As it was discussed recently, there's currently no way for the guest to notify the host about panics. Further more, there's no reasonable way to notify the host of other critical events such as an OOM kill.
This short patch series introduces a new device named virtio-notifier which does two simple things: 1. Provide a simple interface for the guest to notify the host of critical events. This is easily expandible to add support for any events we may find interesting for the host to know about. 2. Provide an "echo" interface for the host to ping the guest. This allows the host to ping the guest at intervals chosen by the host, and act accordingly if no response has been received. Sasha Levin (2): virtio: Introduce virtio-notifier kvm tools: support virtio-notifier drivers/virtio/Kconfig | 11 ++ drivers/virtio/Makefile | 1 + drivers/virtio/virtio_notifier.c | 135 ++++++++++++++++++++ include/linux/virtio_ids.h | 1 + include/linux/virtio_notifier.h | 15 +++ tools/kvm/Makefile | 1 + tools/kvm/builtin-run.c | 6 + tools/kvm/include/kvm/virtio-notifier.h | 9 ++ tools/kvm/include/kvm/virtio-pci-dev.h | 1 + tools/kvm/virtio/notifier.c | 203 +++++++++++++++++++++++++++++++ 10 files changed, 383 insertions(+), 0 deletions(-) create mode 100644 drivers/virtio/virtio_notifier.c create mode 100644 include/linux/virtio_notifier.h create mode 100644 tools/kvm/include/kvm/virtio-notifier.h create mode 100644 tools/kvm/virtio/notifier.c -- 1.7.8.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
