#include "qemu-common.h"
#include "migration/migration.h"
#include "monitor/monitor.h"
-#include "buffered_file.h"
+#include "migration/qemu-file.h"
#include "sysemu/sysemu.h"
#include "block/block.h"
#include "qemu/sockets.h"
#include "migration/block.h"
+#include "qemu/thread.h"
#include "qmp-commands.h"
//#define DEBUG_MIGRATION
#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
+/* Amount of time to allocate to each "chunk" of bandwidth-throttled
+ * data. */
+#define BUFFER_DELAY 100
+#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
+
/* Migration XBZRLE default cache size */
#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
fd_start_incoming_migration(p, errp);
#endif
else {
- error_setg(errp, "unknown migration protocol: %s\n", uri);
+ error_setg(errp, "unknown migration protocol: %s", uri);
}
}
int ret;
ret = qemu_loadvm_state(f);
- qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
qemu_fclose(f);
if (ret < 0) {
fprintf(stderr, "load of migration failed\n");
}
}
-static void enter_migration_coroutine(void *opaque)
-{
- Coroutine *co = opaque;
- qemu_coroutine_enter(co, NULL);
-}
-
void process_incoming_migration(QEMUFile *f)
{
Coroutine *co = qemu_coroutine_create(process_incoming_migration_co);
assert(fd != -1);
socket_set_nonblock(fd);
- qemu_set_fd_handler(fd, enter_migration_coroutine, NULL, co);
qemu_coroutine_enter(co, f);
}
s->file = NULL;
}
- migrate_fd_close(s);
+ assert(s->fd == -1);
return ret;
}
notifier_list_notify(&migration_state_notifiers, s);
}
-static void migrate_fd_put_notify(void *opaque)
-{
- MigrationState *s = opaque;
- int ret;
-
- qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
- ret = qemu_file_put_notify(s->file);
- if (ret) {
- migrate_fd_error(s);
- }
-}
-
-ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
- size_t size)
+static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
+ size_t size)
{
ssize_t ret;
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_put_ready(MigrationState *s)
-{
- int ret;
-
- if (s->state != MIG_STATE_ACTIVE) {
- DPRINTF("put_ready returning because of non-active state\n");
- return;
- }
-
- DPRINTF("iterate\n");
- ret = qemu_savevm_state_iterate(s->file);
- if (ret < 0) {
- migrate_fd_error(s);
- } else if (ret == 1) {
- int old_vm_running = runstate_is_running();
- int64_t start_time, end_time;
-
- DPRINTF("done iterating\n");
- start_time = qemu_get_clock_ms(rt_clock);
- qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
-
- if (qemu_savevm_state_complete(s->file) < 0) {
- migrate_fd_error(s);
- } else {
- migrate_fd_completed(s);
- }
- end_time = qemu_get_clock_ms(rt_clock);
- s->total_time = end_time - s->total_time;
- s->downtime = end_time - start_time;
- if (s->state != MIG_STATE_COMPLETED) {
- if (old_vm_running) {
- vm_start();
- }
- }
- }
-}
-
static void migrate_fd_cancel(MigrationState *s)
{
if (s->state != MIG_STATE_ACTIVE)
s->state = MIG_STATE_CANCELLED;
notifier_list_notify(&migration_state_notifiers, s);
- qemu_savevm_state_cancel(s->file);
+ qemu_savevm_state_cancel();
migrate_fd_cleanup(s);
}
-int migrate_fd_wait_for_unfreeze(MigrationState *s)
-{
- int ret;
-
- DPRINTF("wait for unfreeze\n");
- if (s->state != MIG_STATE_ACTIVE)
- return -EINVAL;
-
- 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);
-
- if (ret == -1) {
- return -s->get_error(s);
- }
- return 0;
-}
-
int migrate_fd_close(MigrationState *s)
{
int rc = 0;
if (s->fd != -1) {
- qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
rc = s->close(s);
s->fd = -1;
}
s->state == MIG_STATE_ERROR);
}
-void migrate_fd_connect(MigrationState *s)
-{
- int ret;
-
- s->state = MIG_STATE_ACTIVE;
- s->file = qemu_fopen_ops_buffered(s);
-
- DPRINTF("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->file, &s->params);
- if (ret < 0) {
- DPRINTF("failed, %d\n", ret);
- migrate_fd_error(s);
- return;
- }
- migrate_fd_put_ready(s);
-}
-
static MigrationState *migrate_init(const MigrationParams *params)
{
MigrationState *s = migrate_get_current();
error_propagate(errp, local_err);
return;
}
-
- notifier_list_notify(&migration_state_notifiers, s);
}
void qmp_migrate_cancel(Error **errp)
return s->xbzrle_cache_size;
}
+
+/* migration thread support */
+
+
+static ssize_t buffered_flush(MigrationState *s)
+{
+ size_t offset = 0;
+ ssize_t ret = 0;
+
+ DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
+
+ while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
+ size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
+ ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send);
+ if (ret <= 0) {
+ DPRINTF("error flushing data, %zd\n", ret);
+ break;
+ } else {
+ DPRINTF("flushed %zd byte(s)\n", ret);
+ offset += ret;
+ s->bytes_xfer += ret;
+ }
+ }
+
+ DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
+ memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
+ s->buffer_size -= offset;
+
+ if (ret < 0) {
+ return ret;
+ }
+ return offset;
+}
+
+static int buffered_put_buffer(void *opaque, const uint8_t *buf,
+ int64_t pos, int size)
+{
+ MigrationState *s = opaque;
+ ssize_t error;
+
+ DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
+
+ error = qemu_file_get_error(s->file);
+ if (error) {
+ DPRINTF("flush when error, bailing: %s\n", strerror(-error));
+ return error;
+ }
+
+ if (size <= 0) {
+ return size;
+ }
+
+ if (size > (s->buffer_capacity - s->buffer_size)) {
+ DPRINTF("increasing buffer capacity from %zu by %zu\n",
+ s->buffer_capacity, size + 1024);
+
+ s->buffer_capacity += size + 1024;
+
+ s->buffer = g_realloc(s->buffer, s->buffer_capacity);
+ }
+
+ memcpy(s->buffer + s->buffer_size, buf, size);
+ s->buffer_size += size;
+
+ return size;
+}
+
+static int buffered_close(void *opaque)
+{
+ MigrationState *s = opaque;
+ ssize_t ret = 0;
+ int ret2;
+
+ DPRINTF("closing\n");
+
+ s->xfer_limit = INT_MAX;
+ while (!qemu_file_get_error(s->file) && s->buffer_size) {
+ ret = buffered_flush(s);
+ if (ret < 0) {
+ break;
+ }
+ }
+
+ ret2 = migrate_fd_close(s);
+ if (ret >= 0) {
+ ret = ret2;
+ }
+ s->complete = true;
+ return ret;
+}
+
+static int buffered_get_fd(void *opaque)
+{
+ MigrationState *s = opaque;
+
+ return s->fd;
+}
+
+/*
+ * The meaning of the return values is:
+ * 0: We can continue sending
+ * 1: Time to stop
+ * negative: There has been an error
+ */
+static int buffered_rate_limit(void *opaque)
+{
+ MigrationState *s = opaque;
+ int ret;
+
+ ret = qemu_file_get_error(s->file);
+ if (ret) {
+ return ret;
+ }
+
+ if (s->bytes_xfer >= s->xfer_limit) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
+{
+ MigrationState *s = opaque;
+ if (qemu_file_get_error(s->file)) {
+ goto out;
+ }
+ if (new_rate > SIZE_MAX) {
+ new_rate = SIZE_MAX;
+ }
+
+ s->xfer_limit = new_rate / XFER_LIMIT_RATIO;
+
+out:
+ return s->xfer_limit;
+}
+
+static int64_t buffered_get_rate_limit(void *opaque)
+{
+ MigrationState *s = opaque;
+
+ return s->xfer_limit;
+}
+
+static void *buffered_file_thread(void *opaque)
+{
+ MigrationState *s = opaque;
+ int64_t initial_time = qemu_get_clock_ms(rt_clock);
+ int64_t max_size = 0;
+ bool last_round = false;
+ int ret;
+
+ qemu_mutex_lock_iothread();
+ DPRINTF("beginning savevm\n");
+ ret = qemu_savevm_state_begin(s->file, &s->params);
+ if (ret < 0) {
+ DPRINTF("failed, %d\n", ret);
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+ qemu_mutex_unlock_iothread();
+
+ while (true) {
+ int64_t current_time = qemu_get_clock_ms(rt_clock);
+ uint64_t pending_size;
+
+ qemu_mutex_lock_iothread();
+ if (s->state != MIG_STATE_ACTIVE) {
+ DPRINTF("put_ready returning because of non-active state\n");
+ qemu_mutex_unlock_iothread();
+ break;
+ }
+ if (s->complete) {
+ qemu_mutex_unlock_iothread();
+ break;
+ }
+ if (s->bytes_xfer < s->xfer_limit) {
+ DPRINTF("iterate\n");
+ pending_size = qemu_savevm_state_pending(s->file, max_size);
+ DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
+ if (pending_size && pending_size >= max_size) {
+ ret = qemu_savevm_state_iterate(s->file);
+ if (ret < 0) {
+ qemu_mutex_unlock_iothread();
+ break;
+ }
+ } else {
+ int old_vm_running = runstate_is_running();
+ int64_t start_time, end_time;
+
+ DPRINTF("done iterating\n");
+ start_time = qemu_get_clock_ms(rt_clock);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ if (old_vm_running) {
+ vm_stop(RUN_STATE_FINISH_MIGRATE);
+ } else {
+ vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ }
+ ret = qemu_savevm_state_complete(s->file);
+ if (ret < 0) {
+ qemu_mutex_unlock_iothread();
+ break;
+ } else {
+ migrate_fd_completed(s);
+ }
+ end_time = qemu_get_clock_ms(rt_clock);
+ s->total_time = end_time - s->total_time;
+ s->downtime = end_time - start_time;
+ if (s->state != MIG_STATE_COMPLETED) {
+ if (old_vm_running) {
+ vm_start();
+ }
+ }
+ last_round = true;
+ }
+ }
+ qemu_mutex_unlock_iothread();
+ if (current_time >= initial_time + BUFFER_DELAY) {
+ uint64_t transferred_bytes = s->bytes_xfer;
+ uint64_t time_spent = current_time - initial_time;
+ double bandwidth = transferred_bytes / time_spent;
+ max_size = bandwidth * migrate_max_downtime() / 1000000;
+
+ DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
+ " bandwidth %g max_size %" PRId64 "\n",
+ transferred_bytes, time_spent, bandwidth, max_size);
+
+ s->bytes_xfer = 0;
+ initial_time = current_time;
+ }
+ if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
+ /* usleep expects microseconds */
+ g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
+ }
+ ret = buffered_flush(s);
+ if (ret < 0) {
+ break;
+ }
+ }
+
+out:
+ if (ret < 0) {
+ migrate_fd_error(s);
+ }
+ g_free(s->buffer);
+ return NULL;
+}
+
+static const QEMUFileOps buffered_file_ops = {
+ .get_fd = buffered_get_fd,
+ .put_buffer = buffered_put_buffer,
+ .close = buffered_close,
+ .rate_limit = buffered_rate_limit,
+ .get_rate_limit = buffered_get_rate_limit,
+ .set_rate_limit = buffered_set_rate_limit,
+};
+
+void migrate_fd_connect(MigrationState *s)
+{
+ s->state = MIG_STATE_ACTIVE;
+ s->bytes_xfer = 0;
+ s->buffer = NULL;
+ s->buffer_size = 0;
+ s->buffer_capacity = 0;
+
+ s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO;
+ s->complete = false;
+
+ s->file = qemu_fopen_ops(s, &buffered_file_ops);
+
+ qemu_thread_create(&s->thread, buffered_file_thread, s,
+ QEMU_THREAD_DETACHED);
+ notifier_list_notify(&migration_state_notifiers, s);
+}
projects / qemu.git / blobdiff