| 摘要 |
PURPOSE:To efficiently transfer the control from a host to a guest by storing the whole of a guest control information block at the time of issue of a virtual computer execution start instruction and storing a part of the block at the time of issue of a restart instruction. CONSTITUTION:When an input/output instruction is issued from a guest 1, a virtual computer execution start instruction processing mechanism 211 stores contents of a general register 221 and special registers 222-227 of the guest 1 in a guest control information block 20 while the control is transferred from the guest 1 to a host 10. After the control is transferred, the host 10 performs the host processing and issues the virtual computer execution restart instruction. When the restart instruction is issued, a virtual computer execution restart instruction processing mechanism 212 stores a part of contents of the general register and special registers of the guest 1 which is designated by the instruction, and the control is transferred to the guest. Thus, the control is efficiently transferred from the host to the guest running just before. |
