This is an incremental step in converting vmstate loading
code to report error via Error objects instead of directly
printing it to console/monitor.
It is ensured that qemu_loadvm_state_main() must report an error
in errp, in case of failure.
loadvm_process_command also sets the errp object explicitly.
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com>
Signed-off-by: Arun Menon <arme...@redhat.com>
---
migration/colo.c | 5 +++--
migration/savevm.c | 33 ++++++++++++++++++++-------------
migration/savevm.h | 3 ++-
3 files changed, 25 insertions(+), 16 deletions(-)
diff --git a/migration/colo.c b/migration/colo.c
index
0ba22ee76a13e313793f653f43a728e3c433bbc1..a96e4dba15516b71d1b315c736c3b4879ff04e58
100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -659,6 +659,7 @@ void migrate_start_colo_process(MigrationState *s)
static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
{
+ ERRP_GUARD();
uint64_t total_size;
uint64_t value;
Error *local_err = NULL;
@@ -686,11 +687,11 @@ static void
colo_incoming_process_checkpoint(MigrationIncomingState *mis,
bql_lock();
cpu_synchronize_all_states();
- ret = qemu_loadvm_state_main(mis->from_src_file, mis);
+ ret = qemu_loadvm_state_main(mis->from_src_file, mis, errp);
bql_unlock();
if (ret < 0) {
- error_setg(errp, "Load VM's live state (ram) error");
+ error_prepend(errp, "Load VM's live state (ram) error: ");
return;
}
diff --git a/migration/savevm.c b/migration/savevm.c
index
f3b91c8ae0eee6078406081f0bd7f686fed28601..ad3dd9b172afc541f104d2187a79bafa8e380466
100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2105,7 +2105,7 @@ static void *postcopy_ram_listen_thread(void *opaque)
qemu_file_set_blocking(f, true);
/* TODO: sanity check that only postcopiable data will be loaded here */
- load_res = qemu_loadvm_state_main(f, mis);
+ load_res = qemu_loadvm_state_main(f, mis, NULL);
/*
* This is tricky, but, mis->from_src_file can change after it
@@ -2407,6 +2407,7 @@ static int
loadvm_postcopy_handle_resume(MigrationIncomingState *mis)
*/
static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis, Error
**errp)
{
+ ERRP_GUARD();
int ret;
size_t length;
QIOChannelBuffer *bioc;
@@ -2456,9 +2457,9 @@ static int
loadvm_handle_cmd_packaged(MigrationIncomingState *mis, Error **errp)
qemu_coroutine_yield();
} while (1);
- ret = qemu_loadvm_state_main(packf, mis);
+ ret = qemu_loadvm_state_main(packf, mis, errp);
if (ret < 0) {
- error_setg(errp, "VM state load failed: %d", ret);
+ error_prepend(errp, "Loading VM state failed: %d: ", ret);
}
trace_loadvm_handle_cmd_packaged_main(ret);
qemu_fclose(packf);
@@ -3074,8 +3075,10 @@ static bool
postcopy_pause_incoming(MigrationIncomingState *mis)
return true;
}
-int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis)
+int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis,
+ Error **errp)
{
+ ERRP_GUARD();
uint8_t section_type;
int ret = 0;
@@ -3083,8 +3086,10 @@ retry:
while (true) {
section_type = qemu_get_byte(f);
- ret = qemu_file_get_error_obj_any(f, mis->postcopy_qemufile_dst, NULL);
+ ret = qemu_file_get_error_obj_any(f, mis->postcopy_qemufile_dst, errp);
if (ret) {
+ error_prepend(errp, "Failed to load device state section ID: %d: ",
+ ret);
break;
}
@@ -3105,7 +3110,7 @@ retry:
}
break;
case QEMU_VM_COMMAND:
- ret = loadvm_process_command(f, NULL);
+ ret = loadvm_process_command(f, errp);
trace_qemu_loadvm_state_section_command(ret);
if ((ret < 0) || (ret == LOADVM_QUIT)) {
goto out;
@@ -3115,7 +3120,7 @@ retry:
/* This is the end of migration */
goto out;
default:
- error_report("Unknown savevm section type %d", section_type);
+ error_setg(errp, "Unknown savevm section type %d", section_type);
ret = -EINVAL;
goto out;
}
@@ -3123,6 +3128,9 @@ retry:
out:
if (ret < 0) {
+ if (*errp == NULL) {
+ error_setg(errp, "Loading VM state failed: %d", ret);
+ }
qemu_file_set_error(f, ret);
/* Cancel bitmaps incoming regardless of recovery */
@@ -3143,6 +3151,8 @@ out:
migrate_postcopy_ram() && postcopy_pause_incoming(mis)) {
/* Reset f to point to the newly created channel */
f = mis->from_src_file;
+ error_free(*errp);
+ *errp = NULL;
goto retry;
}
}
@@ -3176,10 +3186,7 @@ int qemu_loadvm_state(QEMUFile *f, Error **errp)
cpu_synchronize_all_pre_loadvm();
- ret = qemu_loadvm_state_main(f, mis);
- if (ret < 0) {
- error_setg(errp, "Load VM state failed: %d", ret);
- }
+ ret = qemu_loadvm_state_main(f, mis, errp);
qemu_event_set(&mis->main_thread_load_event);
trace_qemu_loadvm_state_post_main(ret);
@@ -3260,9 +3267,9 @@ int qemu_load_device_state(QEMUFile *f, Error **errp)
int ret;
/* Load QEMU_VM_SECTION_FULL section */
- ret = qemu_loadvm_state_main(f, mis);
+ ret = qemu_loadvm_state_main(f, mis, errp);
if (ret < 0) {
- error_setg(errp, "Failed to load device state: %d", ret);
+ error_prepend(errp, "Failed to load device state: %d: ", ret);
return ret;
}
diff --git a/migration/savevm.h b/migration/savevm.h
index
b12681839f0b1afa3255e45215d99c13a224b19f..c337e3e3d111a7f28a57b90f61e8f70b71803d4e
100644
--- a/migration/savevm.h
+++ b/migration/savevm.h
@@ -66,7 +66,8 @@ int qemu_save_device_state(QEMUFile *f);
int qemu_loadvm_state(QEMUFile *f, Error **errp);
void qemu_loadvm_state_cleanup(MigrationIncomingState *mis);
-int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis);
+int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis,
+ Error **errp);
int qemu_load_device_state(QEMUFile *f, Error **errp);
int qemu_loadvm_approve_switchover(void);
int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
