1. A method for making a decision about virtual machine migration, comprising: receiving a migration request sent from a source host platform of a virtual machine to be migrated; performing security checks on the source host platform of the virtual machine to be migrated and a target host platform of the virtual machine to be migrated according to the migration request, to obtain a first evaluation result of the source host platform and a second evaluation result of the target host platform; acquiring a third evaluation result of the virtual machine to be migrated; and returning a corresponding migration decision-making result to the source host platform according to the first evaluation result, the second evaluation result, and the third evaluation result, wherein the corresponding migration decision-making result indicates whether the virtual machine is permitted to be migrated.