#include "qemu-common.h"
#include "migration.h"
-#include "console.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 uint32_t max_throttle = (32 << 20);
static MigrationState *current_migration;
-void qemu_start_incoming_migration(const char *uri)
+int qemu_start_incoming_migration(const char *uri)
{
- fprintf(stderr, "unknown migration protocol: %s\n", 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 do_migrate(int detach, const char *uri)
+void process_incoming_migration(QEMUFile *f)
{
- term_printf("unknown migration protocol: %s\n", uri);
+ 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();
}
-void do_migrate_cancel(void)
+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 (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;
+ return 0;
+}
+
+int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
MigrationState *s = current_migration;
if (s)
- s->cancel(s);
+ s->cancel(s);
+
+ return 0;
+}
+
+int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+ double d;
+ FdMigrationState *s;
+
+ d = qdict_get_double(qdict, "value");
+ d = MAX(0, MIN(UINT32_MAX, d));
+ 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;
}
-void do_migrate_set_speed(const char *value)
+int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
+ QObject **ret_data)
{
double d;
- char *ptr;
- d = strtod(value, &ptr);
- switch (*ptr) {
- case 'G': case 'g':
- d *= 1024;
- case 'M': case 'm':
- d *= 1024;
- case 'K': case 'k':
- d *= 1024;
- default:
- break;
+ 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);
}
- max_throttle = (uint32_t)d;
+ if (qdict_haskey(qdict, "disk")) {
+ migrate_print_status(mon, "disk", qdict);
+ }
}
-void do_info_migrate(void)
+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) {
- term_printf("Migration status: ");
- switch (s->get_status(s)) {
- case MIG_STATE_ACTIVE:
- term_printf("active\n");
- break;
- case MIG_STATE_COMPLETED:
- term_printf("completed\n");
- break;
- case MIG_STATE_ERROR:
- term_printf("failed\n");
- break;
- case MIG_STATE_CANCELLED:
- term_printf("cancelled\n");
- break;
- }
+ 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;
+ 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;
+ }
+
+ if (s->fd != -1)
+ close(s->fd);
+
+ /* Don't resume monitor until we've flushed all of the buffers */
+ if (s->mon) {
+ monitor_resume(s->mon);
+ }
+
+ 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);
+
+ 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 = vm_running;
+
+ DPRINTF("done iterating\n");
+ vm_stop(0);
+
+ qemu_aio_flush();
+ bdrv_flush_all();
+ 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;
+ }
+ s->state = state;
}
}
+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;
+ 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;
+ migrate_fd_cleanup(s);
+ }
+ qemu_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;
+
+ qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
+ return s->close(s);
+}
projects / qemu.git / blobdiff