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/*
* QEMU live migration via socket
*
* Copyright Red Hat, Inc. 2009-2016
*
* Authors:
* Chris Lalancette <clalance@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "channel.h"
#include "socket.h"
#include "migration.h"
#include "qemu-file.h"
#include "io/channel-socket.h"
#include "io/net-listener.h"
#include "trace.h"
#include "postcopy-ram.h"
struct SocketOutgoingArgs {
SocketAddress *saddr;
} outgoing_args;
void socket_send_channel_create(QIOTaskFunc f, void *data)
{
QIOChannelSocket *sioc = qio_channel_socket_new();
qio_channel_socket_connect_async(sioc, outgoing_args.saddr,
f, data, NULL, NULL);
}
QIOChannel *socket_send_channel_create_sync(Error **errp)
{
QIOChannelSocket *sioc = qio_channel_socket_new();
if (!outgoing_args.saddr) {
object_unref(OBJECT(sioc));
error_setg(errp, "Initial sock address not set!");
return NULL;
}
if (qio_channel_socket_connect_sync(sioc, outgoing_args.saddr, errp) < 0) {
object_unref(OBJECT(sioc));
return NULL;
}
return QIO_CHANNEL(sioc);
}
int socket_send_channel_destroy(QIOChannel *send)
{
/* Remove channel */
object_unref(OBJECT(send));
if (outgoing_args.saddr) {
qapi_free_SocketAddress(outgoing_args.saddr);
outgoing_args.saddr = NULL;
}
return 0;
}
struct SocketConnectData {
MigrationState *s;
char *hostname;
};
static void socket_connect_data_free(void *opaque)
{
struct SocketConnectData *data = opaque;
if (!data) {
return;
}
g_free(data->hostname);
g_free(data);
}
static void socket_outgoing_migration(QIOTask *task,
gpointer opaque)
{
struct SocketConnectData *data = opaque;
QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
Error *err = NULL;
if (qio_task_propagate_error(task, &err)) {
trace_migration_socket_outgoing_error(error_get_pretty(err));
goto out;
}
trace_migration_socket_outgoing_connected(data->hostname);
if (migrate_use_zero_copy_send() &&
!qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) {
error_setg(&err, "Zero copy send feature not detected in host kernel");
}
out:
migration_channel_connect(data->s, sioc, data->hostname, err);
object_unref(OBJECT(sioc));
}
static void
socket_start_outgoing_migration_internal(MigrationState *s,
SocketAddress *saddr,
Error **errp)
{
QIOChannelSocket *sioc = qio_channel_socket_new();
struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
data->s = s;
/* in case previous migration leaked it */
qapi_free_SocketAddress(outgoing_args.saddr);
outgoing_args.saddr = saddr;
if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
data->hostname = g_strdup(saddr->u.inet.host);
}
qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
qio_channel_socket_connect_async(sioc,
saddr,
socket_outgoing_migration,
data,
socket_connect_data_free,
NULL);
}
void socket_start_outgoing_migration(MigrationState *s,
const char *str,
Error **errp)
{
Error *err = NULL;
SocketAddress *saddr = socket_parse(str, &err);
if (!err) {
socket_start_outgoing_migration_internal(s, saddr, &err);
}
error_propagate(errp, err);
}
static void socket_accept_incoming_migration(QIONetListener *listener,
QIOChannelSocket *cioc,
gpointer opaque)
{
trace_migration_socket_incoming_accepted();
if (migration_has_all_channels()) {
error_report("%s: Extra incoming migration connection; ignoring",
__func__);
return;
}
qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
migration_channel_process_incoming(QIO_CHANNEL(cioc));
}
static void
socket_incoming_migration_end(void *opaque)
{
QIONetListener *listener = opaque;
qio_net_listener_disconnect(listener);
object_unref(OBJECT(listener));
}
static void
socket_start_incoming_migration_internal(SocketAddress *saddr,
Error **errp)
{
QIONetListener *listener = qio_net_listener_new();
MigrationIncomingState *mis = migration_incoming_get_current();
size_t i;
int num = 1;
qio_net_listener_set_name(listener, "migration-socket-listener");
if (migrate_use_multifd()) {
num = migrate_multifd_channels();
} else if (migrate_postcopy_preempt()) {
num = RAM_CHANNEL_MAX;
}
if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
object_unref(OBJECT(listener));
return;
}
mis->transport_data = listener;
mis->transport_cleanup = socket_incoming_migration_end;
qio_net_listener_set_client_func_full(listener,
socket_accept_incoming_migration,
NULL, NULL,
g_main_context_get_thread_default());
for (i = 0; i < listener->nsioc; i++) {
SocketAddress *address =
qio_channel_socket_get_local_address(listener->sioc[i], errp);
if (!address) {
return;
}
migrate_add_address(address);
qapi_free_SocketAddress(address);
}
}
void socket_start_incoming_migration(const char *str, Error **errp)
{
Error *err = NULL;
SocketAddress *saddr = socket_parse(str, &err);
if (!err) {
socket_start_incoming_migration_internal(saddr, &err);
}
qapi_free_SocketAddress(saddr);
error_propagate(errp, err);
}
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