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xemu/migration/vmstate-types.c
Markus Armbruster 3ddba9a9e9 migration: Replace migration's JSON writer by the general one 
Commit 8118f0950f "migration: Append JSON description of migration
stream" needs a JSON writer.  The existing qobject_to_json() wasn't a
good fit, because it requires building a QObject to convert.  Instead,
migration got its very own JSON writer, in commit 190c882ce2 "QJSON:
Add JSON writer".  It tacitly limits numbers to int64_t, and strings
contents to characters that don't need escaping, unlike
qobject_to_json().

The previous commit factored the JSON writer out of qobject_to_json().
Replace migration's JSON writer by it.

Cc: Juan Quintela <quintela@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-17-armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-12-19 10:39:16 +01:00

894 lines
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/*
* 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,
};
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