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xemu/migration.c
Luiz Capitulino 0461d5a699 RunState: Rename enum values as generated by the QAPI 
Next commit will convert the query-status command to use the
RunState type as generated by the QAPI.

In order to "transparently" replace the current enum by the QAPI
one, we have to make some changes to some enum values.

As the changes are simple renames, I'll do them in one shot. The
changes are:

 - Rename the prefix from RSTATE_ to RUN_STATE_
 - RUN_STATE_SAVEVM to RUN_STATE_SAVE_VM
 - RUN_STATE_IN_MIGRATE to RUN_STATE_INMIGRATE
 - RUN_STATE_PANICKED to RUN_STATE_INTERNAL_ERROR
 - RUN_STATE_POST_MIGRATE to RUN_STATE_POSTMIGRATE
 - RUN_STATE_PRE_LAUNCH to RUN_STATE_PRELAUNCH
 - RUN_STATE_PRE_MIGRATE to RUN_STATE_PREMIGRATE
 - RUN_STATE_RESTORE to RUN_STATE_RESTORE_VM
 - RUN_STATE_PRE_MIGRATE to RUN_STATE_FINISH_MIGRATE

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-10-04 11:02:57 -03:00

486 lines
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/*
* QEMU live migration
*
* Copyright IBM, Corp. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "qemu-common.h"
#include "migration.h"
#include "monitor.h"
#include "buffered_file.h"
#include "sysemu.h"
#include "block.h"
#include "qemu_socket.h"
#include "block-migration.h"
#include "qemu-objects.h"
//#define DEBUG_MIGRATION
#ifdef DEBUG_MIGRATION
#define DPRINTF(fmt, ...) \
do { printf("migration: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
/* Migration speed throttling */
static int64_t max_throttle = (32 << 20);
static MigrationState *current_migration;
static NotifierList migration_state_notifiers =
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
int qemu_start_incoming_migration(const char *uri)
{
const char *p;
int ret;
if (strstart(uri, "tcp:", &p))
ret = tcp_start_incoming_migration(p);
#if !defined(WIN32)
else if (strstart(uri, "exec:", &p))
ret = exec_start_incoming_migration(p);
else if (strstart(uri, "unix:", &p))
ret = unix_start_incoming_migration(p);
else if (strstart(uri, "fd:", &p))
ret = fd_start_incoming_migration(p);
#endif
else {
fprintf(stderr, "unknown migration protocol: %s\n", uri);
ret = -EPROTONOSUPPORT;
}
return ret;
}
void process_incoming_migration(QEMUFile *f)
{
if (qemu_loadvm_state(f) < 0) {
fprintf(stderr, "load of migration failed\n");
exit(0);
}
qemu_announce_self();
DPRINTF("successfully loaded vm state\n");
if (autostart) {
vm_start();
} else {
runstate_set(RUN_STATE_PRELAUNCH);
}
}
int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
MigrationState *s = NULL;
const char *p;
int detach = qdict_get_try_bool(qdict, "detach", 0);
int blk = qdict_get_try_bool(qdict, "blk", 0);
int inc = qdict_get_try_bool(qdict, "inc", 0);
const char *uri = qdict_get_str(qdict, "uri");
if (current_migration &&
current_migration->get_status(current_migration) == MIG_STATE_ACTIVE) {
monitor_printf(mon, "migration already in progress\n");
return -1;
}
if (qemu_savevm_state_blocked(mon)) {
return -1;
}
if (strstart(uri, "tcp:", &p)) {
s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
blk, inc);
#if !defined(WIN32)
} else if (strstart(uri, "exec:", &p)) {
s = exec_start_outgoing_migration(mon, p, max_throttle, detach,
blk, inc);
} else if (strstart(uri, "unix:", &p)) {
s = unix_start_outgoing_migration(mon, p, max_throttle, detach,
blk, inc);
} else if (strstart(uri, "fd:", &p)) {
s = fd_start_outgoing_migration(mon, p, max_throttle, detach,
blk, inc);
#endif
} else {
monitor_printf(mon, "unknown migration protocol: %s\n", uri);
return -1;
}
if (s == NULL) {
monitor_printf(mon, "migration failed\n");
return -1;
}
if (current_migration) {
current_migration->release(current_migration);
}
current_migration = s;
notifier_list_notify(&migration_state_notifiers, NULL);
return 0;
}
int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
MigrationState *s = current_migration;
if (s)
s->cancel(s);
return 0;
}
int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
int64_t d;
FdMigrationState *s;
d = qdict_get_int(qdict, "value");
if (d < 0) {
d = 0;
}
max_throttle = d;
s = migrate_to_fms(current_migration);
if (s && s->file) {
qemu_file_set_rate_limit(s->file, max_throttle);
}
return 0;
}
/* amount of nanoseconds we are willing to wait for migration to be down.
* the choice of nanoseconds is because it is the maximum resolution that
* get_clock() can achieve. It is an internal measure. All user-visible
* units must be in seconds */
static uint64_t max_downtime = 30000000;
uint64_t migrate_max_downtime(void)
{
return max_downtime;
}
int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
QObject **ret_data)
{
double d;
d = qdict_get_double(qdict, "value") * 1e9;
d = MAX(0, MIN(UINT64_MAX, d));
max_downtime = (uint64_t)d;
return 0;
}
static void migrate_print_status(Monitor *mon, const char *name,
const QDict *status_dict)
{
QDict *qdict;
qdict = qobject_to_qdict(qdict_get(status_dict, name));
monitor_printf(mon, "transferred %s: %" PRIu64 " kbytes\n", name,
qdict_get_int(qdict, "transferred") >> 10);
monitor_printf(mon, "remaining %s: %" PRIu64 " kbytes\n", name,
qdict_get_int(qdict, "remaining") >> 10);
monitor_printf(mon, "total %s: %" PRIu64 " kbytes\n", name,
qdict_get_int(qdict, "total") >> 10);
}
void do_info_migrate_print(Monitor *mon, const QObject *data)
{
QDict *qdict;
qdict = qobject_to_qdict(data);
monitor_printf(mon, "Migration status: %s\n",
qdict_get_str(qdict, "status"));
if (qdict_haskey(qdict, "ram")) {
migrate_print_status(mon, "ram", qdict);
}
if (qdict_haskey(qdict, "disk")) {
migrate_print_status(mon, "disk", qdict);
}
}
static void migrate_put_status(QDict *qdict, const char *name,
uint64_t trans, uint64_t rem, uint64_t total)
{
QObject *obj;
obj = qobject_from_jsonf("{ 'transferred': %" PRId64 ", "
"'remaining': %" PRId64 ", "
"'total': %" PRId64 " }", trans, rem, total);
qdict_put_obj(qdict, name, obj);
}
void do_info_migrate(Monitor *mon, QObject **ret_data)
{
QDict *qdict;
MigrationState *s = current_migration;
if (s) {
switch (s->get_status(s)) {
case MIG_STATE_ACTIVE:
qdict = qdict_new();
qdict_put(qdict, "status", qstring_from_str("active"));
migrate_put_status(qdict, "ram", ram_bytes_transferred(),
ram_bytes_remaining(), ram_bytes_total());
if (blk_mig_active()) {
migrate_put_status(qdict, "disk", blk_mig_bytes_transferred(),
blk_mig_bytes_remaining(),
blk_mig_bytes_total());
}
*ret_data = QOBJECT(qdict);
break;
case MIG_STATE_COMPLETED:
*ret_data = qobject_from_jsonf("{ 'status': 'completed' }");
break;
case MIG_STATE_ERROR:
*ret_data = qobject_from_jsonf("{ 'status': 'failed' }");
break;
case MIG_STATE_CANCELLED:
*ret_data = qobject_from_jsonf("{ 'status': 'cancelled' }");
break;
}
}
}
/* shared migration helpers */
void migrate_fd_monitor_suspend(FdMigrationState *s, Monitor *mon)
{
s->mon = mon;
if (monitor_suspend(mon) == 0) {
DPRINTF("suspending monitor\n");
} else {
monitor_printf(mon, "terminal does not allow synchronous "
"migration, continuing detached\n");
}
}
void migrate_fd_error(FdMigrationState *s)
{
DPRINTF("setting error state\n");
s->state = MIG_STATE_ERROR;
notifier_list_notify(&migration_state_notifiers, NULL);
migrate_fd_cleanup(s);
}
int migrate_fd_cleanup(FdMigrationState *s)
{
int ret = 0;
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
if (s->file) {
DPRINTF("closing file\n");
if (qemu_fclose(s->file) != 0) {
ret = -1;
}
s->file = NULL;
} else {
if (s->mon) {
monitor_resume(s->mon);
}
}
if (s->fd != -1) {
close(s->fd);
s->fd = -1;
}
return ret;
}
void migrate_fd_put_notify(void *opaque)
{
FdMigrationState *s = opaque;
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
qemu_file_put_notify(s->file);
}
ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
{
FdMigrationState *s = opaque;
ssize_t ret;
do {
ret = s->write(s, data, size);
} while (ret == -1 && ((s->get_error(s)) == EINTR));
if (ret == -1)
ret = -(s->get_error(s));
if (ret == -EAGAIN) {
qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
} else if (ret < 0) {
s->state = MIG_STATE_ERROR;
notifier_list_notify(&migration_state_notifiers, NULL);
}
return ret;
}
void migrate_fd_connect(FdMigrationState *s)
{
int ret;
s->file = qemu_fopen_ops_buffered(s,
s->bandwidth_limit,
migrate_fd_put_buffer,
migrate_fd_put_ready,
migrate_fd_wait_for_unfreeze,
migrate_fd_close);
DPRINTF("beginning savevm\n");
ret = qemu_savevm_state_begin(s->mon, s->file, s->mig_state.blk,
s->mig_state.shared);
if (ret < 0) {
DPRINTF("failed, %d\n", ret);
migrate_fd_error(s);
return;
}
migrate_fd_put_ready(s);
}
void migrate_fd_put_ready(void *opaque)
{
FdMigrationState *s = opaque;
if (s->state != MIG_STATE_ACTIVE) {
DPRINTF("put_ready returning because of non-active state\n");
return;
}
DPRINTF("iterate\n");
if (qemu_savevm_state_iterate(s->mon, s->file) == 1) {
int state;
int old_vm_running = runstate_is_running();
DPRINTF("done iterating\n");
vm_stop(RUN_STATE_FINISH_MIGRATE);
if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) {
if (old_vm_running) {
vm_start();
}
state = MIG_STATE_ERROR;
} else {
state = MIG_STATE_COMPLETED;
}
if (migrate_fd_cleanup(s) < 0) {
if (old_vm_running) {
vm_start();
}
state = MIG_STATE_ERROR;
}
if (state == MIG_STATE_COMPLETED) {
runstate_set(RUN_STATE_POSTMIGRATE);
}
s->state = state;
notifier_list_notify(&migration_state_notifiers, NULL);
}
}
int migrate_fd_get_status(MigrationState *mig_state)
{
FdMigrationState *s = migrate_to_fms(mig_state);
return s->state;
}
void migrate_fd_cancel(MigrationState *mig_state)
{
FdMigrationState *s = migrate_to_fms(mig_state);
if (s->state != MIG_STATE_ACTIVE)
return;
DPRINTF("cancelling migration\n");
s->state = MIG_STATE_CANCELLED;
notifier_list_notify(&migration_state_notifiers, NULL);
qemu_savevm_state_cancel(s->mon, s->file);
migrate_fd_cleanup(s);
}
void migrate_fd_release(MigrationState *mig_state)
{
FdMigrationState *s = migrate_to_fms(mig_state);
DPRINTF("releasing state\n");
if (s->state == MIG_STATE_ACTIVE) {
s->state = MIG_STATE_CANCELLED;
notifier_list_notify(&migration_state_notifiers, NULL);
migrate_fd_cleanup(s);
}
g_free(s);
}
void migrate_fd_wait_for_unfreeze(void *opaque)
{
FdMigrationState *s = opaque;
int ret;
DPRINTF("wait for unfreeze\n");
if (s->state != MIG_STATE_ACTIVE)
return;
do {
fd_set wfds;
FD_ZERO(&wfds);
FD_SET(s->fd, &wfds);
ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
} while (ret == -1 && (s->get_error(s)) == EINTR);
}
int migrate_fd_close(void *opaque)
{
FdMigrationState *s = opaque;
if (s->mon) {
monitor_resume(s->mon);
}
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
return s->close(s);
}
void add_migration_state_change_notifier(Notifier *notify)
{
notifier_list_add(&migration_state_notifiers, notify);
}
void remove_migration_state_change_notifier(Notifier *notify)
{
notifier_list_remove(&migration_state_notifiers, notify);
}
int get_migration_state(void)
{
if (current_migration) {
return migrate_fd_get_status(current_migration);
} else {
return MIG_STATE_ERROR;
}
}
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