On Tue, 29 Mar 2016 16:43:45 +0100 Stefan Hajnoczi <stefanha@xxxxxxxxxx> wrote: > The VIRTIO 1.0 specification added the DEVICE_NEEDS_RESET device status > bit in "VIRTIO-98: Add DEVICE_NEEDS_RESET". This patch defines the > device status bit in the uapi header file so that both the kernel and > userspace applications can use it. > > The bit is currently unused by the virtio guest drivers and vhost. > According to the spec "a good implementation will try to recover by > issuing a reset". This is not attempted here because it requires > auditing the virtio drivers to ensure there are no resource leaks or > crashes if the device needs to be reset mid-operation. > > See "2.1 Device Status Field" in the VIRTIO 1.0 specification for > details. > > Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx> > --- > include/uapi/linux/virtio_config.h | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h > index c18264d..4cb65bb 100644 > --- a/include/uapi/linux/virtio_config.h > +++ b/include/uapi/linux/virtio_config.h > @@ -40,6 +40,8 @@ > #define VIRTIO_CONFIG_S_DRIVER_OK 4 > /* Driver has finished configuring features */ > #define VIRTIO_CONFIG_S_FEATURES_OK 8 > +/* Device entered invalid state, driver must reset it */ > +#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40 > /* We've given up on this device. */ > #define VIRTIO_CONFIG_S_FAILED 0x80 > Acked-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx> -- 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
