mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 01:43:39 +00:00
![Shahar Havivi](/assets/img/avatar_default.png)
Signed-off-by: Shahar Havivi <shaharh@redhat.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
205 lines
4.6 KiB
C
205 lines
4.6 KiB
C
/*
|
|
* 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 socket_error();
|
|
}
|
|
|
|
static int socket_write(FdMigrationState *s, const void * buf, size_t size)
|
|
{
|
|
return send(s->fd, buf, size, 0);
|
|
}
|
|
|
|
static int tcp_close(FdMigrationState *s)
|
|
{
|
|
DPRINTF("tcp_close\n");
|
|
if (s->fd != -1) {
|
|
close(s->fd);
|
|
s->fd = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void tcp_wait_for_connect(void *opaque)
|
|
{
|
|
FdMigrationState *s = opaque;
|
|
int val, ret;
|
|
socklen_t valsize = sizeof(val);
|
|
|
|
DPRINTF("connect completed\n");
|
|
do {
|
|
ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
|
|
} while (ret == -1 && (s->get_error(s)) == EINTR);
|
|
|
|
if (ret < 0) {
|
|
migrate_fd_error(s);
|
|
return;
|
|
}
|
|
|
|
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
|
|
|
|
if (val == 0)
|
|
migrate_fd_connect(s);
|
|
else {
|
|
DPRINTF("error connecting %d\n", val);
|
|
migrate_fd_error(s);
|
|
}
|
|
}
|
|
|
|
MigrationState *tcp_start_outgoing_migration(Monitor *mon,
|
|
const char *host_port,
|
|
int64_t bandwidth_limit,
|
|
int detach,
|
|
int blk,
|
|
int inc)
|
|
{
|
|
struct sockaddr_in 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->mig_state.blk = blk;
|
|
s->mig_state.shared = inc;
|
|
|
|
s->state = MIG_STATE_ACTIVE;
|
|
s->mon = NULL;
|
|
s->bandwidth_limit = bandwidth_limit;
|
|
s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
|
|
if (s->fd == -1) {
|
|
qemu_free(s);
|
|
return NULL;
|
|
}
|
|
|
|
socket_set_nonblock(s->fd);
|
|
|
|
if (!detach) {
|
|
migrate_fd_monitor_suspend(s, mon);
|
|
}
|
|
|
|
do {
|
|
ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
|
|
if (ret == -1)
|
|
ret = -(s->get_error(s));
|
|
|
|
if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
|
|
qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
|
|
} while (ret == -EINTR);
|
|
|
|
if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
|
|
DPRINTF("connect failed\n");
|
|
migrate_fd_error(s);
|
|
} else if (ret >= 0)
|
|
migrate_fd_connect(s);
|
|
|
|
return &s->mig_state;
|
|
}
|
|
|
|
static void tcp_accept_incoming_migration(void *opaque)
|
|
{
|
|
struct sockaddr_in addr;
|
|
socklen_t addrlen = sizeof(addr);
|
|
int s = (unsigned long)opaque;
|
|
QEMUFile *f;
|
|
int c;
|
|
|
|
do {
|
|
c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
|
|
} while (c == -1 && socket_error() == EINTR);
|
|
|
|
DPRINTF("accepted migration\n");
|
|
|
|
if (c == -1) {
|
|
fprintf(stderr, "could not accept migration connection\n");
|
|
goto out2;
|
|
}
|
|
|
|
f = qemu_fopen_socket(c);
|
|
if (f == NULL) {
|
|
fprintf(stderr, "could not qemu_fopen socket\n");
|
|
goto out;
|
|
}
|
|
|
|
process_incoming_migration(f);
|
|
qemu_fclose(f);
|
|
out:
|
|
close(c);
|
|
out2:
|
|
qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
|
|
close(s);
|
|
}
|
|
|
|
int tcp_start_incoming_migration(const char *host_port)
|
|
{
|
|
struct sockaddr_in addr;
|
|
int val;
|
|
int s;
|
|
|
|
if (parse_host_port(&addr, host_port) < 0) {
|
|
fprintf(stderr, "invalid host/port combination: %s\n", host_port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
s = qemu_socket(PF_INET, SOCK_STREAM, 0);
|
|
if (s == -1)
|
|
return -socket_error();
|
|
|
|
val = 1;
|
|
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
|
|
|
|
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
|
|
goto err;
|
|
|
|
if (listen(s, 1) == -1)
|
|
goto err;
|
|
|
|
qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
|
|
(void *)(unsigned long)s);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
close(s);
|
|
return -socket_error();
|
|
}
|