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vmstate: Add support for VBUFFERS 

Support for buffer that are pointed by a pointer (i.e. not embedded)
where the size that we want to use is a field in the state.
We also need a new place to store where to start in the middle of the
buffer, as now it is a pointer, not the offset of the 1st field.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Juan Quintela 2009-12-02 12:36:38 +01:00 committed by Anthony Liguori
parent 8595387e3e
commit e61a1e0a11
2 changed files with 34 additions and 6 deletions
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20
hw/hw.h
View File

@ -294,14 +294,17 @@ enum VMStateFlags {
VMS_BUFFER = 0x020, /* static sized buffer */
VMS_ARRAY_OF_POINTER = 0x040,
VMS_VARRAY_UINT16 = 0x080, /* Array with size in uint16_t field */
VMS_VBUFFER = 0x100, /* Buffer with size in int32_t field */
};
typedef struct {
const char *name;
size_t offset;
size_t size;
size_t start;
int num;
size_t num_offset;
size_t size_offset;
const VMStateInfo *info;
enum VMStateFlags flags;
const VMStateDescription *vmsd;
@ -490,6 +493,17 @@ extern const VMStateInfo vmstate_info_unused_buffer;
.offset = vmstate_offset_buffer(_state, _field) + _start, \
}
#define VMSTATE_VBUFFER(_field, _state, _version, _test, _start, _field_size) { \
.name = (stringify(_field)), \
.version_id = (_version), \
.field_exists = (_test), \
.size_offset = vmstate_offset_value(_state, _field_size, int32_t),\
.info = &vmstate_info_buffer, \
.flags = VMS_VBUFFER|VMS_POINTER, \
.offset = offsetof(_state, _field), \
.start = (_start), \
}
#define VMSTATE_BUFFER_UNSAFE_INFO(_field, _state, _version, _info, _size) { \
.name = (stringify(_field)), \
.version_id = (_version), \
@ -683,6 +697,12 @@ extern const VMStateDescription vmstate_i2c_slave;
#define VMSTATE_BUFFER_START_MIDDLE(_f, _s, _start) \
VMSTATE_STATIC_BUFFER(_f, _s, 0, NULL, _start, sizeof(typeof_field(_s, _f)))
#define VMSTATE_PARTIAL_VBUFFER(_f, _s, _size) \
VMSTATE_VBUFFER(_f, _s, 0, NULL, 0, _size)
#define VMSTATE_SUB_VBUFFER(_f, _s, _start, _size) \
VMSTATE_VBUFFER(_f, _s, 0, NULL, _start, _size)
#define VMSTATE_BUFFER_TEST(_f, _s, _test) \
VMSTATE_STATIC_BUFFER(_f, _s, 0, _test, 0, sizeof(typeof_field(_s, _f)))

20
savevm.c
View File

@ -1143,7 +1143,11 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
field->version_id <= version_id)) {
void *base_addr = opaque + field->offset;
int ret, i, n_elems = 1;
int size = field->size;
if (field->flags & VMS_VBUFFER) {
size = *(int32_t *)(opaque+field->size_offset);
}
if (field->flags & VMS_ARRAY) {
n_elems = field->num;
} else if (field->flags & VMS_VARRAY_INT32) {
@ -1152,10 +1156,10 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
n_elems = *(uint16_t *)(opaque+field->num_offset);
}
if (field->flags & VMS_POINTER) {
base_addr = *(void **)base_addr;
base_addr = *(void **)base_addr + field->start;
}
for (i = 0; i < n_elems; i++) {
void *addr = base_addr + field->size * i;
void *addr = base_addr + size * i;
if (field->flags & VMS_ARRAY_OF_POINTER) {
addr = *(void **)addr;
@ -1163,7 +1167,7 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
if (field->flags & VMS_STRUCT) {
ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
} else {
ret = field->info->get(f, addr, field->size);
ret = field->info->get(f, addr, size);
}
if (ret < 0) {
@ -1192,7 +1196,11 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
field->field_exists(opaque, vmsd->version_id)) {
void *base_addr = opaque + field->offset;
int i, n_elems = 1;
int size = field->size;
if (field->flags & VMS_VBUFFER) {
size = *(int32_t *)(opaque+field->size_offset);
}
if (field->flags & VMS_ARRAY) {
n_elems = field->num;
} else if (field->flags & VMS_VARRAY_INT32) {
@ -1201,10 +1209,10 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
n_elems = *(uint16_t *)(opaque+field->num_offset);
}
if (field->flags & VMS_POINTER) {
base_addr = *(void **)base_addr;
base_addr = *(void **)base_addr + field->start;
}
for (i = 0; i < n_elems; i++) {
void *addr = base_addr + field->size * i;
void *addr = base_addr + size * i;
if (field->flags & VMS_ARRAY_OF_POINTER) {
addr = *(void **)addr;
@ -1212,7 +1220,7 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
if (field->flags & VMS_STRUCT) {
vmstate_save_state(f, field->vmsd, addr);
} else {
field->info->put(f, addr, field->size);
field->info->put(f, addr, size);
}
}
}