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Support marking a device as non-migratable 

A non-migratable device should be removed before migration and re-added after.

Signed-off-by: Cam Macdonell <cam@cs.ualberta.ca>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Cam Macdonell 2010-07-26 18:11:00 -06:00 committed by Anthony Liguori
parent 44f1a3d876
commit 2431296806
2 changed files with 43 additions and 3 deletions
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2
hw/hw.h
View File

@ -264,6 +264,8 @@ int register_savevm_live(DeviceState *dev,
void *opaque);
void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque);
void register_device_unmigratable(DeviceState *dev, const char *idstr,
void *opaque);
typedef void QEMUResetHandler(void *opaque);

44
savevm.c
View File

@ -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);