Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 893 insertions, 0 deletions

diff --git a/migration/vmstate-types.c b/migration/vmstate-types.c
new file mode 100644
index 000000000..bf4d44030
--- /dev/null
+++ b/migration/vmstate-types.c
@@ -0,0 +1,893 @@
+/*
+ * 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-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,
+};