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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 "qemu_socket.h"
#include "migration.h"
#include "qemu-char.h"
#include "sysemu.h"
#include "buffered_file.h"
#include "block.h"
//#define DEBUG_MIGRATION_TCP
#ifdef DEBUG_MIGRATION_TCP
#define dprintf(fmt, ...) \
do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
static int socket_errno(FdMigrationState *s)
{
return errno;
}
static int socket_write(FdMigrationState *s, const void * buf, size_t size)
{
return socket_send(s->fd, buf, size);
}
static int tcp_close(FdMigrationState *s)
{
dprintf("tcp_close\n");
if (s->fd != -1) {
socket_close(s->fd);
s->fd = -1;
}
return 0;
}
static void tcp_wait_for_connect(void *opaque)
{
FdMigrationState *s = opaque;
int ret;
dprintf("connect completed\n");
ret = socket_get_error(s->fd);
if (ret < 0) {
dprintf("error connecting %d\n", val);
migrate_fd_error(s);
return;
}
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
migrate_fd_connect(s);
}
MigrationState *tcp_start_outgoing_migration(const char *host_port,
int64_t bandwidth_limit,
int detach)
{
SockAddress addr;
FdMigrationState *s;
int ret;
if (parse_host_port(&addr, host_port) < 0)
return NULL;
s = qemu_mallocz(sizeof(*s));
s->get_error = socket_errno;
s->write = socket_write;
s->close = tcp_close;
s->mig_state.cancel = migrate_fd_cancel;
s->mig_state.get_status = migrate_fd_get_status;
s->mig_state.release = migrate_fd_release;
s->state = MIG_STATE_ACTIVE;
s->mon_resume = NULL;
s->bandwidth_limit = bandwidth_limit;
s->fd = socket_create_inet(SOCKET_STREAM);
if (s->fd == -1) {
qemu_free(s);
return NULL;
}
socket_set_nonblock(s->fd);
if (!detach)
migrate_fd_monitor_suspend(s);
do {
ret = socket_connect(s->fd, &addr);
if (ret == -1)
ret = -(s->get_error(s));
if (ret == -EINPROGRESS || ret == -EWOULDBLOCK || ret == -EAGAIN)
qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
} while (ret == -EINTR);
if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK && ret != -EAGAIN) {
dprintf("connect failed\n");
socket_close(s->fd);
qemu_free(s);
return NULL;
} else if (ret >= 0)
migrate_fd_connect(s);
return &s->mig_state;
}
static void tcp_accept_incoming_migration(void *opaque)
{
SockAddress addr;
int s = (unsigned long)opaque;
QEMUFile *f;
int c, ret;
c = socket_accept(s, &addr);
dprintf("accepted migration\n");
if (c == -1) {
fprintf(stderr, "could not accept migration connection\n");
return;
}
f = qemu_fopen_socket(c);
if (f == NULL) {
fprintf(stderr, "could not qemu_fopen socket\n");
goto out;
}
vm_stop(0); /* just in case */
ret = qemu_loadvm_state(f);
if (ret < 0) {
fprintf(stderr, "load of migration failed\n");
goto out_fopen;
}
qemu_announce_self();
dprintf("successfully loaded vm state\n");
/* we've successfully migrated, close the server socket */
qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
socket_close(s);
vm_start();
out_fopen:
qemu_fclose(f);
out:
socket_close(c);
}
int tcp_start_incoming_migration(const char *host_port)
{
SockAddress addr;
int s;
if (parse_host_port(&addr, host_port) < 0) {
fprintf(stderr, "invalid host/port combination: %s\n", host_port);
return -EINVAL;
}
s = socket_create_inet(SOCKET_STREAM);
if (s == -1)
return -socket_error();
socket_set_xreuseaddr(s);
if (socket_bind(s, &addr) == -1)
goto err;
if (socket_listen(s, 1) == -1)
goto err;
qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
(void *)(unsigned long)s);
return 0;
err:
socket_close(s);
return -socket_error();
}
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