New VMstate save/load infrastructure
This patch introduces VMState infrastructure, to convert the save/load functions of devices to a table approach. This new approach has the following advantages: - it is type-safe - you can't have load/save functions out of sync - will allows us to have new interesting commands, like dump <device>, that shows all its internal state. - Just now, the only added type is arrays, but we can add structures. - Uses old load_state() function for loading old state. Signed-off-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Juan Quintela
Anthony Liguori
parent
4082be4df4
commit
9ed7d6ae0f
102
hw/hw.h
102
hw/hw.h
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@ -270,4 +270,106 @@ typedef int QEMUBootSetHandler(void *opaque, const char *boot_devices);
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void qemu_register_boot_set(QEMUBootSetHandler *func, void *opaque);
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int qemu_boot_set(const char *boot_devices);
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typedef struct VMStateInfo VMStateInfo;
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typedef struct VMStateDescription VMStateDescription;
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struct VMStateInfo {
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const char *name;
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int (*get)(QEMUFile *f, void *pv, size_t size);
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void (*put)(QEMUFile *f, const void *pv, size_t size);
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};
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enum VMStateFlags {
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VMS_SINGLE = 0x001,
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};
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typedef struct {
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const char *name;
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size_t offset;
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size_t size;
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const VMStateInfo *info;
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enum VMStateFlags flags;
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int version_id;
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} VMStateField;
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struct VMStateDescription {
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const char *name;
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int version_id;
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int minimum_version_id;
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int minimum_version_id_old;
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LoadStateHandler *load_state_old;
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VMStateField *fields;
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};
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extern const VMStateInfo vmstate_info_int8;
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extern const VMStateInfo vmstate_info_int16;
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extern const VMStateInfo vmstate_info_int32;
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extern const VMStateInfo vmstate_info_int64;
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extern const VMStateInfo vmstate_info_uint8;
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extern const VMStateInfo vmstate_info_uint16;
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extern const VMStateInfo vmstate_info_uint32;
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extern const VMStateInfo vmstate_info_uint64;
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#define VMSTATE_SINGLE(_field, _state, _version, _info, _type) { \
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.name = (stringify(_field)), \
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.version_id = (_version), \
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.size = sizeof(_type), \
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.info = &(_info), \
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.flags = VMS_SINGLE, \
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.offset = offsetof(_state, _field) \
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+ type_check(_type,typeof_field(_state, _field)) \
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}
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/* _f : field name
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_s : struct state name
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_v : version
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*/
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#define VMSTATE_INT8_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_int8, int8_t)
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#define VMSTATE_INT16_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_int16, int16_t)
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#define VMSTATE_INT32_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_int32, int32_t)
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#define VMSTATE_INT64_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_int64, int64_t)
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#define VMSTATE_UINT8_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_uint8, uint8_t)
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#define VMSTATE_UINT16_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_uint16, uint16_t)
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#define VMSTATE_UINT32_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_uint32, uint32_t)
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#define VMSTATE_UINT64_V(_f, _s, _v) \
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VMSTATE_SINGLE(_f, _s, _v, vmstate_info_uint64, uint64_t)
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#define VMSTATE_INT8(_f, _s) \
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VMSTATE_INT8_V(_f, _s, 0)
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#define VMSTATE_INT16(_f, _s) \
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VMSTATE_INT16_V(_f, _s, 0)
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#define VMSTATE_INT32(_f, _s) \
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VMSTATE_INT32_V(_f, _s, 0)
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#define VMSTATE_INT64(_f, _s) \
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VMSTATE_INT64_V(_f, _s, 0)
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#define VMSTATE_UINT8(_f, _s) \
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VMSTATE_UINT8_V(_f, _s, 0)
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#define VMSTATE_UINT16(_f, _s) \
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VMSTATE_UINT16_V(_f, _s, 0)
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#define VMSTATE_UINT32(_f, _s) \
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VMSTATE_UINT32_V(_f, _s, 0)
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#define VMSTATE_UINT64(_f, _s) \
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VMSTATE_UINT64_V(_f, _s, 0)
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#define VMSTATE_END_OF_LIST() \
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{}
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extern int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
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void *opaque, int version_id);
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extern void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
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const void *opaque);
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extern int vmstate_register(int instance_id, const VMStateDescription *vmsd,
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void *base);
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extern void vmstate_unregister(const char *idstr, void *opaque);
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#endif
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273
savevm.c
273
savevm.c
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@ -639,6 +639,174 @@ uint64_t qemu_get_be64(QEMUFile *f)
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return v;
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}
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/* 8 bit int */
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static int get_int8(QEMUFile *f, void *pv, size_t size)
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{
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int8_t *v = pv;
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qemu_get_s8s(f, v);
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return 0;
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}
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static void put_int8(QEMUFile *f, const void *pv, size_t size)
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{
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const int8_t *v = pv;
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qemu_put_s8s(f, v);
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}
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const VMStateInfo vmstate_info_int8 = {
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.name = "int8",
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.get = get_int8,
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.put = put_int8,
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};
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/* 16 bit int */
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static int get_int16(QEMUFile *f, void *pv, size_t size)
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{
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int16_t *v = pv;
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qemu_get_sbe16s(f, v);
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return 0;
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}
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static void put_int16(QEMUFile *f, const void *pv, size_t size)
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{
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const int16_t *v = pv;
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qemu_put_sbe16s(f, v);
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}
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const VMStateInfo vmstate_info_int16 = {
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.name = "int16",
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.get = get_int16,
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.put = put_int16,
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};
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/* 32 bit int */
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static int get_int32(QEMUFile *f, void *pv, size_t size)
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{
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int32_t *v = pv;
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qemu_get_sbe32s(f, v);
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return 0;
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}
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static void put_int32(QEMUFile *f, const void *pv, size_t size)
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{
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const int32_t *v = pv;
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qemu_put_sbe32s(f, v);
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}
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const VMStateInfo vmstate_info_int32 = {
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.name = "int32",
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.get = get_int32,
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.put = put_int32,
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};
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/* 64 bit int */
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static int get_int64(QEMUFile *f, void *pv, size_t size)
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{
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int64_t *v = pv;
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qemu_get_sbe64s(f, v);
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return 0;
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}
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static void put_int64(QEMUFile *f, const void *pv, size_t size)
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{
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const int64_t *v = pv;
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qemu_put_sbe64s(f, v);
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}
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const VMStateInfo vmstate_info_int64 = {
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.name = "int64",
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.get = get_int64,
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.put = put_int64,
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};
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/* 8 bit unsigned int */
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static int get_uint8(QEMUFile *f, void *pv, size_t size)
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{
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uint8_t *v = pv;
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qemu_get_8s(f, v);
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return 0;
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}
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static void put_uint8(QEMUFile *f, const void *pv, size_t size)
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{
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const uint8_t *v = pv;
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qemu_put_8s(f, v);
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}
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const VMStateInfo vmstate_info_uint8 = {
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.name = "uint8",
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.get = get_uint8,
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.put = put_uint8,
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};
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/* 16 bit unsigned int */
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static int get_uint16(QEMUFile *f, void *pv, size_t size)
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{
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uint16_t *v = pv;
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qemu_get_be16s(f, v);
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return 0;
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}
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static void put_uint16(QEMUFile *f, const void *pv, size_t size)
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{
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const uint16_t *v = pv;
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qemu_put_be16s(f, v);
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}
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const VMStateInfo vmstate_info_uint16 = {
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.name = "uint16",
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.get = get_uint16,
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.put = put_uint16,
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};
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/* 32 bit unsigned int */
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static int get_uint32(QEMUFile *f, void *pv, size_t size)
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{
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uint32_t *v = pv;
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qemu_get_be32s(f, v);
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return 0;
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}
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static void put_uint32(QEMUFile *f, const void *pv, size_t size)
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{
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const uint32_t *v = pv;
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qemu_put_be32s(f, v);
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}
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const VMStateInfo vmstate_info_uint32 = {
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.name = "uint32",
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.get = get_uint32,
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.put = put_uint32,
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};
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/* 64 bit unsigned int */
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static int get_uint64(QEMUFile *f, void *pv, size_t size)
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{
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uint64_t *v = pv;
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qemu_get_be64s(f, v);
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return 0;
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}
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static void put_uint64(QEMUFile *f, const void *pv, size_t size)
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{
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const uint64_t *v = pv;
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qemu_put_be64s(f, v);
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}
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const VMStateInfo vmstate_info_uint64 = {
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.name = "uint64",
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.get = get_uint64,
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.put = put_uint64,
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};
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typedef struct SaveStateEntry {
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char idstr[256];
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int instance_id;
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@ -647,11 +815,13 @@ typedef struct SaveStateEntry {
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SaveLiveStateHandler *save_live_state;
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SaveStateHandler *save_state;
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LoadStateHandler *load_state;
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const VMStateDescription *vmsd;
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void *opaque;
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struct SaveStateEntry *next;
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} SaveStateEntry;
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static SaveStateEntry *first_se;
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static int global_section_id;
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/* TODO: Individual devices generally have very little idea about the rest
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of the system, so instance_id should be removed/replaced.
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@ -666,7 +836,6 @@ int register_savevm_live(const char *idstr,
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void *opaque)
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{
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SaveStateEntry *se, **pse;
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static int global_section_id;
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se = qemu_malloc(sizeof(SaveStateEntry));
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pstrcpy(se->idstr, sizeof(se->idstr), idstr);
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@ -677,6 +846,7 @@ int register_savevm_live(const char *idstr,
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se->save_state = save_state;
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se->load_state = load_state;
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se->opaque = opaque;
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se->vmsd = NULL;
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se->next = NULL;
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/* add at the end of list */
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@ -719,17 +889,110 @@ void unregister_savevm(const char *idstr, void *opaque)
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}
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}
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int vmstate_register(int instance_id, const VMStateDescription *vmsd,
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void *opaque)
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{
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SaveStateEntry *se, **pse;
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se = qemu_malloc(sizeof(SaveStateEntry));
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pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
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se->instance_id = (instance_id == -1) ? 0 : instance_id;
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se->version_id = vmsd->version_id;
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se->section_id = global_section_id++;
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se->save_live_state = NULL;
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se->save_state = NULL;
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se->load_state = NULL;
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se->opaque = opaque;
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se->vmsd = vmsd;
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se->next = NULL;
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/* add at the end of list */
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pse = &first_se;
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while (*pse != NULL) {
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if (instance_id == -1
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&& strcmp(se->idstr, (*pse)->idstr) == 0
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&& se->instance_id <= (*pse)->instance_id)
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se->instance_id = (*pse)->instance_id + 1;
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pse = &(*pse)->next;
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}
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*pse = se;
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return 0;
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}
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void vmstate_unregister(const char *idstr, void *opaque)
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{
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SaveStateEntry **pse;
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pse = &first_se;
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while (*pse != NULL) {
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if (strcmp((*pse)->idstr, idstr) == 0 && (*pse)->opaque == opaque) {
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SaveStateEntry *next = (*pse)->next;
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qemu_free(*pse);
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*pse = next;
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continue;
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}
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pse = &(*pse)->next;
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}
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}
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int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
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void *opaque, int version_id)
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{
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VMStateField *field = vmsd->fields;
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if (version_id > vmsd->version_id) {
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return -EINVAL;
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}
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if (version_id < vmsd->minimum_version_id_old) {
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return -EINVAL;
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}
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if (version_id < vmsd->minimum_version_id) {
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return vmsd->load_state_old(f, opaque, version_id);
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}
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while(field->name) {
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if (field->version_id <= version_id) {
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void *addr = opaque + field->offset;
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int ret;
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ret = field->info->get(f, addr, field->size);
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if (ret < 0) {
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return ret;
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}
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}
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field++;
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}
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return 0;
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}
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void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
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const void *opaque)
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{
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VMStateField *field = vmsd->fields;
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while(field->name) {
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const void *addr = opaque + field->offset;
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field->info->put(f, addr, field->size);
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field++;
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}
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}
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static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
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{
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return se->load_state(f, se->opaque, version_id);
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if (!se->vmsd) { /* Old style */
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return se->load_state(f, se->opaque, version_id);
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}
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return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
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}
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static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
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{
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se->save_state(f, se->opaque);
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if (!se->vmsd) { /* Old style */
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se->save_state(f, se->opaque);
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return;
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}
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vmstate_save_state(f,se->vmsd, se->opaque);
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}
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#define QEMU_VM_FILE_MAGIC 0x5145564d
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#define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
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#define QEMU_VM_FILE_VERSION 0x00000003
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@ -817,7 +1080,7 @@ int qemu_savevm_state_complete(QEMUFile *f)
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for(se = first_se; se != NULL; se = se->next) {
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int len;
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if (se->save_state == NULL)
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if (se->save_state == NULL && se->vmsd == NULL)
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continue;
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/* Section type */
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