This allows dynamic allocation for migrating arrays.
Already existing VMSTATE_VARRAY_UINT32 requires an array to be
pre-allocated, however there are cases when the size is not known in
advance and there is no real need to enforce it.
This defines another variant of VMSTATE_VARRAY_UINT32 with WMS_ALLOC
flag which tells the receiving side to allocate memory for the array
before receiving the data.
The first user of it is a dynamic DMA window which existence and size
are totally dynamic.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <th...@redhat.com>
---
include/migration/vmstate.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 0695d7c..5881d9f 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -295,6 +295,16 @@ extern const VMStateInfo vmstate_info_bitmap;
.offset = vmstate_offset_pointer(_state, _field, _type), \
}
+#define VMSTATE_VARRAY_UINT32_ALLOC(_field, _state, _field_num, _version,
_info, _type) {\
+ .name = (stringify(_field)), \
+ .version_id = (_version), \
+ .num_offset = vmstate_offset_value(_state, _field_num, uint32_t),\
+ .info = &(_info), \
+ .size = sizeof(_type), \
+ .flags = VMS_VARRAY_UINT32|VMS_POINTER|VMS_ALLOC, \
+ .offset = vmstate_offset_pointer(_state, _field, _type), \
+}
+
#define VMSTATE_VARRAY_UINT16_UNSAFE(_field, _state, _field_num, _version,
_info, _type) {\
.name = (stringify(_field)), \
.version_id = (_version), \
--
2.4.0.rc3.8.gfb3e7d5
