Hypervisor communication congestion control in a vehicle during virtual machine activation
A control device is mountable on a vehicle. The control device includes a memory, and a hardware processor coupled to the memory. The hardware processor is configured to implement a first hypervisor and a second hypervisor. The first hypervisor controls execution of a first virtual machine. The second hypervisor performs communication with the first hypervisor via a gateway and controls execution of a second virtual machine. The hardware processor is configured to dynamically limit at least one of a communication traffic of application communication or a communication traffic of evaluation and verification communication, based on the application communication executed between the first hypervisor and the second hypervisor, and the evaluation and verification communication executed between the first hypervisor and the second hypervisor during activation of the first virtual machine and the second virtual machine, and based on a communication capacity of the gateway.
1 . A control device mountable on a vehicle, comprising:
a memory; and
a hardware processor coupled to the memory, the hardware processor being configured to:
implement a first hypervisor that controls execution of a first virtual machine and a second hypervisor that performs communication with the first hypervisor via a gateway and controls execution of a second virtual machine; and
dynamically limit at least one of a communication traffic of application communication and a communication traffic of evaluation and verification communication based on the application communication executed between the first hypervisor and the second hypervisor, the evaluation and verification communication executed between the first hypervisor and the second hypervisor during activation of the first virtual machine and the second virtual machine, and a communication capacity of the gateway.
2 . The control device according to claim 1 , wherein
the hardware processor is configured to perform control in such a way that the total value of the communication traffic of the application communication and the communication traffic of the evaluation and verification communication does not exceed the communication capacity of the gateway, in a case where a total value of the communication traffic of the application communication and the communication traffic of the evaluation and verification communication between the first hypervisor and the second hypervisor during the activation of the first virtual machine and the second virtual machine strains the communication capacity of the gateway.
3 . The control device according to claim 2 , wherein
the hardware processor is configured to determine whether or not the communication capacity of the gateway is strained based on a congestion control signal indicating that a communication traffic of the gateway exceeds a threshold.
4 . The control device according to claim 3 , wherein the hardware processor is configured to prioritize the application communication in a case where a communication control unit acquires the congestion control signal.
5 . The control device according to claim 1 , wherein
the hardware processor is further configured to transfer an execution state and an execution content of a virtual CPU for evaluation and verification from the first hypervisor to the second hypervisor before the activation of the first virtual machine and the second virtual machine.
6 . The control device according to claim 5 , wherein
the hardware processor is further configured to virtually generate a device subordinate to the second hypervisor that receives the execution state and the execution content of the virtual CPU for evaluation and verification, in a case where there is no device that is used by the virtual CPU and is subordinate to the second hypervisor.
7 . The control device according to claim 1 , wherein the hardware processor is configured to suspend operations of the first virtual machine and the second virtual machine and perform transmission of uncommunicated data between the first hypervisor and the second hypervisor, in a case where an amount of untransmitted data between the first hypervisor and the second hypervisor is equal to or more than a predetermined value.
8 . The control device according to claim 7 , wherein
the hardware processor is configured to resume the operations of the first virtual machine and the second virtual machine, in a case where the amount of untransmitted data between the first hypervisor and the second hypervisor falls below the predetermined value.
9 . The control device according to claim 1 , wherein
the hardware processor is further configured to implement a virtual machine that performs communication with the first hypervisor to execute a part of processing to be executed by the first hypervisor by proxy.
10 . A control system mountable on a vehicle, comprising a memory; and
a hardware processor coupled to the memory, the hardware processor being configured to:
implement a first hypervisor that controls execution of a first virtual machine, and
a second hypervisor that performs communication with the first hypervisor via a gateway and controls execution of a second virtual machine; and
dynamically limit at least one of a communication traffic of application communication and a communication traffic of evaluation and verification communication based on an execution status of the application communication executed between the first hypervisor and the second hypervisor, an execution status of the evaluation and verification communication executed between the first hypervisor and the second hypervisor during activation of the first virtual machine and the second virtual machine, and a communication capacity of the gateway.
11 . A control method executed by a control device that is mountable on a vehicle, includes a first hypervisor that controls execution of a first virtual machine, and a second hypervisor that performs communication with the first hypervisor via a gateway and controls execution of a second virtual machine, the control method comprising:
dynamically limiting at least one of a communication traffic of application communication and a communication traffic of evaluation and verification communication based on an execution status of the application communication executed between the first hypervisor and the second hypervisor, an execution status of the evaluation and verification communication executed between the first hypervisor and the second hypervisor during activation of the first virtual machine and the second virtual machine, and a communication capacity of the gateway.