Virtual computer system having a first virtual computer that executes a protected process, a second virtual computer that executes an unprotected process, and a hypervisor that controls the first and second virtual computers

Abstract

When a process judging unit judges that a target process is a protected process, a key judging unit judges whether a target key that is a key generated by a key generating unit is a first key or a second key. When the key judging unit judges that the target key is the first key, a VM communication managing unit notifies the target process of a memory ID of a protected memory region corresponding to the first key. When the process judging unit judges that the target process is an unprotected process, a key transforming unit transforms the target key from the first key to the second key based on the key transformation rule. An HV communication managing unit notifies the target process of a memory ID of an unprotected memory region corresponding to the second key.