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migration: never fail in global_state_store()

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Actually global_state_store() can never fail. Let's get rid of extra
error paths.

To make things clear, use new runstate_get() and use same approach for
global_state_store() and global_state_store_running().

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20230517123752.21615-3-vsementsov@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2023-05-17 15:37:49 +03:00 committed by Juan Quintela
parent 242b74eb69
commit c33f1829f8
4 changed files with 32 additions and 40 deletions
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2
include/migration/global_state.h
View file

@ -16,7 +16,7 @@
#include "qapi/qapi-types-run-state.h"
void register_global_state(void);
int global_state_store(void);
void global_state_store(void);
void global_state_store_running(void);
bool global_state_received(void);
RunState global_state_get_runstate(void);

23
migration/global_state.c
View file

@ -29,23 +29,22 @@ typedef struct {
static GlobalState global_state;
int global_state_store(void)
static void global_state_do_store(RunState state)
{
if (!runstate_store((char *)global_state.runstate,
sizeof(global_state.runstate))) {
error_report("runstate name too big: %s", global_state.runstate);
trace_migrate_state_too_big();
return -EINVAL;
}
return 0;
const char *state_str = RunState_str(state);
assert(strlen(state_str) < sizeof(global_state.runstate));
strpadcpy((char *)global_state.runstate, sizeof(global_state.runstate),
state_str, '\0');
}
void global_state_store(void)
{
global_state_do_store(runstate_get());
}
void global_state_store_running(void)
{
const char *state = RunState_str(RUN_STATE_RUNNING);
assert(strlen(state) < sizeof(global_state.runstate));
strpadcpy((char *)global_state.runstate, sizeof(global_state.runstate),
state, '\0');
global_state_do_store(RUN_STATE_RUNNING);
}
bool global_state_received(void)

41
migration/migration.c
View file

@ -2288,27 +2288,26 @@ static void migration_completion(MigrationState *s)
s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
s->vm_was_running = runstate_is_running();
ret = global_state_store();
global_state_store();
if (!ret) {
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
trace_migration_completion_vm_stop(ret);
if (ret >= 0) {
ret = migration_maybe_pause(s, &current_active_state,
MIGRATION_STATUS_DEVICE);
}
if (ret >= 0) {
/*
* Inactivate disks except in COLO, and track that we
* have done so in order to remember to reactivate
* them if migration fails or is cancelled.
*/
s->block_inactive = !migrate_colo();
migration_rate_set(RATE_LIMIT_DISABLED);
ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
s->block_inactive);
}
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
trace_migration_completion_vm_stop(ret);
if (ret >= 0) {
ret = migration_maybe_pause(s, &current_active_state,
MIGRATION_STATUS_DEVICE);
}
if (ret >= 0) {
/*
* Inactivate disks except in COLO, and track that we
* have done so in order to remember to reactivate
* them if migration fails or is cancelled.
*/
s->block_inactive = !migrate_colo();
migration_rate_set(RATE_LIMIT_DISABLED);
ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
s->block_inactive);
}
qemu_mutex_unlock_iothread();
if (ret < 0) {
@ -3088,9 +3087,7 @@ static void *bg_migration_thread(void *opaque)
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
s->vm_was_running = runstate_is_running();
if (global_state_store()) {
goto fail;
}
global_state_store();
/* Forcibly stop VM before saving state of vCPUs and devices */
if (vm_stop_force_state(RUN_STATE_PAUSED)) {
goto fail;

6
migration/savevm.c
View file

@ -2919,11 +2919,7 @@ bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
saved_vm_running = runstate_is_running();
ret = global_state_store();
if (ret) {
error_setg(errp, "Error saving global state");
return false;
}
global_state_store();
vm_stop(RUN_STATE_SAVE_VM);
bdrv_drain_all_begin();