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migration: Update error description whenever migration fails 

There are places in migration.c where the migration is marked failed with
MIGRATION_STATUS_FAILED, but the failure reason is never updated. Hence
libvirt doesn't know why the migration failed when it queries for it.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Tejus GK <tejus.gk@nutanix.com>
Message-ID: <20230621130940.178659-2-tejus.gk@nutanix.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
master
Tejus GK 2023-06-21 13:09:39 +00:00 committed by Juan Quintela
parent f014880ab9
commit 908927db28
1 changed files with 12 additions and 7 deletions
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19
migration/migration.c
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@ -1689,7 +1689,7 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
if (!resume_requested) {
yank_unregister_instance(MIGRATION_YANK_INSTANCE);
}
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, "uri",
"a valid migration protocol");
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
MIGRATION_STATUS_FAILED);
@ -2082,7 +2082,7 @@ migration_wait_main_channel(MigrationState *ms)
* Switch from normal iteration to postcopy
* Returns non-0 on error
*/
static int postcopy_start(MigrationState *ms)
static int postcopy_start(MigrationState *ms, Error **errp)
{
int ret;
QIOChannelBuffer *bioc;
@ -2192,7 +2192,7 @@ static int postcopy_start(MigrationState *ms)
*/
ret = qemu_file_get_error(ms->to_dst_file);
if (ret) {
error_report("postcopy_start: Migration stream errored (pre package)");
error_setg(errp, "postcopy_start: Migration stream errored (pre package)");
goto fail_closefb;
}
@ -2229,7 +2229,7 @@ static int postcopy_start(MigrationState *ms)
ret = qemu_file_get_error(ms->to_dst_file);
if (ret) {
error_report("postcopy_start: Migration stream errored");
error_setg(errp, "postcopy_start: Migration stream errored");
migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
MIGRATION_STATUS_FAILED);
}
@ -2750,6 +2750,7 @@ typedef enum {
static MigIterateState migration_iteration_run(MigrationState *s)
{
uint64_t must_precopy, can_postcopy;
Error *local_err = NULL;
bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE;
bool can_switchover = migration_can_switchover(s);
@ -2773,8 +2774,9 @@ static MigIterateState migration_iteration_run(MigrationState *s)
/* Still a significant amount to transfer */
if (!in_postcopy && must_precopy <= s->threshold_size && can_switchover &&
qatomic_read(&s->start_postcopy)) {
if (postcopy_start(s)) {
error_report("%s: postcopy failed to start", __func__);
if (postcopy_start(s, &local_err)) {
migrate_set_error(s, local_err);
error_report_err(local_err);
}
return MIG_ITERATE_SKIP;
}
@ -3265,8 +3267,10 @@ void migrate_fd_connect(MigrationState *s, Error *error_in)
*/
if (migrate_postcopy_ram() || migrate_return_path()) {
if (open_return_path_on_source(s, !resume)) {
error_report("Unable to open return-path for postcopy");
error_setg(&local_err, "Unable to open return-path for postcopy");
migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED);
migrate_set_error(s, local_err);
error_report_err(local_err);
migrate_fd_cleanup(s);
return;
}
@ -3290,6 +3294,7 @@ void migrate_fd_connect(MigrationState *s, Error *error_in)
}
if (multifd_save_setup(&local_err) != 0) {
migrate_set_error(s, local_err);
error_report_err(local_err);
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
MIGRATION_STATUS_FAILED);