/* * 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; }