qemu/migration-fd.c
Jan Kiszka f327aa0c60 live migration: Propagate output monitor to callback handler
In order to allow proper progress reporting to the monitor that
initiated the migration, forward the monitor reference through the
migration layer down to SaveLiveStateHandler.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03 10:48:53 -06:00

144 lines
3.1 KiB
C

/*
* QEMU live migration via generic fd
*
* Copyright Red Hat, Inc. 2009
*
* Authors:
* Chris Lalancette <clalance@redhat.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 "monitor.h"
#include "qemu-char.h"
#include "sysemu.h"
#include "buffered_file.h"
#include "block.h"
#include "qemu_socket.h"
//#define DEBUG_MIGRATION_FD
#ifdef DEBUG_MIGRATION_FD
#define dprintf(fmt, ...) \
do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
static int fd_errno(FdMigrationState *s)
{
return errno;
}
static int fd_write(FdMigrationState *s, const void * buf, size_t size)
{
return write(s->fd, buf, size);
}
static int fd_close(FdMigrationState *s)
{
dprintf("fd_close\n");
if (s->fd != -1) {
close(s->fd);
s->fd = -1;
}
return 0;
}
MigrationState *fd_start_outgoing_migration(Monitor *mon,
const char *fdname,
int64_t bandwidth_limit,
int detach,
int blk,
int inc)
{
FdMigrationState *s;
s = qemu_mallocz(sizeof(*s));
s->fd = monitor_get_fd(mon, fdname);
if (s->fd == -1) {
dprintf("fd_migration: invalid file descriptor identifier\n");
goto err_after_alloc;
}
if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
dprintf("Unable to set nonblocking mode on file descriptor\n");
goto err_after_open;
}
s->get_error = fd_errno;
s->write = fd_write;
s->close = fd_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;
if (!detach) {
migrate_fd_monitor_suspend(s, mon);
}
migrate_fd_connect(s);
return &s->mig_state;
err_after_open:
close(s->fd);
err_after_alloc:
qemu_free(s);
return NULL;
}
static void fd_accept_incoming_migration(void *opaque)
{
QEMUFile *f = opaque;
int ret;
ret = qemu_loadvm_state(f);
if (ret < 0) {
fprintf(stderr, "load of migration failed\n");
goto err;
}
qemu_announce_self();
dprintf("successfully loaded vm state\n");
/* we've successfully migrated, close the fd */
qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
if (autostart)
vm_start();
err:
qemu_fclose(f);
}
int fd_start_incoming_migration(const char *infd)
{
int fd;
QEMUFile *f;
dprintf("Attempting to start an incoming migration via fd\n");
fd = strtol(infd, NULL, 0);
f = qemu_fdopen(fd, "rb");
if(f == NULL) {
dprintf("Unable to apply qemu wrapper to file descriptor\n");
return -errno;
}
qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL,
(void *)(unsigned long)f);
return 0;
}