xref: /openbmc/qemu/migration/vmstate-types.c (revision f3635813)
1 /*
2  * VMStateInfo's for basic typse
3  *
4  * Copyright (c) 2009-2017 Red Hat Inc
5  *
6  * Authors:
7  *  Juan Quintela <quintela@redhat.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
10  * See the COPYING file in the top-level directory.
11  */
12 
13 #include "qemu/osdep.h"
14 #include "qemu-file.h"
15 #include "migration.h"
16 #include "migration/vmstate.h"
17 #include "qemu/error-report.h"
18 #include "qemu/queue.h"
19 #include "trace.h"
20 
21 /* bool */
22 
23 static int get_bool(QEMUFile *f, void *pv, size_t size,
24                     const VMStateField *field)
25 {
26     bool *v = pv;
27     *v = qemu_get_byte(f);
28     return 0;
29 }
30 
31 static int put_bool(QEMUFile *f, void *pv, size_t size,
32                     const VMStateField *field, QJSON *vmdesc)
33 {
34     bool *v = pv;
35     qemu_put_byte(f, *v);
36     return 0;
37 }
38 
39 const VMStateInfo vmstate_info_bool = {
40     .name = "bool",
41     .get  = get_bool,
42     .put  = put_bool,
43 };
44 
45 /* 8 bit int */
46 
47 static int get_int8(QEMUFile *f, void *pv, size_t size,
48                     const VMStateField *field)
49 {
50     int8_t *v = pv;
51     qemu_get_s8s(f, v);
52     return 0;
53 }
54 
55 static int put_int8(QEMUFile *f, void *pv, size_t size,
56                     const VMStateField *field, QJSON *vmdesc)
57 {
58     int8_t *v = pv;
59     qemu_put_s8s(f, v);
60     return 0;
61 }
62 
63 const VMStateInfo vmstate_info_int8 = {
64     .name = "int8",
65     .get  = get_int8,
66     .put  = put_int8,
67 };
68 
69 /* 16 bit int */
70 
71 static int get_int16(QEMUFile *f, void *pv, size_t size,
72                      const VMStateField *field)
73 {
74     int16_t *v = pv;
75     qemu_get_sbe16s(f, v);
76     return 0;
77 }
78 
79 static int put_int16(QEMUFile *f, void *pv, size_t size,
80                      const VMStateField *field, QJSON *vmdesc)
81 {
82     int16_t *v = pv;
83     qemu_put_sbe16s(f, v);
84     return 0;
85 }
86 
87 const VMStateInfo vmstate_info_int16 = {
88     .name = "int16",
89     .get  = get_int16,
90     .put  = put_int16,
91 };
92 
93 /* 32 bit int */
94 
95 static int get_int32(QEMUFile *f, void *pv, size_t size,
96                      const VMStateField *field)
97 {
98     int32_t *v = pv;
99     qemu_get_sbe32s(f, v);
100     return 0;
101 }
102 
103 static int put_int32(QEMUFile *f, void *pv, size_t size,
104                      const VMStateField *field, QJSON *vmdesc)
105 {
106     int32_t *v = pv;
107     qemu_put_sbe32s(f, v);
108     return 0;
109 }
110 
111 const VMStateInfo vmstate_info_int32 = {
112     .name = "int32",
113     .get  = get_int32,
114     .put  = put_int32,
115 };
116 
117 /* 32 bit int. See that the received value is the same than the one
118    in the field */
119 
120 static int get_int32_equal(QEMUFile *f, void *pv, size_t size,
121                            const VMStateField *field)
122 {
123     int32_t *v = pv;
124     int32_t v2;
125     qemu_get_sbe32s(f, &v2);
126 
127     if (*v == v2) {
128         return 0;
129     }
130     error_report("%" PRIx32 " != %" PRIx32, *v, v2);
131     if (field->err_hint) {
132         error_printf("%s\n", field->err_hint);
133     }
134     return -EINVAL;
135 }
136 
137 const VMStateInfo vmstate_info_int32_equal = {
138     .name = "int32 equal",
139     .get  = get_int32_equal,
140     .put  = put_int32,
141 };
142 
143 /* 32 bit int. Check that the received value is non-negative
144  * and less than or equal to the one in the field.
145  */
146 
147 static int get_int32_le(QEMUFile *f, void *pv, size_t size,
148                         const VMStateField *field)
149 {
150     int32_t *cur = pv;
151     int32_t loaded;
152     qemu_get_sbe32s(f, &loaded);
153 
154     if (loaded >= 0 && loaded <= *cur) {
155         *cur = loaded;
156         return 0;
157     }
158     error_report("Invalid value %" PRId32
159                  " expecting positive value <= %" PRId32,
160                  loaded, *cur);
161     return -EINVAL;
162 }
163 
164 const VMStateInfo vmstate_info_int32_le = {
165     .name = "int32 le",
166     .get  = get_int32_le,
167     .put  = put_int32,
168 };
169 
170 /* 64 bit int */
171 
172 static int get_int64(QEMUFile *f, void *pv, size_t size,
173                      const VMStateField *field)
174 {
175     int64_t *v = pv;
176     qemu_get_sbe64s(f, v);
177     return 0;
178 }
179 
180 static int put_int64(QEMUFile *f, void *pv, size_t size,
181                      const VMStateField *field, QJSON *vmdesc)
182 {
183     int64_t *v = pv;
184     qemu_put_sbe64s(f, v);
185     return 0;
186 }
187 
188 const VMStateInfo vmstate_info_int64 = {
189     .name = "int64",
190     .get  = get_int64,
191     .put  = put_int64,
192 };
193 
194 /* 8 bit unsigned int */
195 
196 static int get_uint8(QEMUFile *f, void *pv, size_t size,
197                      const VMStateField *field)
198 {
199     uint8_t *v = pv;
200     qemu_get_8s(f, v);
201     return 0;
202 }
203 
204 static int put_uint8(QEMUFile *f, void *pv, size_t size,
205                      const VMStateField *field, QJSON *vmdesc)
206 {
207     uint8_t *v = pv;
208     qemu_put_8s(f, v);
209     return 0;
210 }
211 
212 const VMStateInfo vmstate_info_uint8 = {
213     .name = "uint8",
214     .get  = get_uint8,
215     .put  = put_uint8,
216 };
217 
218 /* 16 bit unsigned int */
219 
220 static int get_uint16(QEMUFile *f, void *pv, size_t size,
221                       const VMStateField *field)
222 {
223     uint16_t *v = pv;
224     qemu_get_be16s(f, v);
225     return 0;
226 }
227 
228 static int put_uint16(QEMUFile *f, void *pv, size_t size,
229                       const VMStateField *field, QJSON *vmdesc)
230 {
231     uint16_t *v = pv;
232     qemu_put_be16s(f, v);
233     return 0;
234 }
235 
236 const VMStateInfo vmstate_info_uint16 = {
237     .name = "uint16",
238     .get  = get_uint16,
239     .put  = put_uint16,
240 };
241 
242 /* 32 bit unsigned int */
243 
244 static int get_uint32(QEMUFile *f, void *pv, size_t size,
245                       const VMStateField *field)
246 {
247     uint32_t *v = pv;
248     qemu_get_be32s(f, v);
249     return 0;
250 }
251 
252 static int put_uint32(QEMUFile *f, void *pv, size_t size,
253                       const VMStateField *field, QJSON *vmdesc)
254 {
255     uint32_t *v = pv;
256     qemu_put_be32s(f, v);
257     return 0;
258 }
259 
260 const VMStateInfo vmstate_info_uint32 = {
261     .name = "uint32",
262     .get  = get_uint32,
263     .put  = put_uint32,
264 };
265 
266 /* 32 bit uint. See that the received value is the same than the one
267    in the field */
268 
269 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size,
270                             const VMStateField *field)
271 {
272     uint32_t *v = pv;
273     uint32_t v2;
274     qemu_get_be32s(f, &v2);
275 
276     if (*v == v2) {
277         return 0;
278     }
279     error_report("%" PRIx32 " != %" PRIx32, *v, v2);
280     if (field->err_hint) {
281         error_printf("%s\n", field->err_hint);
282     }
283     return -EINVAL;
284 }
285 
286 const VMStateInfo vmstate_info_uint32_equal = {
287     .name = "uint32 equal",
288     .get  = get_uint32_equal,
289     .put  = put_uint32,
290 };
291 
292 /* 64 bit unsigned int */
293 
294 static int get_uint64(QEMUFile *f, void *pv, size_t size,
295                       const VMStateField *field)
296 {
297     uint64_t *v = pv;
298     qemu_get_be64s(f, v);
299     return 0;
300 }
301 
302 static int put_uint64(QEMUFile *f, void *pv, size_t size,
303                       const VMStateField *field, QJSON *vmdesc)
304 {
305     uint64_t *v = pv;
306     qemu_put_be64s(f, v);
307     return 0;
308 }
309 
310 const VMStateInfo vmstate_info_uint64 = {
311     .name = "uint64",
312     .get  = get_uint64,
313     .put  = put_uint64,
314 };
315 
316 static int get_nullptr(QEMUFile *f, void *pv, size_t size,
317                        const VMStateField *field)
318 
319 {
320     if (qemu_get_byte(f) == VMS_NULLPTR_MARKER) {
321         return  0;
322     }
323     error_report("vmstate: get_nullptr expected VMS_NULLPTR_MARKER");
324     return -EINVAL;
325 }
326 
327 static int put_nullptr(QEMUFile *f, void *pv, size_t size,
328                         const VMStateField *field, QJSON *vmdesc)
329 
330 {
331     if (pv == NULL) {
332         qemu_put_byte(f, VMS_NULLPTR_MARKER);
333         return 0;
334     }
335     error_report("vmstate: put_nullptr must be called with pv == NULL");
336     return -EINVAL;
337 }
338 
339 const VMStateInfo vmstate_info_nullptr = {
340     .name = "uint64",
341     .get  = get_nullptr,
342     .put  = put_nullptr,
343 };
344 
345 /* 64 bit unsigned int. See that the received value is the same than the one
346    in the field */
347 
348 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size,
349                             const VMStateField *field)
350 {
351     uint64_t *v = pv;
352     uint64_t v2;
353     qemu_get_be64s(f, &v2);
354 
355     if (*v == v2) {
356         return 0;
357     }
358     error_report("%" PRIx64 " != %" PRIx64, *v, v2);
359     if (field->err_hint) {
360         error_printf("%s\n", field->err_hint);
361     }
362     return -EINVAL;
363 }
364 
365 const VMStateInfo vmstate_info_uint64_equal = {
366     .name = "int64 equal",
367     .get  = get_uint64_equal,
368     .put  = put_uint64,
369 };
370 
371 /* 8 bit int. See that the received value is the same than the one
372    in the field */
373 
374 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size,
375                            const VMStateField *field)
376 {
377     uint8_t *v = pv;
378     uint8_t v2;
379     qemu_get_8s(f, &v2);
380 
381     if (*v == v2) {
382         return 0;
383     }
384     error_report("%x != %x", *v, v2);
385     if (field->err_hint) {
386         error_printf("%s\n", field->err_hint);
387     }
388     return -EINVAL;
389 }
390 
391 const VMStateInfo vmstate_info_uint8_equal = {
392     .name = "uint8 equal",
393     .get  = get_uint8_equal,
394     .put  = put_uint8,
395 };
396 
397 /* 16 bit unsigned int int. See that the received value is the same than the one
398    in the field */
399 
400 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size,
401                             const VMStateField *field)
402 {
403     uint16_t *v = pv;
404     uint16_t v2;
405     qemu_get_be16s(f, &v2);
406 
407     if (*v == v2) {
408         return 0;
409     }
410     error_report("%x != %x", *v, v2);
411     if (field->err_hint) {
412         error_printf("%s\n", field->err_hint);
413     }
414     return -EINVAL;
415 }
416 
417 const VMStateInfo vmstate_info_uint16_equal = {
418     .name = "uint16 equal",
419     .get  = get_uint16_equal,
420     .put  = put_uint16,
421 };
422 
423 /* floating point */
424 
425 static int get_float64(QEMUFile *f, void *pv, size_t size,
426                        const VMStateField *field)
427 {
428     float64 *v = pv;
429 
430     *v = make_float64(qemu_get_be64(f));
431     return 0;
432 }
433 
434 static int put_float64(QEMUFile *f, void *pv, size_t size,
435                        const VMStateField *field, QJSON *vmdesc)
436 {
437     uint64_t *v = pv;
438 
439     qemu_put_be64(f, float64_val(*v));
440     return 0;
441 }
442 
443 const VMStateInfo vmstate_info_float64 = {
444     .name = "float64",
445     .get  = get_float64,
446     .put  = put_float64,
447 };
448 
449 /* CPU_DoubleU type */
450 
451 static int get_cpudouble(QEMUFile *f, void *pv, size_t size,
452                          const VMStateField *field)
453 {
454     CPU_DoubleU *v = pv;
455     qemu_get_be32s(f, &v->l.upper);
456     qemu_get_be32s(f, &v->l.lower);
457     return 0;
458 }
459 
460 static int put_cpudouble(QEMUFile *f, void *pv, size_t size,
461                          const VMStateField *field, QJSON *vmdesc)
462 {
463     CPU_DoubleU *v = pv;
464     qemu_put_be32s(f, &v->l.upper);
465     qemu_put_be32s(f, &v->l.lower);
466     return 0;
467 }
468 
469 const VMStateInfo vmstate_info_cpudouble = {
470     .name = "CPU_Double_U",
471     .get  = get_cpudouble,
472     .put  = put_cpudouble,
473 };
474 
475 /* uint8_t buffers */
476 
477 static int get_buffer(QEMUFile *f, void *pv, size_t size,
478                       const VMStateField *field)
479 {
480     uint8_t *v = pv;
481     qemu_get_buffer(f, v, size);
482     return 0;
483 }
484 
485 static int put_buffer(QEMUFile *f, void *pv, size_t size,
486                       const VMStateField *field, QJSON *vmdesc)
487 {
488     uint8_t *v = pv;
489     qemu_put_buffer(f, v, size);
490     return 0;
491 }
492 
493 const VMStateInfo vmstate_info_buffer = {
494     .name = "buffer",
495     .get  = get_buffer,
496     .put  = put_buffer,
497 };
498 
499 /* unused buffers: space that was used for some fields that are
500    not useful anymore */
501 
502 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size,
503                              const VMStateField *field)
504 {
505     uint8_t buf[1024];
506     int block_len;
507 
508     while (size > 0) {
509         block_len = MIN(sizeof(buf), size);
510         size -= block_len;
511         qemu_get_buffer(f, buf, block_len);
512     }
513    return 0;
514 }
515 
516 static int put_unused_buffer(QEMUFile *f, void *pv, size_t size,
517                              const VMStateField *field, QJSON *vmdesc)
518 {
519     static const uint8_t buf[1024];
520     int block_len;
521 
522     while (size > 0) {
523         block_len = MIN(sizeof(buf), size);
524         size -= block_len;
525         qemu_put_buffer(f, buf, block_len);
526     }
527 
528     return 0;
529 }
530 
531 const VMStateInfo vmstate_info_unused_buffer = {
532     .name = "unused_buffer",
533     .get  = get_unused_buffer,
534     .put  = put_unused_buffer,
535 };
536 
537 /* vmstate_info_tmp, see VMSTATE_WITH_TMP, the idea is that we allocate
538  * a temporary buffer and the pre_load/pre_save methods in the child vmsd
539  * copy stuff from the parent into the child and do calculations to fill
540  * in fields that don't really exist in the parent but need to be in the
541  * stream.
542  */
543 static int get_tmp(QEMUFile *f, void *pv, size_t size,
544                    const VMStateField *field)
545 {
546     int ret;
547     const VMStateDescription *vmsd = field->vmsd;
548     int version_id = field->version_id;
549     void *tmp = g_malloc(size);
550 
551     /* Writes the parent field which is at the start of the tmp */
552     *(void **)tmp = pv;
553     ret = vmstate_load_state(f, vmsd, tmp, version_id);
554     g_free(tmp);
555     return ret;
556 }
557 
558 static int put_tmp(QEMUFile *f, void *pv, size_t size,
559                    const VMStateField *field, QJSON *vmdesc)
560 {
561     const VMStateDescription *vmsd = field->vmsd;
562     void *tmp = g_malloc(size);
563     int ret;
564 
565     /* Writes the parent field which is at the start of the tmp */
566     *(void **)tmp = pv;
567     ret = vmstate_save_state(f, vmsd, tmp, vmdesc);
568     g_free(tmp);
569 
570     return ret;
571 }
572 
573 const VMStateInfo vmstate_info_tmp = {
574     .name = "tmp",
575     .get = get_tmp,
576     .put = put_tmp,
577 };
578 
579 /* bitmaps (as defined by bitmap.h). Note that size here is the size
580  * of the bitmap in bits. The on-the-wire format of a bitmap is 64
581  * bit words with the bits in big endian order. The in-memory format
582  * is an array of 'unsigned long', which may be either 32 or 64 bits.
583  */
584 /* This is the number of 64 bit words sent over the wire */
585 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
586 static int get_bitmap(QEMUFile *f, void *pv, size_t size,
587                       const VMStateField *field)
588 {
589     unsigned long *bmp = pv;
590     int i, idx = 0;
591     for (i = 0; i < BITS_TO_U64S(size); i++) {
592         uint64_t w = qemu_get_be64(f);
593         bmp[idx++] = w;
594         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
595             bmp[idx++] = w >> 32;
596         }
597     }
598     return 0;
599 }
600 
601 static int put_bitmap(QEMUFile *f, void *pv, size_t size,
602                       const VMStateField *field, QJSON *vmdesc)
603 {
604     unsigned long *bmp = pv;
605     int i, idx = 0;
606     for (i = 0; i < BITS_TO_U64S(size); i++) {
607         uint64_t w = bmp[idx++];
608         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
609             w |= ((uint64_t)bmp[idx++]) << 32;
610         }
611         qemu_put_be64(f, w);
612     }
613 
614     return 0;
615 }
616 
617 const VMStateInfo vmstate_info_bitmap = {
618     .name = "bitmap",
619     .get = get_bitmap,
620     .put = put_bitmap,
621 };
622 
623 /* get for QTAILQ
624  * meta data about the QTAILQ is encoded in a VMStateField structure
625  */
626 static int get_qtailq(QEMUFile *f, void *pv, size_t unused_size,
627                       const VMStateField *field)
628 {
629     int ret = 0;
630     const VMStateDescription *vmsd = field->vmsd;
631     /* size of a QTAILQ element */
632     size_t size = field->size;
633     /* offset of the QTAILQ entry in a QTAILQ element */
634     size_t entry_offset = field->start;
635     int version_id = field->version_id;
636     void *elm;
637 
638     trace_get_qtailq(vmsd->name, version_id);
639     if (version_id > vmsd->version_id) {
640         error_report("%s %s",  vmsd->name, "too new");
641         trace_get_qtailq_end(vmsd->name, "too new", -EINVAL);
642 
643         return -EINVAL;
644     }
645     if (version_id < vmsd->minimum_version_id) {
646         error_report("%s %s",  vmsd->name, "too old");
647         trace_get_qtailq_end(vmsd->name, "too old", -EINVAL);
648         return -EINVAL;
649     }
650 
651     while (qemu_get_byte(f)) {
652         elm = g_malloc(size);
653         ret = vmstate_load_state(f, vmsd, elm, version_id);
654         if (ret) {
655             return ret;
656         }
657         QTAILQ_RAW_INSERT_TAIL(pv, elm, entry_offset);
658     }
659 
660     trace_get_qtailq_end(vmsd->name, "end", ret);
661     return ret;
662 }
663 
664 /* put for QTAILQ */
665 static int put_qtailq(QEMUFile *f, void *pv, size_t unused_size,
666                       const VMStateField *field, QJSON *vmdesc)
667 {
668     const VMStateDescription *vmsd = field->vmsd;
669     /* offset of the QTAILQ entry in a QTAILQ element*/
670     size_t entry_offset = field->start;
671     void *elm;
672     int ret;
673 
674     trace_put_qtailq(vmsd->name, vmsd->version_id);
675 
676     QTAILQ_RAW_FOREACH(elm, pv, entry_offset) {
677         qemu_put_byte(f, true);
678         ret = vmstate_save_state(f, vmsd, elm, vmdesc);
679         if (ret) {
680             return ret;
681         }
682     }
683     qemu_put_byte(f, false);
684 
685     trace_put_qtailq_end(vmsd->name, "end");
686 
687     return 0;
688 }
689 const VMStateInfo vmstate_info_qtailq = {
690     .name = "qtailq",
691     .get  = get_qtailq,
692     .put  = put_qtailq,
693 };
694 
695 struct put_gtree_data {
696     QEMUFile *f;
697     const VMStateDescription *key_vmsd;
698     const VMStateDescription *val_vmsd;
699     QJSON *vmdesc;
700     int ret;
701 };
702 
703 static gboolean put_gtree_elem(gpointer key, gpointer value, gpointer data)
704 {
705     struct put_gtree_data *capsule = (struct put_gtree_data *)data;
706     QEMUFile *f = capsule->f;
707     int ret;
708 
709     qemu_put_byte(f, true);
710 
711     /* put the key */
712     if (!capsule->key_vmsd) {
713         qemu_put_be64(f, (uint64_t)(uintptr_t)(key)); /* direct key */
714     } else {
715         ret = vmstate_save_state(f, capsule->key_vmsd, key, capsule->vmdesc);
716         if (ret) {
717             capsule->ret = ret;
718             return true;
719         }
720     }
721 
722     /* put the data */
723     ret = vmstate_save_state(f, capsule->val_vmsd, value, capsule->vmdesc);
724     if (ret) {
725         capsule->ret = ret;
726         return true;
727     }
728     return false;
729 }
730 
731 static int put_gtree(QEMUFile *f, void *pv, size_t unused_size,
732                      const VMStateField *field, QJSON *vmdesc)
733 {
734     bool direct_key = (!field->start);
735     const VMStateDescription *key_vmsd = direct_key ? NULL : &field->vmsd[1];
736     const VMStateDescription *val_vmsd = &field->vmsd[0];
737     const char *key_vmsd_name = direct_key ? "direct" : key_vmsd->name;
738     struct put_gtree_data capsule = {
739         .f = f,
740         .key_vmsd = key_vmsd,
741         .val_vmsd = val_vmsd,
742         .vmdesc = vmdesc,
743         .ret = 0};
744     GTree **pval = pv;
745     GTree *tree = *pval;
746     uint32_t nnodes = g_tree_nnodes(tree);
747     int ret;
748 
749     trace_put_gtree(field->name, key_vmsd_name, val_vmsd->name, nnodes);
750     qemu_put_be32(f, nnodes);
751     g_tree_foreach(tree, put_gtree_elem, (gpointer)&capsule);
752     qemu_put_byte(f, false);
753     ret = capsule.ret;
754     if (ret) {
755         error_report("%s : failed to save gtree (%d)", field->name, ret);
756     }
757     trace_put_gtree_end(field->name, key_vmsd_name, val_vmsd->name, ret);
758     return ret;
759 }
760 
761 static int get_gtree(QEMUFile *f, void *pv, size_t unused_size,
762                      const VMStateField *field)
763 {
764     bool direct_key = (!field->start);
765     const VMStateDescription *key_vmsd = direct_key ? NULL : &field->vmsd[1];
766     const VMStateDescription *val_vmsd = &field->vmsd[0];
767     const char *key_vmsd_name = direct_key ? "direct" : key_vmsd->name;
768     int version_id = field->version_id;
769     size_t key_size = field->start;
770     size_t val_size = field->size;
771     int nnodes, count = 0;
772     GTree **pval = pv;
773     GTree *tree = *pval;
774     void *key, *val;
775     int ret = 0;
776 
777     /* in case of direct key, the key vmsd can be {}, ie. check fields */
778     if (!direct_key && version_id > key_vmsd->version_id) {
779         error_report("%s %s",  key_vmsd->name, "too new");
780         return -EINVAL;
781     }
782     if (!direct_key && version_id < key_vmsd->minimum_version_id) {
783         error_report("%s %s",  key_vmsd->name, "too old");
784         return -EINVAL;
785     }
786     if (version_id > val_vmsd->version_id) {
787         error_report("%s %s",  val_vmsd->name, "too new");
788         return -EINVAL;
789     }
790     if (version_id < val_vmsd->minimum_version_id) {
791         error_report("%s %s",  val_vmsd->name, "too old");
792         return -EINVAL;
793     }
794 
795     nnodes = qemu_get_be32(f);
796     trace_get_gtree(field->name, key_vmsd_name, val_vmsd->name, nnodes);
797 
798     while (qemu_get_byte(f)) {
799         if ((++count) > nnodes) {
800             ret = -EINVAL;
801             break;
802         }
803         if (direct_key) {
804             key = (void *)(uintptr_t)qemu_get_be64(f);
805         } else {
806             key = g_malloc0(key_size);
807             ret = vmstate_load_state(f, key_vmsd, key, version_id);
808             if (ret) {
809                 error_report("%s : failed to load %s (%d)",
810                              field->name, key_vmsd->name, ret);
811                 goto key_error;
812             }
813         }
814         val = g_malloc0(val_size);
815         ret = vmstate_load_state(f, val_vmsd, val, version_id);
816         if (ret) {
817             error_report("%s : failed to load %s (%d)",
818                          field->name, val_vmsd->name, ret);
819             goto val_error;
820         }
821         g_tree_insert(tree, key, val);
822     }
823     if (count != nnodes) {
824         error_report("%s inconsistent stream when loading the gtree",
825                      field->name);
826         return -EINVAL;
827     }
828     trace_get_gtree_end(field->name, key_vmsd_name, val_vmsd->name, ret);
829     return ret;
830 val_error:
831     g_free(val);
832 key_error:
833     if (!direct_key) {
834         g_free(key);
835     }
836     trace_get_gtree_end(field->name, key_vmsd_name, val_vmsd->name, ret);
837     return ret;
838 }
839 
840 
841 const VMStateInfo vmstate_info_gtree = {
842     .name = "gtree",
843     .get  = get_gtree,
844     .put  = put_gtree,
845 };
846