mirror of https://gitee.com/openkylin/qemu.git
144 lines
3.1 KiB
C
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;
|
|
}
|