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vmstate: add VMS_MUST_EXIST

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Can be used to verify a required field exists or validate
state in some other way.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-04-03 19:50:31 +03:00 committed by Juan Quintela
parent 35fc1f7189
commit 5bf81c8d63
2 changed files with 11 additions and 0 deletions
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1
include/migration/vmstate.h
View File

@ -100,6 +100,7 @@ enum VMStateFlags {
VMS_MULTIPLY = 0x200, /* multiply "size" field by field_size */ VMS_MULTIPLY = 0x200, /* multiply "size" field by field_size */
VMS_VARRAY_UINT8 = 0x400, /* Array with size in uint8_t field*/ VMS_VARRAY_UINT8 = 0x400, /* Array with size in uint8_t field*/
VMS_VARRAY_UINT32 = 0x800, /* Array with size in uint32_t field*/ VMS_VARRAY_UINT32 = 0x800, /* Array with size in uint32_t field*/
VMS_MUST_EXIST = 0x1000, /* Field must exist in input */
}; };
typedef struct { typedef struct {

10
vmstate.c
View File

@ -102,6 +102,10 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
return ret; return ret;
} }
} }
} else if (field->flags & VMS_MUST_EXIST) {
fprintf(stderr, "Input validation failed: %s/%s\n",
vmsd->name, field->name);
return -1;
} }
field++; field++;
} }
@ -142,6 +146,12 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
field->info->put(f, addr, size); field->info->put(f, addr, size);
} }
} }
} else {
if (field->flags & VMS_MUST_EXIST) {
fprintf(stderr, "Output state validation failed: %s/%s\n",
vmsd->name, field->name);
assert(!(field->flags & VMS_MUST_EXIST));
}
} }
field++; field++;
} }