On 28 April 2015 at 12:51, <shannon.z...@linaro.org> wrote: > From: Shannon Zhao <shannon.z...@linaro.org> > > The reason to do this is that the virtio-net-device can't expose host > features to guest while using virtio-mmio. So the performance is low. > > The virtio-*-pci, virtio-*-s390, and virtio-*-ccw already have the > ability to forward property accesses to the backend child, by calling > *_virtio_*_instance_init -> qdev_alias_all_properties. So if we move the > host features to backends, it doesn't break the backwards compatibility > for virtio-*-pci, virtio-*-s390, and virtio-*-ccw. > > Here we move the host features to backends, involving > DEFINE_VIRTIO_NET_FEATURES, DEFINE_VIRTIO_SCSI_FEATURES. So the > virtio-mmio devices could have the host freatures, and this has a great > performance improvement to virtio-mmio, especially to virtio-net-device.
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org> (but not tested :-)) thanks -- PMM
