| /* SPDX-License-Identifier: BSD-3-Clause */ |
| /* |
| * QEMU migration/snapshot declarations |
| * |
| * Copyright (c) 2009-2011 Red Hat, Inc. |
| * |
| * Original author: Juan Quintela <quintela@redhat.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * 3. Neither the name of the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #ifndef VMSTATE_H_ |
| #define VMSTATE_H_ |
| |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include "slirp.h" |
| #include "stream.h" |
| |
| #define stringify(s) tostring(s) |
| #define tostring(s) #s |
| |
| typedef struct VMStateInfo VMStateInfo; |
| typedef struct VMStateDescription VMStateDescription; |
| typedef struct VMStateField VMStateField; |
| |
| int slirp_vmstate_save_state(SlirpOStream *f, const VMStateDescription *vmsd, |
| void *opaque); |
| int slirp_vmstate_load_state(SlirpIStream *f, const VMStateDescription *vmsd, |
| void *opaque, int version_id); |
| |
| /* VMStateInfo allows customized migration of objects that don't fit in |
| * any category in VMStateFlags. Additional information is always passed |
| * into get and put in terms of field and vmdesc parameters. However |
| * these two parameters should only be used in cases when customized |
| * handling is needed, such as QTAILQ. For primitive data types such as |
| * integer, field and vmdesc parameters should be ignored inside get/put. |
| */ |
| struct VMStateInfo { |
| const char *name; |
| int (*get)(SlirpIStream *f, void *pv, size_t size, |
| const VMStateField *field); |
| int (*put)(SlirpOStream *f, void *pv, size_t size, |
| const VMStateField *field); |
| }; |
| |
| 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, |
| |
| /* 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, |
| |
| /* 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, |
| |
| /* A structure field that is like VMS_STRUCT, but uses |
| * VMStateField.struct_version_id to tell which version of the |
| * structure we are referencing to use. */ |
| VMS_VSTRUCT = 0x8000, |
| |
| /* Marker for end of list */ |
| VMS_END = 0x10000 |
| }; |
| |
| struct VMStateField { |
| 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; |
| int version_id; |
| int struct_version_id; |
| bool (*field_exists)(void *opaque, int version_id); |
| }; |
| |
| struct VMStateDescription { |
| const char *name; |
| int version_id; |
| int (*pre_load)(void *opaque); |
| int (*post_load)(void *opaque, int version_id); |
| int (*pre_save)(void *opaque); |
| VMStateField *fields; |
| }; |
| |
| |
| extern const VMStateInfo slirp_vmstate_info_int16; |
| extern const VMStateInfo slirp_vmstate_info_int32; |
| extern const VMStateInfo slirp_vmstate_info_uint8; |
| extern const VMStateInfo slirp_vmstate_info_uint16; |
| extern const VMStateInfo slirp_vmstate_info_uint32; |
| |
| /** Put this in the stream when migrating a null pointer.*/ |
| #define VMS_NULLPTR_MARKER (0x30U) /* '0' */ |
| extern const VMStateInfo slirp_vmstate_info_nullptr; |
| |
| extern const VMStateInfo slirp_vmstate_info_buffer; |
| extern const VMStateInfo slirp_vmstate_info_tmp; |
| |
| #ifdef __GNUC__ |
| #define type_check_array(t1, t2, n) ((t1(*)[n])0 - (t2 *)0) |
| #define type_check_pointer(t1, t2) ((t1 **)0 - (t2 *)0) |
| #define typeof_field(type, field) typeof(((type *)0)->field) |
| #define type_check(t1, t2) ((t1 *)0 - (t2 *)0) |
| #else |
| #define type_check_array(t1, t2, n) 0 |
| #define type_check_pointer(t1, t2) 0 |
| #define typeof_field(type, field) (((type *)0)->field) |
| #define type_check(t1, t2) 0 |
| #endif |
| |
| #define vmstate_offset_value(_state, _field, _type) \ |
| (offsetof(_state, _field) + type_check(_type, typeof_field(_state, _field))) |
| |
| #define vmstate_offset_pointer(_state, _field, _type) \ |
| (offsetof(_state, _field) + \ |
| type_check_pointer(_type, typeof_field(_state, _field))) |
| |
| #define vmstate_offset_array(_state, _field, _type, _num) \ |
| (offsetof(_state, _field) + \ |
| type_check_array(_type, typeof_field(_state, _field), _num)) |
| |
| #define vmstate_offset_buffer(_state, _field) \ |
| vmstate_offset_array(_state, _field, uint8_t, \ |
| sizeof(typeof_field(_state, _field))) |
| |
| /* In the macros below, if there is a _version, that means the macro's |
| * field will be processed only if the version being received is >= |
| * the _version specified. In general, if you add a new field, you |
| * would increment the structure's version and put that version |
| * number into the new field so it would only be processed with the |
| * new version. |
| * |
| * In particular, for VMSTATE_STRUCT() and friends the _version does |
| * *NOT* pick the version of the sub-structure. It works just as |
| * specified above. The version of the top-level structure received |
| * is passed down to all sub-structures. This means that the |
| * sub-structures must have version that are compatible with all the |
| * structures that use them. |
| * |
| * If you want to specify the version of the sub-structure, use |
| * VMSTATE_VSTRUCT(), which allows the specific sub-structure version |
| * to be directly specified. |
| */ |
| |
| #define VMSTATE_SINGLE_TEST(_field, _state, _test, _version, _info, _type) \ |
| { \ |
| .name = (stringify(_field)), .version_id = (_version), \ |
| .field_exists = (_test), .size = sizeof(_type), .info = &(_info), \ |
| .flags = VMS_SINGLE, \ |
| .offset = vmstate_offset_value(_state, _field, _type), \ |
| } |
| |
| #define VMSTATE_ARRAY(_field, _state, _num, _version, _info, _type) \ |
| { \ |
| .name = (stringify(_field)), .version_id = (_version), .num = (_num), \ |
| .info = &(_info), .size = sizeof(_type), .flags = VMS_ARRAY, \ |
| .offset = vmstate_offset_array(_state, _field, _type, _num), \ |
| } |
| |
| #define VMSTATE_STRUCT_TEST(_field, _state, _test, _version, _vmsd, _type) \ |
| { \ |
| .name = (stringify(_field)), .version_id = (_version), \ |
| .field_exists = (_test), .vmsd = &(_vmsd), .size = sizeof(_type), \ |
| .flags = VMS_STRUCT, \ |
| .offset = vmstate_offset_value(_state, _field, _type), \ |
| } |
| |
| #define VMSTATE_STRUCT_POINTER_V(_field, _state, _version, _vmsd, _type) \ |
| { \ |
| .name = (stringify(_field)), .version_id = (_version), \ |
| .vmsd = &(_vmsd), .size = sizeof(_type *), \ |
| .flags = VMS_STRUCT | VMS_POINTER, \ |
| .offset = vmstate_offset_pointer(_state, _field, _type), \ |
| } |
| |
| #define VMSTATE_STRUCT_ARRAY_TEST(_field, _state, _num, _test, _version, \ |
| _vmsd, _type) \ |
| { \ |
| .name = (stringify(_field)), .num = (_num), .field_exists = (_test), \ |
| .version_id = (_version), .vmsd = &(_vmsd), .size = sizeof(_type), \ |
| .flags = VMS_STRUCT | VMS_ARRAY, \ |
| .offset = vmstate_offset_array(_state, _field, _type, _num), \ |
| } |
| |
| #define VMSTATE_STATIC_BUFFER(_field, _state, _version, _test, _start, _size) \ |
| { \ |
| .name = (stringify(_field)), .version_id = (_version), \ |
| .field_exists = (_test), .size = (_size - _start), \ |
| .info = &slirp_vmstate_info_buffer, .flags = VMS_BUFFER, \ |
| .offset = vmstate_offset_buffer(_state, _field) + _start, \ |
| } |
| |
| #define VMSTATE_VBUFFER_UINT32(_field, _state, _version, _test, _field_size) \ |
| { \ |
| .name = (stringify(_field)), .version_id = (_version), \ |
| .field_exists = (_test), \ |
| .size_offset = vmstate_offset_value(_state, _field_size, uint32_t), \ |
| .info = &slirp_vmstate_info_buffer, \ |
| .flags = VMS_VBUFFER | VMS_POINTER, \ |
| .offset = offsetof(_state, _field), \ |
| } |
| |
| #define QEMU_BUILD_BUG_ON_STRUCT(x) \ |
| struct { \ |
| int : (x) ? -1 : 1; \ |
| } |
| |
| #define QEMU_BUILD_BUG_ON_ZERO(x) \ |
| (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - sizeof(QEMU_BUILD_BUG_ON_STRUCT(x))) |
| |
| /* Allocate a temporary of type 'tmp_type', set tmp->parent to _state |
| * and execute the vmsd on the temporary. Note that we're working with |
| * the whole of _state here, not a field within it. |
| * We compile time check that: |
| * That _tmp_type contains a 'parent' member that's a pointer to the |
| * '_state' type |
| * That the pointer is right at the start of _tmp_type. |
| */ |
| #define VMSTATE_WITH_TMP(_state, _tmp_type, _vmsd) \ |
| { \ |
| .name = "tmp", \ |
| .size = sizeof(_tmp_type) + \ |
| QEMU_BUILD_BUG_ON_ZERO(offsetof(_tmp_type, parent) != 0) + \ |
| type_check_pointer(_state, typeof_field(_tmp_type, parent)), \ |
| .vmsd = &(_vmsd), .info = &slirp_vmstate_info_tmp, \ |
| } |
| |
| #define VMSTATE_SINGLE(_field, _state, _version, _info, _type) \ |
| VMSTATE_SINGLE_TEST(_field, _state, NULL, _version, _info, _type) |
| |
| #define VMSTATE_STRUCT(_field, _state, _version, _vmsd, _type) \ |
| VMSTATE_STRUCT_TEST(_field, _state, NULL, _version, _vmsd, _type) |
| |
| #define VMSTATE_STRUCT_POINTER(_field, _state, _vmsd, _type) \ |
| VMSTATE_STRUCT_POINTER_V(_field, _state, 0, _vmsd, _type) |
| |
| #define VMSTATE_STRUCT_ARRAY(_field, _state, _num, _version, _vmsd, _type) \ |
| VMSTATE_STRUCT_ARRAY_TEST(_field, _state, _num, NULL, _version, _vmsd, \ |
| _type) |
| |
| #define VMSTATE_INT16_V(_f, _s, _v) \ |
| VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_int16, int16_t) |
| #define VMSTATE_INT32_V(_f, _s, _v) \ |
| VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_int32, int32_t) |
| |
| #define VMSTATE_UINT8_V(_f, _s, _v) \ |
| VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_uint8, uint8_t) |
| #define VMSTATE_UINT16_V(_f, _s, _v) \ |
| VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_uint16, uint16_t) |
| #define VMSTATE_UINT32_V(_f, _s, _v) \ |
| VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_uint32, uint32_t) |
| |
| #define VMSTATE_INT16(_f, _s) VMSTATE_INT16_V(_f, _s, 0) |
| #define VMSTATE_INT32(_f, _s) VMSTATE_INT32_V(_f, _s, 0) |
| |
| #define VMSTATE_UINT8(_f, _s) VMSTATE_UINT8_V(_f, _s, 0) |
| #define VMSTATE_UINT16(_f, _s) VMSTATE_UINT16_V(_f, _s, 0) |
| #define VMSTATE_UINT32(_f, _s) VMSTATE_UINT32_V(_f, _s, 0) |
| |
| #define VMSTATE_UINT16_TEST(_f, _s, _t) \ |
| VMSTATE_SINGLE_TEST(_f, _s, _t, 0, slirp_vmstate_info_uint16, uint16_t) |
| |
| #define VMSTATE_UINT32_TEST(_f, _s, _t) \ |
| VMSTATE_SINGLE_TEST(_f, _s, _t, 0, slirp_vmstate_info_uint32, uint32_t) |
| |
| #define VMSTATE_INT16_ARRAY_V(_f, _s, _n, _v) \ |
| VMSTATE_ARRAY(_f, _s, _n, _v, slirp_vmstate_info_int16, int16_t) |
| |
| #define VMSTATE_INT16_ARRAY(_f, _s, _n) VMSTATE_INT16_ARRAY_V(_f, _s, _n, 0) |
| |
| #define VMSTATE_BUFFER_V(_f, _s, _v) \ |
| VMSTATE_STATIC_BUFFER(_f, _s, _v, NULL, 0, sizeof(typeof_field(_s, _f))) |
| |
| #define VMSTATE_BUFFER(_f, _s) VMSTATE_BUFFER_V(_f, _s, 0) |
| |
| #define VMSTATE_END_OF_LIST() \ |
| { \ |
| .flags = VMS_END, \ |
| } |
| |
| #endif /* VMSTATE_H_ */ |
