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migration/vmstate: document VMStateFlags

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The VMState API is rather sparsely documented. Start by describing the
meaning of all VMStateFlags.

Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Message-Id: <1456474693-11662-1-git-send-email-silbe@linux.vnet.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Sascha Silbe 2016-02-26 09:18:13 +01:00 committed by Amit Shah
parent a609ad8b69
commit 8da5ef579f
1 changed files with 90 additions and 10 deletions
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100
include/migration/vmstate.h
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@ -88,21 +88,101 @@ struct VMStateInfo {
};
enum VMStateFlags {
/* Ignored */
VMS_SINGLE = 0x001,
/* The struct member at opaque + VMStateField.offset is a pointer
* to the actual field (e.g. struct a { uint8_t *b;
* }). Dereference the pointer before using it as basis for
* further pointer arithmetic (see e.g. VMS_ARRAY). Does not
* affect the meaning of VMStateField.num_offset or
* VMStateField.size_offset; see VMS_VARRAY* and VMS_VBUFFER for
* those. */
VMS_POINTER = 0x002,
/* The field is an array of fixed size. VMStateField.num contains
* the number of entries in the array. The size of each entry is
* given by VMStateField.size and / or opaque +
* VMStateField.size_offset; see VMS_VBUFFER and
* VMS_MULTIPLY. Each array entry will be processed individually
* (VMStateField.info.get()/put() if VMS_STRUCT is not set,
* recursion into VMStateField.vmsd if VMS_STRUCT is set). May not
* be combined with VMS_VARRAY*. */
VMS_ARRAY = 0x004,
/* The field is itself a struct, containing one or more
* fields. Recurse into VMStateField.vmsd. Most useful in
* combination with VMS_ARRAY / VMS_VARRAY*, recursing into each
* array entry. */
VMS_STRUCT = 0x008,
VMS_VARRAY_INT32 = 0x010, /* Array with size in int32_t field*/
VMS_BUFFER = 0x020, /* static sized buffer */
/* The field is an array of variable size. The int32_t at opaque +
* VMStateField.num_offset contains the number of entries in the
* array. See the VMS_ARRAY description regarding array handling
* in general. May not be combined with VMS_ARRAY or any other
* VMS_VARRAY*. */
VMS_VARRAY_INT32 = 0x010,
/* Ignored */
VMS_BUFFER = 0x020,
/* The field is a (fixed-size or variable-size) array of pointers
* (e.g. struct a { uint8_t *b[]; }). Dereference each array entry
* before using it. Note: Does not imply any one of VMS_ARRAY /
* VMS_VARRAY*; these need to be set explicitly. */
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 */
VMS_MULTIPLY = 0x200, /* multiply "size" field by field_size */
VMS_VARRAY_UINT8 = 0x400, /* Array with size in uint8_t field*/
VMS_VARRAY_UINT32 = 0x800, /* Array with size in uint32_t field*/
VMS_MUST_EXIST = 0x1000, /* Field must exist in input */
VMS_ALLOC = 0x2000, /* Alloc a buffer on the destination */
VMS_MULTIPLY_ELEMENTS = 0x4000, /* multiply varray size by field->num */
/* The field is an array of variable size. The uint16_t at opaque
* + VMStateField.num_offset (subject to VMS_MULTIPLY_ELEMENTS)
* contains the number of entries in the array. See the VMS_ARRAY
* description regarding array handling in general. May not be
* combined with VMS_ARRAY or any other VMS_VARRAY*. */
VMS_VARRAY_UINT16 = 0x080,
/* The size of the individual entries (a single array entry if
* VMS_ARRAY or any of VMS_VARRAY* are set, or the field itself if
* neither is set) is variable (i.e. not known at compile-time),
* but the same for all entries. Use the int32_t at opaque +
* VMStateField.size_offset (subject to VMS_MULTIPLY) to determine
* the size of each (and every) entry. */
VMS_VBUFFER = 0x100,
/* Multiply the entry size given by the int32_t at opaque +
* VMStateField.size_offset (see VMS_VBUFFER description) with
* VMStateField.size to determine the number of bytes to be
* allocated. Only valid in combination with VMS_VBUFFER. */
VMS_MULTIPLY = 0x200,
/* The field is an array of variable size. The uint8_t at opaque +
* VMStateField.num_offset (subject to VMS_MULTIPLY_ELEMENTS)
* contains the number of entries in the array. See the VMS_ARRAY
* description regarding array handling in general. May not be
* combined with VMS_ARRAY or any other VMS_VARRAY*. */
VMS_VARRAY_UINT8 = 0x400,
/* The field is an array of variable size. The uint32_t at opaque
* + VMStateField.num_offset (subject to VMS_MULTIPLY_ELEMENTS)
* contains the number of entries in the array. See the VMS_ARRAY
* description regarding array handling in general. May not be
* combined with VMS_ARRAY or any other VMS_VARRAY*. */
VMS_VARRAY_UINT32 = 0x800,
/* Fail loading the serialised VM state if this field is missing
* from the input. */
VMS_MUST_EXIST = 0x1000,
/* When loading serialised VM state, allocate memory for the
* (entire) field. Only valid in combination with
* VMS_POINTER. Note: Not all combinations with other flags are
* currently supported, e.g. VMS_ALLOC|VMS_ARRAY_OF_POINTER won't
* cause the individual entries to be allocated. */
VMS_ALLOC = 0x2000,
/* Multiply the number of entries given by the integer at opaque +
* VMStateField.num_offset (see VMS_VARRAY*) with VMStateField.num
* to determine the number of entries in the array. Only valid in
* combination with one of VMS_VARRAY*. */
VMS_MULTIPLY_ELEMENTS = 0x4000,
};
typedef struct {