On 2025/07/21 20:29, Arun Menon wrote:
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 loadvm_process_command() must report an error
in errp, in case of failure.
Signed-off-by: Arun Menon <arme...@redhat.com>
---
migration/savevm.c | 87 +++++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 66 insertions(+), 21 deletions(-)
diff --git a/migration/savevm.c b/migration/savevm.c
index
96af7b412f2ed43468f4bcac8b833cda223f8321..d8feb9e1599d019636cd400ee7ebe594df27bd1d
100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2546,12 +2546,13 @@ static int loadvm_postcopy_handle_switchover_start(void)
* LOADVM_QUIT All good, but exit the loop
* <0 Error
*/
-static int loadvm_process_command(QEMUFile *f)
+static int loadvm_process_command(QEMUFile *f, Error **errp)
{
MigrationIncomingState *mis = migration_incoming_get_current();
uint16_t cmd;
uint16_t len;
uint32_t tmp32;
+ int ret;
cmd = qemu_get_be16(f);
len = qemu_get_be16(f);
@@ -2562,16 +2563,16 @@ static int loadvm_process_command(QEMUFile *f)
}
if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) {
- error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len);
+ error_setg(errp, "MIG_CMD 0x%x unknown (len 0x%x)", cmd, len);
return -EINVAL;
}
trace_loadvm_process_command(mig_cmd_args[cmd].name, len);
if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) {
- error_report("%s received with bad length - expecting %zu, got %d",
- mig_cmd_args[cmd].name,
- (size_t)mig_cmd_args[cmd].len, len);
+ error_setg(errp, "%s received with bad length - expecting %zu, got %d",
+ mig_cmd_args[cmd].name,
+ (size_t)mig_cmd_args[cmd].len, len);
return -ERANGE;
}
@@ -2590,11 +2591,10 @@ static int loadvm_process_command(QEMUFile *f)
* been created.
*/
if (migrate_switchover_ack() && !mis->switchover_ack_pending_num) {
- int ret = migrate_send_rp_switchover_ack(mis);
+ ret = migrate_send_rp_switchover_ack(mis);
if (ret) {
- error_report(
- "Could not send switchover ack RP MSG, err %d (%s)", ret,
- strerror(-ret));
+ error_setg(errp, "Could not send switchover ack "
+ "RP MSG, err %d (%s)", ret, strerror(-ret));
return ret;
}
}
@@ -2604,39 +2604,84 @@ static int loadvm_process_command(QEMUFile *f)
tmp32 = qemu_get_be32(f);
trace_loadvm_process_command_ping(tmp32);
if (!mis->to_src_file) {
- error_report("CMD_PING (0x%x) received with no return path",
- tmp32);
+ error_setg(errp, "CMD_PING (0x%x) received with no return path",
+ tmp32);
return -1;
}
migrate_send_rp_pong(mis, tmp32);
break;
case MIG_CMD_PACKAGED:
- return loadvm_handle_cmd_packaged(mis);
+ ret = loadvm_handle_cmd_packaged(mis);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
This "return -1" is extraneous.
The error_setg() call is later replaced with "[PATCH v6 09/24]
migration: push Error **errp into loadvm_handle_cmd_packaged()", but
this "return -1" is simply removed in the patch. There is no need to add
it in the first place.
+ }
+ return ret;
case MIG_CMD_POSTCOPY_ADVISE:
- return loadvm_postcopy_handle_advise(mis, len);
+ ret = loadvm_postcopy_handle_advise(mis, len);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_POSTCOPY_LISTEN:
- return loadvm_postcopy_handle_listen(mis);
+ ret = loadvm_postcopy_handle_listen(mis);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_POSTCOPY_RUN:
- return loadvm_postcopy_handle_run(mis);
+ ret = loadvm_postcopy_handle_run(mis);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_POSTCOPY_RAM_DISCARD:
- return loadvm_postcopy_ram_handle_discard(mis, len);
+ ret = loadvm_postcopy_ram_handle_discard(mis, len);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_POSTCOPY_RESUME:
- return loadvm_postcopy_handle_resume(mis);
+ ret = loadvm_postcopy_handle_resume(mis);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_RECV_BITMAP:
- return loadvm_handle_recv_bitmap(mis, len);
+ ret = loadvm_handle_recv_bitmap(mis, len);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_ENABLE_COLO:
- return loadvm_process_enable_colo(mis);
+ ret = loadvm_process_enable_colo(mis);
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
case MIG_CMD_SWITCHOVER_START:
- return loadvm_postcopy_handle_switchover_start();
+ ret = loadvm_postcopy_handle_switchover_start();
+ if (ret < 0) {
+ error_setg(errp, "Failed to load device state command: %d", ret);
+ return -1;
+ }
+ return ret;
}
return 0;
@@ -3074,7 +3119,7 @@ retry:
}
break;
case QEMU_VM_COMMAND:
- ret = loadvm_process_command(f);
+ ret = loadvm_process_command(f, NULL);
trace_qemu_loadvm_state_section_command(ret);
if ((ret < 0) || (ret == LOADVM_QUIT)) {
goto out;
