When trying to do detached migration with exec, I found that the monitor wouldn't always return in a timely manner. I tracked this down to exec_start_outgoing_migration. It appeared we were setting the fd to NONBLOCK'ing, but in point of fact we weren't. This bugfix should also go onto the stable 0.10 branch Signed-off-by: Chris Lalancette <clalance@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
142 lines
3.1 KiB
C
142 lines
3.1 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(const char *command,
|
|
int64_t bandwidth_limit,
|
|
int detach)
|
|
{
|
|
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->state = MIG_STATE_ACTIVE;
|
|
s->mon_resume = NULL;
|
|
s->bandwidth_limit = bandwidth_limit;
|
|
|
|
if (!detach)
|
|
migrate_fd_monitor_suspend(s);
|
|
|
|
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_popen_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_popen_fd(f), NULL,
|
|
exec_accept_incoming_migration, NULL,
|
|
(void *)(unsigned long)f);
|
|
|
|
return 0;
|
|
}
|