qemu

vmstate-types.c (22885B)

---

 /*
  * VMStateInfo's for basic typse
  *
  * Copyright (c) 2009-2017 Red Hat Inc
  *
  * Authors:
  *  Juan Quintela <quintela@redhat.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
 #include "qemu/osdep.h"
 #include "qemu/cpu-float.h"
 #include "qemu-file.h"
 #include "migration.h"
 #include "migration/vmstate.h"
 #include "qemu/error-report.h"
 #include "qemu/queue.h"
 #include "trace.h"
 
 /* bool */
 
 static int get_bool(QEMUFile *f, void *pv, size_t size,
                     const VMStateField *field)
 {
     bool *v = pv;
     *v = qemu_get_byte(f);
     return 0;
 }
 
 static int put_bool(QEMUFile *f, void *pv, size_t size,
                     const VMStateField *field, JSONWriter *vmdesc)
 {
     bool *v = pv;
     qemu_put_byte(f, *v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_bool = {
     .name = "bool",
     .get  = get_bool,
     .put  = put_bool,
 };
 
 /* 8 bit int */
 
 static int get_int8(QEMUFile *f, void *pv, size_t size,
                     const VMStateField *field)
 {
     int8_t *v = pv;
     qemu_get_s8s(f, v);
     return 0;
 }
 
 static int put_int8(QEMUFile *f, void *pv, size_t size,
                     const VMStateField *field, JSONWriter *vmdesc)
 {
     int8_t *v = pv;
     qemu_put_s8s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_int8 = {
     .name = "int8",
     .get  = get_int8,
     .put  = put_int8,
 };
 
 /* 16 bit int */
 
 static int get_int16(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field)
 {
     int16_t *v = pv;
     qemu_get_sbe16s(f, v);
     return 0;
 }
 
 static int put_int16(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field, JSONWriter *vmdesc)
 {
     int16_t *v = pv;
     qemu_put_sbe16s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_int16 = {
     .name = "int16",
     .get  = get_int16,
     .put  = put_int16,
 };
 
 /* 32 bit int */
 
 static int get_int32(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field)
 {
     int32_t *v = pv;
     qemu_get_sbe32s(f, v);
     return 0;
 }
 
 static int put_int32(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field, JSONWriter *vmdesc)
 {
     int32_t *v = pv;
     qemu_put_sbe32s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_int32 = {
     .name = "int32",
     .get  = get_int32,
     .put  = put_int32,
 };
 
 /* 32 bit int. See that the received value is the same than the one
    in the field */
 
 static int get_int32_equal(QEMUFile *f, void *pv, size_t size,
                            const VMStateField *field)
 {
     int32_t *v = pv;
     int32_t v2;
     qemu_get_sbe32s(f, &v2);
 
     if (*v == v2) {
         return 0;
     }
     error_report("%" PRIx32 " != %" PRIx32, *v, v2);
     if (field->err_hint) {
         error_printf("%s\n", field->err_hint);
     }
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_int32_equal = {
     .name = "int32 equal",
     .get  = get_int32_equal,
     .put  = put_int32,
 };
 
 /* 32 bit int. Check that the received value is non-negative
  * and less than or equal to the one in the field.
  */
 
 static int get_int32_le(QEMUFile *f, void *pv, size_t size,
                         const VMStateField *field)
 {
     int32_t *cur = pv;
     int32_t loaded;
     qemu_get_sbe32s(f, &loaded);
 
     if (loaded >= 0 && loaded <= *cur) {
         *cur = loaded;
         return 0;
     }
     error_report("Invalid value %" PRId32
                  " expecting positive value <= %" PRId32,
                  loaded, *cur);
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_int32_le = {
     .name = "int32 le",
     .get  = get_int32_le,
     .put  = put_int32,
 };
 
 /* 64 bit int */
 
 static int get_int64(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field)
 {
     int64_t *v = pv;
     qemu_get_sbe64s(f, v);
     return 0;
 }
 
 static int put_int64(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field, JSONWriter *vmdesc)
 {
     int64_t *v = pv;
     qemu_put_sbe64s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_int64 = {
     .name = "int64",
     .get  = get_int64,
     .put  = put_int64,
 };
 
 /* 8 bit unsigned int */
 
 static int get_uint8(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field)
 {
     uint8_t *v = pv;
     qemu_get_8s(f, v);
     return 0;
 }
 
 static int put_uint8(QEMUFile *f, void *pv, size_t size,
                      const VMStateField *field, JSONWriter *vmdesc)
 {
     uint8_t *v = pv;
     qemu_put_8s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_uint8 = {
     .name = "uint8",
     .get  = get_uint8,
     .put  = put_uint8,
 };
 
 /* 16 bit unsigned int */
 
 static int get_uint16(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field)
 {
     uint16_t *v = pv;
     qemu_get_be16s(f, v);
     return 0;
 }
 
 static int put_uint16(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field, JSONWriter *vmdesc)
 {
     uint16_t *v = pv;
     qemu_put_be16s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_uint16 = {
     .name = "uint16",
     .get  = get_uint16,
     .put  = put_uint16,
 };
 
 /* 32 bit unsigned int */
 
 static int get_uint32(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field)
 {
     uint32_t *v = pv;
     qemu_get_be32s(f, v);
     return 0;
 }
 
 static int put_uint32(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field, JSONWriter *vmdesc)
 {
     uint32_t *v = pv;
     qemu_put_be32s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_uint32 = {
     .name = "uint32",
     .get  = get_uint32,
     .put  = put_uint32,
 };
 
 /* 32 bit uint. See that the received value is the same than the one
    in the field */
 
 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size,
                             const VMStateField *field)
 {
     uint32_t *v = pv;
     uint32_t v2;
     qemu_get_be32s(f, &v2);
 
     if (*v == v2) {
         return 0;
     }
     error_report("%" PRIx32 " != %" PRIx32, *v, v2);
     if (field->err_hint) {
         error_printf("%s\n", field->err_hint);
     }
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_uint32_equal = {
     .name = "uint32 equal",
     .get  = get_uint32_equal,
     .put  = put_uint32,
 };
 
 /* 64 bit unsigned int */
 
 static int get_uint64(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field)
 {
     uint64_t *v = pv;
     qemu_get_be64s(f, v);
     return 0;
 }
 
 static int put_uint64(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field, JSONWriter *vmdesc)
 {
     uint64_t *v = pv;
     qemu_put_be64s(f, v);
     return 0;
 }
 
 const VMStateInfo vmstate_info_uint64 = {
     .name = "uint64",
     .get  = get_uint64,
     .put  = put_uint64,
 };
 
 static int get_nullptr(QEMUFile *f, void *pv, size_t size,
                        const VMStateField *field)
 
 {
     if (qemu_get_byte(f) == VMS_NULLPTR_MARKER) {
         return  0;
     }
     error_report("vmstate: get_nullptr expected VMS_NULLPTR_MARKER");
     return -EINVAL;
 }
 
 static int put_nullptr(QEMUFile *f, void *pv, size_t size,
                         const VMStateField *field, JSONWriter *vmdesc)
 
 {
     if (pv == NULL) {
         qemu_put_byte(f, VMS_NULLPTR_MARKER);
         return 0;
     }
     error_report("vmstate: put_nullptr must be called with pv == NULL");
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_nullptr = {
     .name = "uint64",
     .get  = get_nullptr,
     .put  = put_nullptr,
 };
 
 /* 64 bit unsigned int. See that the received value is the same than the one
    in the field */
 
 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size,
                             const VMStateField *field)
 {
     uint64_t *v = pv;
     uint64_t v2;
     qemu_get_be64s(f, &v2);
 
     if (*v == v2) {
         return 0;
     }
     error_report("%" PRIx64 " != %" PRIx64, *v, v2);
     if (field->err_hint) {
         error_printf("%s\n", field->err_hint);
     }
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_uint64_equal = {
     .name = "int64 equal",
     .get  = get_uint64_equal,
     .put  = put_uint64,
 };
 
 /* 8 bit int. See that the received value is the same than the one
    in the field */
 
 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size,
                            const VMStateField *field)
 {
     uint8_t *v = pv;
     uint8_t v2;
     qemu_get_8s(f, &v2);
 
     if (*v == v2) {
         return 0;
     }
     error_report("%x != %x", *v, v2);
     if (field->err_hint) {
         error_printf("%s\n", field->err_hint);
     }
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_uint8_equal = {
     .name = "uint8 equal",
     .get  = get_uint8_equal,
     .put  = put_uint8,
 };
 
 /* 16 bit unsigned int int. See that the received value is the same than the one
    in the field */
 
 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size,
                             const VMStateField *field)
 {
     uint16_t *v = pv;
     uint16_t v2;
     qemu_get_be16s(f, &v2);
 
     if (*v == v2) {
         return 0;
     }
     error_report("%x != %x", *v, v2);
     if (field->err_hint) {
         error_printf("%s\n", field->err_hint);
     }
     return -EINVAL;
 }
 
 const VMStateInfo vmstate_info_uint16_equal = {
     .name = "uint16 equal",
     .get  = get_uint16_equal,
     .put  = put_uint16,
 };
 
 /* CPU_DoubleU type */
 
 static int get_cpudouble(QEMUFile *f, void *pv, size_t size,
                          const VMStateField *field)
 {
     CPU_DoubleU *v = pv;
     qemu_get_be32s(f, &v->l.upper);
     qemu_get_be32s(f, &v->l.lower);
     return 0;
 }
 
 static int put_cpudouble(QEMUFile *f, void *pv, size_t size,
                          const VMStateField *field, JSONWriter *vmdesc)
 {
     CPU_DoubleU *v = pv;
     qemu_put_be32s(f, &v->l.upper);
     qemu_put_be32s(f, &v->l.lower);
     return 0;
 }
 
 const VMStateInfo vmstate_info_cpudouble = {
     .name = "CPU_Double_U",
     .get  = get_cpudouble,
     .put  = put_cpudouble,
 };
 
 /* uint8_t buffers */
 
 static int get_buffer(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field)
 {
     uint8_t *v = pv;
     qemu_get_buffer(f, v, size);
     return 0;
 }
 
 static int put_buffer(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field, JSONWriter *vmdesc)
 {
     uint8_t *v = pv;
     qemu_put_buffer(f, v, size);
     return 0;
 }
 
 const VMStateInfo vmstate_info_buffer = {
     .name = "buffer",
     .get  = get_buffer,
     .put  = put_buffer,
 };
 
 /* unused buffers: space that was used for some fields that are
    not useful anymore */
 
 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size,
                              const VMStateField *field)
 {
     uint8_t buf[1024];
     int block_len;
 
     while (size > 0) {
         block_len = MIN(sizeof(buf), size);
         size -= block_len;
         qemu_get_buffer(f, buf, block_len);
     }
    return 0;
 }
 
 static int put_unused_buffer(QEMUFile *f, void *pv, size_t size,
                              const VMStateField *field, JSONWriter *vmdesc)
 {
     static const uint8_t buf[1024];
     int block_len;
 
     while (size > 0) {
         block_len = MIN(sizeof(buf), size);
         size -= block_len;
         qemu_put_buffer(f, buf, block_len);
     }
 
     return 0;
 }
 
 const VMStateInfo vmstate_info_unused_buffer = {
     .name = "unused_buffer",
     .get  = get_unused_buffer,
     .put  = put_unused_buffer,
 };
 
 /* vmstate_info_tmp, see VMSTATE_WITH_TMP, the idea is that we allocate
  * a temporary buffer and the pre_load/pre_save methods in the child vmsd
  * copy stuff from the parent into the child and do calculations to fill
  * in fields that don't really exist in the parent but need to be in the
  * stream.
  */
 static int get_tmp(QEMUFile *f, void *pv, size_t size,
                    const VMStateField *field)
 {
     int ret;
     const VMStateDescription *vmsd = field->vmsd;
     int version_id = field->version_id;
     void *tmp = g_malloc(size);
 
     /* Writes the parent field which is at the start of the tmp */
     *(void **)tmp = pv;
     ret = vmstate_load_state(f, vmsd, tmp, version_id);
     g_free(tmp);
     return ret;
 }
 
 static int put_tmp(QEMUFile *f, void *pv, size_t size,
                    const VMStateField *field, JSONWriter *vmdesc)
 {
     const VMStateDescription *vmsd = field->vmsd;
     void *tmp = g_malloc(size);
     int ret;
 
     /* Writes the parent field which is at the start of the tmp */
     *(void **)tmp = pv;
     ret = vmstate_save_state(f, vmsd, tmp, vmdesc);
     g_free(tmp);
 
     return ret;
 }
 
 const VMStateInfo vmstate_info_tmp = {
     .name = "tmp",
     .get = get_tmp,
     .put = put_tmp,
 };
 
 /* bitmaps (as defined by bitmap.h). Note that size here is the size
  * of the bitmap in bits. The on-the-wire format of a bitmap is 64
  * bit words with the bits in big endian order. The in-memory format
  * is an array of 'unsigned long', which may be either 32 or 64 bits.
  */
 /* This is the number of 64 bit words sent over the wire */
 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
 static int get_bitmap(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field)
 {
     unsigned long *bmp = pv;
     int i, idx = 0;
     for (i = 0; i < BITS_TO_U64S(size); i++) {
         uint64_t w = qemu_get_be64(f);
         bmp[idx++] = w;
         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
             bmp[idx++] = w >> 32;
         }
     }
     return 0;
 }
 
 static int put_bitmap(QEMUFile *f, void *pv, size_t size,
                       const VMStateField *field, JSONWriter *vmdesc)
 {
     unsigned long *bmp = pv;
     int i, idx = 0;
     for (i = 0; i < BITS_TO_U64S(size); i++) {
         uint64_t w = bmp[idx++];
         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
             w |= ((uint64_t)bmp[idx++]) << 32;
         }
         qemu_put_be64(f, w);
     }
 
     return 0;
 }
 
 const VMStateInfo vmstate_info_bitmap = {
     .name = "bitmap",
     .get = get_bitmap,
     .put = put_bitmap,
 };
 
 /* get for QTAILQ
  * meta data about the QTAILQ is encoded in a VMStateField structure
  */
 static int get_qtailq(QEMUFile *f, void *pv, size_t unused_size,
                       const VMStateField *field)
 {
     int ret = 0;
     const VMStateDescription *vmsd = field->vmsd;
     /* size of a QTAILQ element */
     size_t size = field->size;
     /* offset of the QTAILQ entry in a QTAILQ element */
     size_t entry_offset = field->start;
     int version_id = field->version_id;
     void *elm;
 
     trace_get_qtailq(vmsd->name, version_id);
     if (version_id > vmsd->version_id) {
         error_report("%s %s",  vmsd->name, "too new");
         trace_get_qtailq_end(vmsd->name, "too new", -EINVAL);
 
         return -EINVAL;
     }
     if (version_id < vmsd->minimum_version_id) {
         error_report("%s %s",  vmsd->name, "too old");
         trace_get_qtailq_end(vmsd->name, "too old", -EINVAL);
         return -EINVAL;
     }
 
     while (qemu_get_byte(f)) {
         elm = g_malloc(size);
         ret = vmstate_load_state(f, vmsd, elm, version_id);
         if (ret) {
             return ret;
         }
         QTAILQ_RAW_INSERT_TAIL(pv, elm, entry_offset);
     }
 
     trace_get_qtailq_end(vmsd->name, "end", ret);
     return ret;
 }
 
 /* put for QTAILQ */
 static int put_qtailq(QEMUFile *f, void *pv, size_t unused_size,
                       const VMStateField *field, JSONWriter *vmdesc)
 {
     const VMStateDescription *vmsd = field->vmsd;
     /* offset of the QTAILQ entry in a QTAILQ element*/
     size_t entry_offset = field->start;
     void *elm;
     int ret;
 
     trace_put_qtailq(vmsd->name, vmsd->version_id);
 
     QTAILQ_RAW_FOREACH(elm, pv, entry_offset) {
         qemu_put_byte(f, true);
         ret = vmstate_save_state(f, vmsd, elm, vmdesc);
         if (ret) {
             return ret;
         }
     }
     qemu_put_byte(f, false);
 
     trace_put_qtailq_end(vmsd->name, "end");
 
     return 0;
 }
 const VMStateInfo vmstate_info_qtailq = {
     .name = "qtailq",
     .get  = get_qtailq,
     .put  = put_qtailq,
 };
 
 struct put_gtree_data {
     QEMUFile *f;
     const VMStateDescription *key_vmsd;
     const VMStateDescription *val_vmsd;
     JSONWriter *vmdesc;
     int ret;
 };
 
 static gboolean put_gtree_elem(gpointer key, gpointer value, gpointer data)
 {
     struct put_gtree_data *capsule = (struct put_gtree_data *)data;
     QEMUFile *f = capsule->f;
     int ret;
 
     qemu_put_byte(f, true);
 
     /* put the key */
     if (!capsule->key_vmsd) {
         qemu_put_be64(f, (uint64_t)(uintptr_t)(key)); /* direct key */
     } else {
         ret = vmstate_save_state(f, capsule->key_vmsd, key, capsule->vmdesc);
         if (ret) {
             capsule->ret = ret;
             return true;
         }
     }
 
     /* put the data */
     ret = vmstate_save_state(f, capsule->val_vmsd, value, capsule->vmdesc);
     if (ret) {
         capsule->ret = ret;
         return true;
     }
     return false;
 }
 
 static int put_gtree(QEMUFile *f, void *pv, size_t unused_size,
                      const VMStateField *field, JSONWriter *vmdesc)
 {
     bool direct_key = (!field->start);
     const VMStateDescription *key_vmsd = direct_key ? NULL : &field->vmsd[1];
     const VMStateDescription *val_vmsd = &field->vmsd[0];
     const char *key_vmsd_name = direct_key ? "direct" : key_vmsd->name;
     struct put_gtree_data capsule = {
         .f = f,
         .key_vmsd = key_vmsd,
         .val_vmsd = val_vmsd,
         .vmdesc = vmdesc,
         .ret = 0};
     GTree **pval = pv;
     GTree *tree = *pval;
     uint32_t nnodes = g_tree_nnodes(tree);
     int ret;
 
     trace_put_gtree(field->name, key_vmsd_name, val_vmsd->name, nnodes);
     qemu_put_be32(f, nnodes);
     g_tree_foreach(tree, put_gtree_elem, (gpointer)&capsule);
     qemu_put_byte(f, false);
     ret = capsule.ret;
     if (ret) {
         error_report("%s : failed to save gtree (%d)", field->name, ret);
     }
     trace_put_gtree_end(field->name, key_vmsd_name, val_vmsd->name, ret);
     return ret;
 }
 
 static int get_gtree(QEMUFile *f, void *pv, size_t unused_size,
                      const VMStateField *field)
 {
     bool direct_key = (!field->start);
     const VMStateDescription *key_vmsd = direct_key ? NULL : &field->vmsd[1];
     const VMStateDescription *val_vmsd = &field->vmsd[0];
     const char *key_vmsd_name = direct_key ? "direct" : key_vmsd->name;
     int version_id = field->version_id;
     size_t key_size = field->start;
     size_t val_size = field->size;
     int nnodes, count = 0;
     GTree **pval = pv;
     GTree *tree = *pval;
     void *key, *val;
     int ret = 0;
 
     /* in case of direct key, the key vmsd can be {}, ie. check fields */
     if (!direct_key && version_id > key_vmsd->version_id) {
         error_report("%s %s",  key_vmsd->name, "too new");
         return -EINVAL;
     }
     if (!direct_key && version_id < key_vmsd->minimum_version_id) {
         error_report("%s %s",  key_vmsd->name, "too old");
         return -EINVAL;
     }
     if (version_id > val_vmsd->version_id) {
         error_report("%s %s",  val_vmsd->name, "too new");
         return -EINVAL;
     }
     if (version_id < val_vmsd->minimum_version_id) {
         error_report("%s %s",  val_vmsd->name, "too old");
         return -EINVAL;
     }
 
     nnodes = qemu_get_be32(f);
     trace_get_gtree(field->name, key_vmsd_name, val_vmsd->name, nnodes);
 
     while (qemu_get_byte(f)) {
         if ((++count) > nnodes) {
             ret = -EINVAL;
             break;
         }
         if (direct_key) {
             key = (void *)(uintptr_t)qemu_get_be64(f);
         } else {
             key = g_malloc0(key_size);
             ret = vmstate_load_state(f, key_vmsd, key, version_id);
             if (ret) {
                 error_report("%s : failed to load %s (%d)",
                              field->name, key_vmsd->name, ret);
                 goto key_error;
             }
         }
         val = g_malloc0(val_size);
         ret = vmstate_load_state(f, val_vmsd, val, version_id);
         if (ret) {
             error_report("%s : failed to load %s (%d)",
                          field->name, val_vmsd->name, ret);
             goto val_error;
         }
         g_tree_insert(tree, key, val);
     }
     if (count != nnodes) {
         error_report("%s inconsistent stream when loading the gtree",
                      field->name);
         return -EINVAL;
     }
     trace_get_gtree_end(field->name, key_vmsd_name, val_vmsd->name, ret);
     return ret;
 val_error:
     g_free(val);
 key_error:
     if (!direct_key) {
         g_free(key);
     }
     trace_get_gtree_end(field->name, key_vmsd_name, val_vmsd->name, ret);
     return ret;
 }
 
 
 const VMStateInfo vmstate_info_gtree = {
     .name = "gtree",
     .get  = get_gtree,
     .put  = put_gtree,
 };
 
 static int put_qlist(QEMUFile *f, void *pv, size_t unused_size,
                      const VMStateField *field, JSONWriter *vmdesc)
 {
     const VMStateDescription *vmsd = field->vmsd;
     /* offset of the QTAILQ entry in a QTAILQ element*/
     size_t entry_offset = field->start;
     void *elm;
     int ret;
 
     trace_put_qlist(field->name, vmsd->name, vmsd->version_id);
     QLIST_RAW_FOREACH(elm, pv, entry_offset) {
         qemu_put_byte(f, true);
         ret = vmstate_save_state(f, vmsd, elm, vmdesc);
         if (ret) {
             error_report("%s: failed to save %s (%d)", field->name,
                          vmsd->name, ret);
             return ret;
         }
     }
     qemu_put_byte(f, false);
     trace_put_qlist_end(field->name, vmsd->name);
 
     return 0;
 }
 
 static int get_qlist(QEMUFile *f, void *pv, size_t unused_size,
                      const VMStateField *field)
 {
     int ret = 0;
     const VMStateDescription *vmsd = field->vmsd;
     /* size of a QLIST element */
     size_t size = field->size;
     /* offset of the QLIST entry in a QLIST element */
     size_t entry_offset = field->start;
     int version_id = field->version_id;
     void *elm, *prev = NULL;
 
     trace_get_qlist(field->name, vmsd->name, vmsd->version_id);
     if (version_id > vmsd->version_id) {
         error_report("%s %s",  vmsd->name, "too new");
         return -EINVAL;
     }
     if (version_id < vmsd->minimum_version_id) {
         error_report("%s %s",  vmsd->name, "too old");
         return -EINVAL;
     }
 
     while (qemu_get_byte(f)) {
         elm = g_malloc(size);
         ret = vmstate_load_state(f, vmsd, elm, version_id);
         if (ret) {
             error_report("%s: failed to load %s (%d)", field->name,
                          vmsd->name, ret);
             g_free(elm);
             return ret;
         }
         if (!prev) {
             QLIST_RAW_INSERT_HEAD(pv, elm, entry_offset);
         } else {
             QLIST_RAW_INSERT_AFTER(pv, prev, elm, entry_offset);
         }
         prev = elm;
     }
     trace_get_qlist_end(field->name, vmsd->name);
 
     return ret;
 }
 
 const VMStateInfo vmstate_info_qlist = {
     .name = "qlist",
     .get  = get_qlist,
     .put  = put_qlist,
 };