qemu/migration-exec.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

149 lines
3.2 KiB
C

/*
* QEMU live migration
*
* Copyright IBM, Corp. 2008
* Copyright Dell MessageOne 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Charles Duffy <charles_duffy@messageone.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_EXEC
#ifdef DEBUG_MIGRATION_EXEC
#define dprintf(fmt, ...) \
do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
static int file_errno(FdMigrationState *s)
{
return errno;
}
static int file_write(FdMigrationState *s, const void * buf, size_t size)
{
return write(s->fd, buf, size);
}
static int exec_close(FdMigrationState *s)
{
dprintf("exec_close\n");
if (s->opaque) {
qemu_fclose(s->opaque);
s->opaque = NULL;
s->fd = -1;
}
return 0;
}
MigrationState *exec_start_outgoing_migration(Monitor *mon,
const char *command,
int64_t bandwidth_limit,
int detach,
int blk,
int inc)
{
FdMigrationState *s;
FILE *f;
s = qemu_mallocz(sizeof(*s));
f = popen(command, "w");
if (f == NULL) {
dprintf("Unable to popen exec target\n");
goto err_after_alloc;
}
s->fd = fileno(f);
if (s->fd == -1) {
dprintf("Unable to retrieve file descriptor for popen'd handle\n");
goto err_after_open;
}
socket_set_nonblock(s->fd);
s->opaque = qemu_popen(f, "w");
s->close = exec_close;
s->get_error = file_errno;
s->write = file_write;
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:
pclose(f);
err_after_alloc:
qemu_free(s);
return NULL;
}
static void exec_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 exec_start_incoming_migration(const char *command)
{
QEMUFile *f;
dprintf("Attempting to start an incoming migration\n");
f = qemu_popen_cmd(command, "r");
if(f == NULL) {
dprintf("Unable to apply qemu wrapper to popen file\n");
return -errno;
}
qemu_set_fd_handler2(qemu_stdio_fd(f), NULL,
exec_accept_incoming_migration, NULL,
(void *)(unsigned long)f);
return 0;
}