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path: root/src/cpu/kvm/KvmVM.py
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2013-04-22kvm: Basic support for hardware virtualized CPUsAndreas Sandberg
This changeset introduces the architecture independent parts required to support KVM-accelerated CPUs. It introduces two new simulation objects: KvmVM -- The KVM VM is a component shared between all CPUs in a shared memory domain. It is typically instantiated as a child of the system object in the simulation hierarchy. It provides access to KVM VM specific interfaces. BaseKvmCPU -- Abstract base class for all KVM-based CPUs. Architecture dependent CPU implementations inherit from this class and implement the following methods: * updateKvmState() -- Update the architecture-dependent KVM state from the gem5 thread context associated with the CPU. * updateThreadContext() -- Update the thread context from the architecture-dependent KVM state. * dump() -- Dump the KVM state using (optional). In order to deliver interrupts to the guest, CPU implementations typically override the tick() method and check for, and deliver, interrupts prior to entering KVM. Hardware-virutalized CPU currently have the following limitations: * SE mode is not supported. * PC events are not supported. * Timing statistics are currently very limited. The current approach simply scales the host cycles with a user-configurable factor. * The simulated system must not contain any caches. * Since cycle counts are approximate, there is no way to request an exact number of cycles (or instructions) to be executed by the CPU. * Hardware virtualized CPUs and gem5 CPUs must not execute at the same time in the same simulator instance. * Only single-CPU systems can be simulated. * Remote GDB connections to the guest system are not supported. Additionally, m5ops requires an architecture specific interface and might not be supported.