search for: hypervisor_device_op

...o ensure isolation. We need to add  these new hypercalls for communication between the guest device driver and the hypervisor. The guest device drivers use these hypercalls to read the state of the current physical device and also request the ownership of the device. We need following hypercalls: HYPERVISOR_device_op, get device state. Before the device driver accesses the device, it first issues this hypercall to check the state of the device. The state could be “idle” or “busy”. “Idle” means no other guest is currently using the device. “busy” means other guest is using the device. We may use just one char or...