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.
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.
This is also backward compatible for s390 and x86.
Shannon Zhao (4):
hw/s390x/virtio-ccw: Add virtio_ccw_device_plugged for virtio-ccw
hw/s390x/s390-virtio-bus: Add virtio_s390_device_plugged for
s390-virtio
hw/net/virtio-net: Move DEFINE_VIRTIO_NET_FEATURES to virtio-net
virtio-scsi: Move DEFINE_VIRTIO_SCSI_FEATURES to virtio-scsi
hw/net/virtio-net.c | 4 ++++
hw/s390x/s390-virtio-bus.c | 12 ++++++++++--
hw/s390x/virtio-ccw.c | 13 +++++++++++--
hw/scsi/virtio-scsi.c | 5 +++++
hw/virtio/virtio-pci.c | 2 --
include/hw/virtio/virtio-net.h | 1 +
include/hw/virtio/virtio-scsi.h | 1 +
7 files changed, 32 insertions(+), 6 deletions(-)
--
2.0.4
