char idstr[256];
int instance_id;
int version_id;
+ int section_id;
+ SaveLiveStateHandler *save_live_state;
SaveStateHandler *save_state;
LoadStateHandler *load_state;
void *opaque;
of the system, so instance_id should be removed/replaced.
Meanwhile pass -1 as instance_id if you do not already have a clearly
distinguishing id for all instances of your device class. */
-int register_savevm(const char *idstr,
- int instance_id,
- int version_id,
- SaveStateHandler *save_state,
- LoadStateHandler *load_state,
- void *opaque)
+int register_savevm_live(const char *idstr,
+ int instance_id,
+ int version_id,
+ SaveLiveStateHandler *save_live_state,
+ SaveStateHandler *save_state,
+ LoadStateHandler *load_state,
+ void *opaque)
{
SaveStateEntry *se, **pse;
+ static int global_section_id;
se = qemu_malloc(sizeof(SaveStateEntry));
if (!se)
pstrcpy(se->idstr, sizeof(se->idstr), idstr);
se->instance_id = (instance_id == -1) ? 0 : instance_id;
se->version_id = version_id;
+ se->section_id = global_section_id++;
+ se->save_live_state = save_live_state;
se->save_state = save_state;
se->load_state = load_state;
se->opaque = opaque;
return 0;
}
-#define QEMU_VM_FILE_MAGIC 0x5145564d
-#define QEMU_VM_FILE_VERSION 0x00000002
+int register_savevm(const char *idstr,
+ int instance_id,
+ int version_id,
+ SaveStateHandler *save_state,
+ LoadStateHandler *load_state,
+ void *opaque)
+{
+ return register_savevm_live(idstr, instance_id, version_id,
+ NULL, save_state, load_state, opaque);
+}
+
+#define QEMU_VM_FILE_MAGIC 0x5145564d
+#define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
+#define QEMU_VM_FILE_VERSION 0x00000003
-static int qemu_savevm_state(QEMUFile *f)
+#define QEMU_VM_EOF 0x00
+#define QEMU_VM_SECTION_START 0x01
+#define QEMU_VM_SECTION_PART 0x02
+#define QEMU_VM_SECTION_END 0x03
+#define QEMU_VM_SECTION_FULL 0x04
+
+int qemu_savevm_state_begin(QEMUFile *f)
{
SaveStateEntry *se;
- int len, ret;
- int64_t cur_pos, len_pos, total_len_pos;
qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
qemu_put_be32(f, QEMU_VM_FILE_VERSION);
- total_len_pos = qemu_ftell(f);
- qemu_put_be64(f, 0); /* total size */
+
+ for (se = first_se; se != NULL; se = se->next) {
+ int len;
+
+ if (se->save_live_state == NULL)
+ continue;
+
+ /* Section type */
+ qemu_put_byte(f, QEMU_VM_SECTION_START);
+ qemu_put_be32(f, se->section_id);
+
+ /* ID string */
+ len = strlen(se->idstr);
+ qemu_put_byte(f, len);
+ qemu_put_buffer(f, (uint8_t *)se->idstr, len);
+
+ qemu_put_be32(f, se->instance_id);
+ qemu_put_be32(f, se->version_id);
+
+ se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
+ }
+
+ return 0;
+}
+
+int qemu_savevm_state_iterate(QEMUFile *f)
+{
+ SaveStateEntry *se;
+ int ret = 0;
+
+ for (se = first_se; se != NULL; se = se->next) {
+ if (se->save_live_state == NULL)
+ continue;
+
+ /* Section type */
+ qemu_put_byte(f, QEMU_VM_SECTION_PART);
+ qemu_put_be32(f, se->section_id);
+
+ ret |= se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
+ }
+
+ if (ret)
+ return 1;
+
+ return 0;
+}
+
+int qemu_savevm_state_complete(QEMUFile *f)
+{
+ SaveStateEntry *se;
+
+ for (se = first_se; se != NULL; se = se->next) {
+ if (se->save_live_state == NULL)
+ continue;
+
+ /* Section type */
+ qemu_put_byte(f, QEMU_VM_SECTION_END);
+ qemu_put_be32(f, se->section_id);
+
+ se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
+ }
for(se = first_se; se != NULL; se = se->next) {
+ int len;
+
if (se->save_state == NULL)
- /* this one has a loader only, for backwards compatibility */
continue;
+ /* Section type */
+ qemu_put_byte(f, QEMU_VM_SECTION_FULL);
+ qemu_put_be32(f, se->section_id);
+
/* ID string */
len = strlen(se->idstr);
qemu_put_byte(f, len);
qemu_put_be32(f, se->instance_id);
qemu_put_be32(f, se->version_id);
- /* record size: filled later */
- len_pos = qemu_ftell(f);
- qemu_put_be32(f, 0);
se->save_state(f, se->opaque);
-
- /* fill record size */
- cur_pos = qemu_ftell(f);
- len = cur_pos - len_pos - 4;
- qemu_fseek(f, len_pos, SEEK_SET);
- qemu_put_be32(f, len);
- qemu_fseek(f, cur_pos, SEEK_SET);
}
- cur_pos = qemu_ftell(f);
- qemu_fseek(f, total_len_pos, SEEK_SET);
- qemu_put_be64(f, cur_pos - total_len_pos - 8);
- qemu_fseek(f, cur_pos, SEEK_SET);
- ret = 0;
+ qemu_put_byte(f, QEMU_VM_EOF);
+
+ return 0;
+}
+
+int qemu_savevm_state(QEMUFile *f)
+{
+ int saved_vm_running;
+ int ret;
+
+ saved_vm_running = vm_running;
+ vm_stop(0);
+
+ ret = qemu_savevm_state_begin(f);
+ if (ret < 0)
+ goto out;
+
+ do {
+ ret = qemu_savevm_state_iterate(f);
+ if (ret < 0)
+ goto out;
+ } while (ret == 1);
+
+ ret = qemu_savevm_state_complete(f);
+
+out:
+ if (saved_vm_running)
+ vm_start();
return ret;
}
return NULL;
}
-static int qemu_loadvm_state(QEMUFile *f)
+typedef struct LoadStateEntry {
+ SaveStateEntry *se;
+ int section_id;
+ int version_id;
+ struct LoadStateEntry *next;
+} LoadStateEntry;
+
+static int qemu_loadvm_state_v2(QEMUFile *f)
{
SaveStateEntry *se;
int len, ret, instance_id, record_len, version_id;
int64_t total_len, end_pos, cur_pos;
- unsigned int v;
char idstr[256];
- v = qemu_get_be32(f);
- if (v != QEMU_VM_FILE_MAGIC)
- goto fail;
- v = qemu_get_be32(f);
- if (v != QEMU_VM_FILE_VERSION) {
- fail:
- ret = -1;
- goto the_end;
- }
total_len = qemu_get_be64(f);
end_pos = total_len + qemu_ftell(f);
for(;;) {
instance_id = qemu_get_be32(f);
version_id = qemu_get_be32(f);
record_len = qemu_get_be32(f);
-#if 0
- printf("idstr=%s instance=0x%x version=%d len=%d\n",
- idstr, instance_id, version_id, record_len);
-#endif
cur_pos = qemu_ftell(f);
se = find_se(idstr, instance_id);
if (!se) {
/* always seek to exact end of record */
qemu_fseek(f, cur_pos + record_len, SEEK_SET);
}
+ return 0;
+}
+
+int qemu_loadvm_state(QEMUFile *f)
+{
+ LoadStateEntry *first_le = NULL;
+ uint8_t section_type;
+ unsigned int v;
+ int ret;
+
+ v = qemu_get_be32(f);
+ if (v != QEMU_VM_FILE_MAGIC)
+ return -EINVAL;
+
+ v = qemu_get_be32(f);
+ if (v == QEMU_VM_FILE_VERSION_COMPAT)
+ return qemu_loadvm_state_v2(f);
+ if (v != QEMU_VM_FILE_VERSION)
+ return -ENOTSUP;
+
+ while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
+ uint32_t instance_id, version_id, section_id;
+ LoadStateEntry *le;
+ SaveStateEntry *se;
+ char idstr[257];
+ int len;
+
+ switch (section_type) {
+ case QEMU_VM_SECTION_START:
+ case QEMU_VM_SECTION_FULL:
+ /* Read section start */
+ section_id = qemu_get_be32(f);
+ len = qemu_get_byte(f);
+ qemu_get_buffer(f, (uint8_t *)idstr, len);
+ idstr[len] = 0;
+ instance_id = qemu_get_be32(f);
+ version_id = qemu_get_be32(f);
+
+ /* Find savevm section */
+ se = find_se(idstr, instance_id);
+ if (se == NULL) {
+ fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Validate version */
+ if (version_id > se->version_id) {
+ fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
+ version_id, idstr, se->version_id);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Add entry */
+ le = qemu_mallocz(sizeof(*le));
+ if (le == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ le->se = se;
+ le->section_id = section_id;
+ le->version_id = version_id;
+ le->next = first_le;
+ first_le = le;
+
+ le->se->load_state(f, le->se->opaque, le->version_id);
+ break;
+ case QEMU_VM_SECTION_PART:
+ case QEMU_VM_SECTION_END:
+ section_id = qemu_get_be32(f);
+
+ for (le = first_le; le && le->section_id != section_id; le = le->next);
+ if (le == NULL) {
+ fprintf(stderr, "Unknown savevm section %d\n", section_id);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ le->se->load_state(f, le->se->opaque, le->version_id);
+ break;
+ default:
+ fprintf(stderr, "Unknown savevm section type %d\n", section_type);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
ret = 0;
- the_end:
+
+out:
+ while (first_le) {
+ LoadStateEntry *le = first_le;
+ first_le = first_le->next;
+ qemu_free(le);
+ }
+
return ret;
}
projects / qemu.git / commitdiff