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[PATCH 22/33] migration: push Error **errp into qemu_savevm_state_iterat
From: |
Daniel P . Berrangé |
Subject: |
[PATCH 22/33] migration: push Error **errp into qemu_savevm_state_iterate() |
Date: |
Thu, 4 Feb 2021 17:18:56 +0000 |
This is an incremental step in converting vmstate loading code to report
via Error objects instead of printing directly to the console/monitor.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
migration/migration.c | 8 +++++++-
migration/savevm.c | 47 ++++++++++++++++++++++++++-----------------
migration/savevm.h | 2 +-
3 files changed, 37 insertions(+), 20 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 395a1b10f5..a85d101ad8 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -3393,6 +3393,8 @@ static MigIterateState
migration_iteration_run(MigrationState *s)
pend_pre, pend_compat, pend_post);
if (pending_size && pending_size >= s->threshold_size) {
+ int ret;
+ Error *local_err = NULL;
/* Still a significant amount to transfer */
if (!in_postcopy && pend_pre <= s->threshold_size &&
qatomic_read(&s->start_postcopy)) {
@@ -3402,7 +3404,11 @@ static MigIterateState
migration_iteration_run(MigrationState *s)
return MIG_ITERATE_SKIP;
}
/* Just another iteration step */
- qemu_savevm_state_iterate(s->to_dst_file, in_postcopy);
+ ret = qemu_savevm_state_iterate(s->to_dst_file, in_postcopy,
+ &local_err);
+ if (ret < 0) {
+ error_report_err(local_err);
+ }
} else {
trace_migration_thread_low_pending(pending_size);
migration_completion(s);
diff --git a/migration/savevm.c b/migration/savevm.c
index 6a7b930b1c..23e4d5a1a2 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1220,8 +1220,9 @@ int qemu_savevm_state_resume_prepare(MigrationState *s)
* negative: there was one error, and we have -errno.
* 0 : We haven't finished, caller have to go again
* 1 : We have finished, we can go to complete phase
+ * -1 : error reported, go to cleanup phase
*/
-int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy)
+int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy, Error **errp)
{
SaveStateEntry *se;
int ret = 1;
@@ -1261,11 +1262,13 @@ int qemu_savevm_state_iterate(QEMUFile *f, bool
postcopy)
save_section_footer(f, se);
if (ret < 0) {
- error_report("failed to save SaveStateEntry with id(name): %d(%s)",
- se->section_id, se->idstr);
+ error_setg(errp,
+ "failed to save SaveStateEntry with id(name): %d(%s)",
+ se->section_id, se->idstr);
qemu_file_set_error(f, ret);
+ return -1;
}
- if (ret <= 0) {
+ if (ret == 0) {
/* Do not proceed to the next vmstate before this one reported
completion of the current stage. This serializes the migration
and reduces the probability that a faster changing state is
@@ -1517,7 +1520,6 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
{
int ret;
MigrationState *ms = migrate_get_current();
- MigrationStatus status;
if (migration_is_running(ms->state)) {
error_setg(errp, QERR_MIGRATION_ACTIVE);
@@ -1538,34 +1540,43 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
qemu_savevm_state_setup(f);
qemu_mutex_lock_iothread();
- while (qemu_file_get_error(f) == 0) {
- if (qemu_savevm_state_iterate(f, false) > 0) {
+ while (1) {
+ ret = qemu_savevm_state_iterate(f, false, errp);
+ if (ret < 0) {
+ goto fail;
+ }
+ if (ret > 0) {
break;
}
+ ret = qemu_file_get_error(f);
+ if (ret != 0) {
+ error_setg_errno(errp, -ret, "Error while writing VM state");
+ goto fail;
+ }
}
+ qemu_savevm_state_complete_precopy(f, false, false);
ret = qemu_file_get_error(f);
- if (ret == 0) {
- 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");
+ goto fail;
}
- if (ret != 0) {
- status = MIGRATION_STATUS_FAILED;
- } else {
- status = MIGRATION_STATUS_COMPLETED;
- }
- migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP, status);
+ qemu_savevm_state_cleanup();
+ migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP,
+ MIGRATION_STATUS_COMPLETED);
/* f is outer parameter, it should not stay in global migration state after
* this function finished */
ms->to_dst_file = NULL;
return ret;
+
+ fail:
+ qemu_savevm_state_cleanup();
+ migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP,
+ MIGRATION_STATUS_FAILED);
+ return -1;
}
void qemu_savevm_live_state(QEMUFile *f)
diff --git a/migration/savevm.h b/migration/savevm.h
index 1cec83c729..e187640806 100644
--- a/migration/savevm.h
+++ b/migration/savevm.h
@@ -34,7 +34,7 @@ void qemu_savevm_state_setup(QEMUFile *f);
bool qemu_savevm_state_guest_unplug_pending(void);
int qemu_savevm_state_resume_prepare(MigrationState *s);
void qemu_savevm_state_header(QEMUFile *f);
-int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy);
+int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy, Error **errp);
void qemu_savevm_state_cleanup(void);
void qemu_savevm_state_complete_postcopy(QEMUFile *f);
int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only,
--
2.29.2
- Re: [PATCH 14/33] migration: push Error **errp into loadvm_postcopy_ram_handle_discard(), (continued)
- [PATCH 16/33] migration: push Error **errp into loadvm_handle_recv_bitmap(), Daniel P . Berrangé, 2021/02/04
- [PATCH 17/33] migration: push Error **errp into loadvm_process_enable_colo(), Daniel P . Berrangé, 2021/02/04
- [PATCH 18/33] migration: push Error **errp into colo_init_ram_cache(), Daniel P . Berrangé, 2021/02/04
- [PATCH 23/33] migration: simplify some error reporting in save_snapshot(), Daniel P . Berrangé, 2021/02/04
- [PATCH 19/33] migration: push Error **errp into check_section_footer(), Daniel P . Berrangé, 2021/02/04
- [PATCH 21/33] migration: remove error reporting from qemu_fopen_bdrv() callers, Daniel P . Berrangé, 2021/02/04
- [PATCH 20/33] migration: push Error **errp into global_state_store(), Daniel P . Berrangé, 2021/02/04
- [PATCH 25/33] migration: push Error **errp into qemu_savevm_state_complete_precopy(), Daniel P . Berrangé, 2021/02/04
- [PATCH 22/33] migration: push Error **errp into qemu_savevm_state_iterate(),
Daniel P . Berrangé <=
- [PATCH 28/33] migration: push Error **errp into qemu_savevm_send_packaged(), Daniel P . Berrangé, 2021/02/04
- [PATCH 31/33] migration: push Error **errp into qemu_savevm_state_resume_prepare(), Daniel P . Berrangé, 2021/02/04
- [PATCH 26/33] migration: push Error **errp into qemu_savevm_state_complete_precopy_non_iterable(), Daniel P . Berrangé, 2021/02/04
- [PATCH 32/33] migration: push Error **errp into postcopy_resume_handshake(), Daniel P . Berrangé, 2021/02/04
- [PATCH 27/33] migration: push Error **errp into qemu_savevm_state_complete_precopy(), Daniel P . Berrangé, 2021/02/04
- [PATCH 24/33] migration: push Error **errp into qemu_savevm_state_setup(), Daniel P . Berrangé, 2021/02/04
- [PATCH 29/33] migration: push Error **errp into qemu_savevm_live_state(), Daniel P . Berrangé, 2021/02/04
- [PATCH 30/33] migration: push Error **errp into qemu_save_device_state(), Daniel P . Berrangé, 2021/02/04
- [PATCH 33/33] migration: push Error **errp into postcopy_do_resume(), Daniel P . Berrangé, 2021/02/04
- Re: [PATCH 00/33] migration: capture error reports into Error object, Dr. David Alan Gilbert, 2021/02/04