Hello, I am trying to synchronize processing of certain network event with guest VM. For the event, I want to pause a running VM; process event in thread X and resume VM. I want to do this from KVM kernel module code (not qemu). I tried couple of approaches (mentioned below) but it allows me to pause VM after guest yields cpu voluntarily - which is not immediate. I could not find a way to force guest VM to pause. Any signals that it would respond to pause ? I understand vcpu_enter_guest() called from __vcpu_run() is the function where its actually executing guest VM. I am working with the same functions. Guest VM being just another process for kernel, following is the approach I tried A. When the event occurs, make thread X sleep on waitqueue1 and set some atomic flag F. In __vcpu_run(), before it checks if need_resched() is true; check if above atomic flag F is true. If true, make VM thread sleep on waitqueue2 and wake-up waitqueue1. Process the event and wake-up waitqueue2 B. Also tried setting need_resched of VM process using set_tsk_need_resched() and if flag F is true, mark state as TASK_INTERRUPTIBLE a common approach used for scheduling out process. But both these waits till VM co-operates. Is there any way to pause guest VM forcibly ? -- Sunil -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
