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vmstate: Allow dynamic allocation for VBUFFER during migration 

This extends use of VMS_ALLOC flag from arrays to VBUFFER as well.

This defines VMSTATE_VBUFFER_ALLOC_UINT32 which makes use of VMS_ALLOC
and uses uint32_t type for a size.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2014-10-02 19:56:02 +10:00 committed by Juan Quintela
parent 7ea2d269cb
commit 94ed706d53
2 changed files with 21 additions and 3 deletions
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11
include/migration/vmstate.h
View File

@ -484,6 +484,17 @@ extern const VMStateInfo vmstate_info_bitmap;
.start = (_start), \
}
#define VMSTATE_VBUFFER_ALLOC_UINT32(_field, _state, _version, _test, _start, _field_size) { \
.name = (stringify(_field)), \
.version_id = (_version), \
.field_exists = (_test), \
.size_offset = vmstate_offset_value(_state, _field_size, uint32_t),\
.info = &vmstate_info_buffer, \
.flags = VMS_VBUFFER|VMS_POINTER|VMS_ALLOC, \
.offset = offsetof(_state, _field), \
.start = (_start), \
}
#define VMSTATE_BUFFER_UNSAFE_INFO(_field, _state, _version, _info, _size) { \
.name = (stringify(_field)), \
.version_id = (_version), \

13
vmstate.c
View File

@ -49,9 +49,16 @@ static void *vmstate_base_addr(void *opaque, VMStateField *field, bool alloc)
if (field->flags & VMS_POINTER) {
if (alloc && (field->flags & VMS_ALLOC)) {
int n_elems = vmstate_n_elems(opaque, field);
if (n_elems) {
gsize size = n_elems * field->size;
gsize size = 0;
if (field->flags & VMS_VBUFFER) {
size = vmstate_size(opaque, field);
} else {
int n_elems = vmstate_n_elems(opaque, field);
if (n_elems) {
size = n_elems * field->size;
}
}
if (size) {
*((void **)base_addr + field->start) = g_malloc(size);
}
}