrate' }");