diff options
Diffstat (limited to 'savevm.c')
| -rw-r--r-- | savevm.c | 115 |
1 files changed, 75 insertions, 40 deletions
@@ -1018,6 +1018,7 @@ typedef struct SaveStateEntry { const VMStateDescription *vmsd; void *opaque; CompatEntry *compat; + int no_migrate; } SaveStateEntry; @@ -1081,6 +1082,7 @@ int register_savevm_live(DeviceState *dev, se->load_state = load_state; se->opaque = opaque; se->vmsd = NULL; + se->no_migrate = 0; if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) { char *id = dev->parent_bus->info->get_dev_path(dev); @@ -1147,6 +1149,31 @@ void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque) } } +/* mark a device as not to be migrated, that is the device should be + unplugged before migration */ +void register_device_unmigratable(DeviceState *dev, const char *idstr, + void *opaque) +{ + SaveStateEntry *se; + char id[256] = ""; + + if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) { + char *path = dev->parent_bus->info->get_dev_path(dev); + if (path) { + pstrcpy(id, sizeof(id), path); + pstrcat(id, sizeof(id), "/"); + qemu_free(path); + } + } + pstrcat(id, sizeof(id), idstr); + + QTAILQ_FOREACH(se, &savevm_handlers, entry) { + if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) { + se->no_migrate = 1; + } + } +} + int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, const VMStateDescription *vmsd, void *opaque, int alias_id, @@ -1353,13 +1380,19 @@ static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id) return vmstate_load_state(f, se->vmsd, se->opaque, version_id); } -static void vmstate_save(QEMUFile *f, SaveStateEntry *se) +static int vmstate_save(QEMUFile *f, SaveStateEntry *se) { + if (se->no_migrate) { + return -1; + } + if (!se->vmsd) { /* Old style */ se->save_state(f, se->opaque); - return; + return 0; } vmstate_save_state(f,se->vmsd, se->opaque); + + return 0; } #define QEMU_VM_FILE_MAGIC 0x5145564d @@ -1454,6 +1487,7 @@ int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f) int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f) { SaveStateEntry *se; + int r; cpu_synchronize_all_states(); @@ -1486,7 +1520,11 @@ int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f) qemu_put_be32(f, se->instance_id); qemu_put_be32(f, se->version_id); - vmstate_save(f, se); + r = vmstate_save(f, se); + if (r < 0) { + monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr); + return r; + } } qemu_put_byte(f, QEMU_VM_EOF); @@ -1894,12 +1932,27 @@ void do_savevm(Monitor *mon, const QDict *qdict) int load_vmstate(const char *name) { - BlockDriverState *bs, *bs1; + BlockDriverState *bs, *bs_vm_state; QEMUSnapshotInfo sn; QEMUFile *f; int ret; - /* Verify if there is a device that doesn't support snapshots and is writable */ + bs_vm_state = bdrv_snapshots(); + if (!bs_vm_state) { + error_report("No block device supports snapshots"); + return -ENOTSUP; + } + + /* Don't even try to load empty VM states */ + ret = bdrv_snapshot_find(bs_vm_state, &sn, name); + if (ret < 0) { + return ret; + } else if (sn.vm_state_size == 0) { + return -EINVAL; + } + + /* Verify if there is any device that doesn't support snapshots and is + writable and check if the requested snapshot is available too. */ bs = NULL; while ((bs = bdrv_next(bs))) { @@ -1912,63 +1965,45 @@ int load_vmstate(const char *name) bdrv_get_device_name(bs)); return -ENOTSUP; } - } - bs = bdrv_snapshots(); - if (!bs) { - error_report("No block device supports snapshots"); - return -EINVAL; + ret = bdrv_snapshot_find(bs, &sn, name); + if (ret < 0) { + error_report("Device '%s' does not have the requested snapshot '%s'", + bdrv_get_device_name(bs), name); + return ret; + } } /* Flush all IO requests so they don't interfere with the new state. */ qemu_aio_flush(); - bs1 = NULL; - while ((bs1 = bdrv_next(bs1))) { - if (bdrv_can_snapshot(bs1)) { - ret = bdrv_snapshot_goto(bs1, name); + bs = NULL; + while ((bs = bdrv_next(bs))) { + if (bdrv_can_snapshot(bs)) { + ret = bdrv_snapshot_goto(bs, name); if (ret < 0) { - switch(ret) { - case -ENOTSUP: - error_report("%sSnapshots not supported on device '%s'", - bs != bs1 ? "Warning: " : "", - bdrv_get_device_name(bs1)); - break; - case -ENOENT: - error_report("%sCould not find snapshot '%s' on device '%s'", - bs != bs1 ? "Warning: " : "", - name, bdrv_get_device_name(bs1)); - break; - default: - error_report("%sError %d while activating snapshot on '%s'", - bs != bs1 ? "Warning: " : "", - ret, bdrv_get_device_name(bs1)); - break; - } - /* fatal on snapshot block device */ - if (bs == bs1) - return 0; + error_report("Error %d while activating snapshot '%s' on '%s'", + ret, name, bdrv_get_device_name(bs)); + return ret; } } } - /* Don't even try to load empty VM states */ - ret = bdrv_snapshot_find(bs, &sn, name); - if ((ret >= 0) && (sn.vm_state_size == 0)) - return -EINVAL; - /* restore the VM state */ - f = qemu_fopen_bdrv(bs, 0); + f = qemu_fopen_bdrv(bs_vm_state, 0); if (!f) { error_report("Could not open VM state file"); return -EINVAL; } + ret = qemu_loadvm_state(f); + qemu_fclose(f); if (ret < 0) { error_report("Error %d while loading VM state", ret); return ret; } + return 0; } |