Merge tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull for 9.1

- Het's new test cases for "channels"
- Het's fix for a typo for vsock parsing
- Cedric's VFIO error report series
- Cedric's one more patch for dirty-bitmap error reports
- Zhijian's rdma deprecation patch
- Yuan's zeropage optimization to fix double faults on anon mem
- Zhijian's COLO fix on a crash

# -----BEGIN PGP SIGNATURE-----
#
# iIgEABYKADAWIQS5GE3CDMRX2s990ak7X8zN86vXBgUCZig4HxIccGV0ZXJ4QHJl
# ZGhhdC5jb20ACgkQO1/MzfOr1wbQiwD/V5nSJzSuAG4Ra1Fjo+LRG2TT6qk8eNCi
# fIytehSw6cYA/0wqarxOF0tr7ikeyhtG3w4xFf44kk6KcPkoVSl1tqoL
# =pJmQ
# -----END PGP SIGNATURE-----
# gpg: Signature made Tue 23 Apr 2024 03:37:19 PM PDT
# gpg:                using EDDSA key B9184DC20CC457DACF7DD1A93B5FCCCDF3ABD706
# gpg:                issuer "peterx@redhat.com"
# gpg: Good signature from "Peter Xu <xzpeter@gmail.com>" [unknown]
# gpg:                 aka "Peter Xu <peterx@redhat.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: B918 4DC2 0CC4 57DA CF7D  D1A9 3B5F CCCD F3AB D706

* tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu: (26 commits)
  migration/colo: Fix bdrv_graph_rdlock_main_loop: Assertion `!qemu_in_coroutine()' failed.
  migration/multifd: solve zero page causing multiple page faults
  migration: Add Error** argument to add_bitmaps_to_list()
  migration: Modify ram_init_bitmaps() to report dirty tracking errors
  migration: Add Error** argument to xbzrle_init()
  migration: Add Error** argument to ram_state_init()
  memory: Add Error** argument to the global_dirty_log routines
  migration: Introduce ram_bitmaps_destroy()
  memory: Add Error** argument to .log_global_start() handler
  migration: Add Error** argument to .load_setup() handler
  migration: Add Error** argument to .save_setup() handler
  migration: Add Error** argument to qemu_savevm_state_setup()
  migration: Add Error** argument to vmstate_save()
  migration: Always report an error in ram_save_setup()
  migration: Always report an error in block_save_setup()
  vfio: Always report an error in vfio_save_setup()
  s390/stattrib: Add Error** argument to set_migrationmode() handler
  tests/qtest/migration: Fix typo for vsock in SocketAddress_to_str
  tests/qtest/migration: Add negative tests to validate migration QAPIs
  tests/qtest/migration: Add multifd_tcp_plain test using list of channels instead of uri
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 34 insertions, 23 deletions

diff --git a/migration/savevm.c b/migration/savevm.c
index e7c1215671..5d200cf42a 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1009,11 +1009,10 @@ static void save_section_footer(QEMUFile *f, SaveStateEntry *se)
     }
 }
 
-static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
+static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc,
+                        Error **errp)
 {
     int ret;
-    Error *local_err = NULL;
-    MigrationState *s = migrate_get_current();
 
     if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
         return 0;
@@ -1035,10 +1034,9 @@ static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
     if (!se->vmsd) {
         vmstate_save_old_style(f, se, vmdesc);
     } else {
-        ret = vmstate_save_state_with_err(f, se->vmsd, se->opaque, vmdesc, &local_err);
+        ret = vmstate_save_state_with_err(f, se->vmsd, se->opaque, vmdesc,
+                                          errp);
         if (ret) {
-            migrate_set_error(s, local_err);
-            error_report_err(local_err);
             return ret;
         }
     }
@@ -1312,11 +1310,11 @@ int qemu_savevm_state_prepare(Error **errp)
     return 0;
 }
 
-void qemu_savevm_state_setup(QEMUFile *f)
+int qemu_savevm_state_setup(QEMUFile *f, Error **errp)
 {
+    ERRP_GUARD();
     MigrationState *ms = migrate_get_current();
     SaveStateEntry *se;
-    Error *local_err = NULL;
     int ret = 0;
 
     json_writer_int64(ms->vmdesc, "page_size", qemu_target_page_size());
@@ -1325,8 +1323,9 @@ void qemu_savevm_state_setup(QEMUFile *f)
     trace_savevm_state_setup();
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         if (se->vmsd && se->vmsd->early_setup) {
-            ret = vmstate_save(f, se, ms->vmdesc);
+            ret = vmstate_save(f, se, ms->vmdesc, errp);
             if (ret) {
+                migrate_set_error(ms, *errp);
                 qemu_file_set_error(f, ret);
                 break;
             }
@@ -1343,7 +1342,7 @@ void qemu_savevm_state_setup(QEMUFile *f)
         }
         save_section_header(f, se, QEMU_VM_SECTION_START);
 
-        ret = se->ops->save_setup(f, se->opaque);
+        ret = se->ops->save_setup(f, se->opaque, errp);
         save_section_footer(f, se);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
@@ -1352,12 +1351,11 @@ void qemu_savevm_state_setup(QEMUFile *f)
     }
 
     if (ret) {
-        return;
+        return ret;
     }
 
-    if (precopy_notify(PRECOPY_NOTIFY_SETUP, &local_err)) {
-        error_report_err(local_err);
-    }
+    /* TODO: Should we check that errp is set in case of failure ? */
+    return precopy_notify(PRECOPY_NOTIFY_SETUP, errp);
 }
 
 int qemu_savevm_state_resume_prepare(MigrationState *s)
@@ -1542,6 +1540,7 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
     JSONWriter *vmdesc = ms->vmdesc;
     int vmdesc_len;
     SaveStateEntry *se;
+    Error *local_err = NULL;
     int ret;
 
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
@@ -1552,8 +1551,10 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
 
         start_ts_each = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
 
-        ret = vmstate_save(f, se, vmdesc);
+        ret = vmstate_save(f, se, vmdesc, &local_err);
         if (ret) {
+            migrate_set_error(ms, local_err);
+            error_report_err(local_err);
             qemu_file_set_error(f, ret);
             return ret;
         }
@@ -1568,7 +1569,6 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
          * bdrv_activate_all() on the other end won't fail. */
         ret = bdrv_inactivate_all();
         if (ret) {
-            Error *local_err = NULL;
             error_setg(&local_err, "%s: bdrv_inactivate_all() failed (%d)",
                        __func__, ret);
             migrate_set_error(ms, local_err);
@@ -1723,7 +1723,10 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
     ms->to_dst_file = f;
 
     qemu_savevm_state_header(f);
-    qemu_savevm_state_setup(f);
+    ret = qemu_savevm_state_setup(f, errp);
+    if (ret) {
+        goto cleanup;
+    }
 
     while (qemu_file_get_error(f) == 0) {
         if (qemu_savevm_state_iterate(f, false) > 0) {
@@ -1736,10 +1739,11 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
         qemu_savevm_state_complete_precopy(f, false, false);
         ret = qemu_file_get_error(f);
     }
-    qemu_savevm_state_cleanup();
     if (ret != 0) {
         error_setg_errno(errp, -ret, "Error while writing VM state");
     }
+cleanup:
+    qemu_savevm_state_cleanup();
 
     if (ret != 0) {
         status = MIGRATION_STATUS_FAILED;
@@ -1764,6 +1768,8 @@ void qemu_savevm_live_state(QEMUFile *f)
 
 int qemu_save_device_state(QEMUFile *f)
 {
+    MigrationState *ms = migrate_get_current();
+    Error *local_err = NULL;
     SaveStateEntry *se;
 
     if (!migration_in_colo_state()) {
@@ -1778,8 +1784,10 @@ int qemu_save_device_state(QEMUFile *f)
         if (se->is_ram) {
             continue;
         }
-        ret = vmstate_save(f, se, NULL);
+        ret = vmstate_save(f, se, NULL, &local_err);
         if (ret) {
+            migrate_set_error(ms, local_err);
+            error_report_err(local_err);
             return ret;
         }
     }
@@ -2760,8 +2768,9 @@ static void qemu_loadvm_state_switchover_ack_needed(MigrationIncomingState *mis)
     trace_loadvm_state_switchover_ack_needed(mis->switchover_ack_pending_num);
 }
 
-static int qemu_loadvm_state_setup(QEMUFile *f)
+static int qemu_loadvm_state_setup(QEMUFile *f, Error **errp)
 {
+    ERRP_GUARD();
     SaveStateEntry *se;
     int ret;
 
@@ -2776,10 +2785,11 @@ static int qemu_loadvm_state_setup(QEMUFile *f)
             }
         }
 
-        ret = se->ops->load_setup(f, se->opaque);
+        ret = se->ops->load_setup(f, se->opaque, errp);
         if (ret < 0) {
+            error_prepend(errp, "Load state of device %s failed: ",
+                          se->idstr);
             qemu_file_set_error(f, ret);
-            error_report("Load state of device %s failed", se->idstr);
             return ret;
         }
     }
@@ -2960,7 +2970,8 @@ int qemu_loadvm_state(QEMUFile *f)
         return ret;
     }
 
-    if (qemu_loadvm_state_setup(f) != 0) {
+    if (qemu_loadvm_state_setup(f, &local_err) != 0) {
+        error_report_err(local_err);
         return -EINVAL;
     }