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vmstate: Define VARRAY with VMS_ALLOC 

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 <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alexey Kardashevskiy 2016-06-01 18:57:32 +10:00 committed by David Gibson
parent 44f2e6c10e
commit 705124ea6d
1 changed files with 10 additions and 0 deletions
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10
include/migration/vmstate.h
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@ -386,6 +386,16 @@ 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), \