VM_REG_CMD
frame->ecx = VM_REG_CMD(0xffff, cmd);
frame->edx = VM_REG_CMD(0, VM_PORT_CMD);
frame.edx = VM_REG_CMD(0, VM_PORT_CMD);
frame.ecx = VM_REG_CMD(0, cmd);
#define VM_REG_CMD_RPC(cmd) VM_REG_CMD((cmd), VM_CMD_RPC)
#define VM_REG_PORT_CMD(cmd) VM_REG_CMD((cmd), VM_PORT_CMD)
#define VM_REG_PORT_RPC(cmd) VM_REG_CMD((cmd), VM_PORT_RPC)