virtio-net: 64 bit features, event index

OK, here's a patch that implements the virtio spec update that I sent earlier. It supercedes the PUBLISH_USED_IDX patches I sent out earlier.

Support is added in both userspace and vhost-net.

If you see issues or are just curious, you can
turn the new feature off. For example:

-global virtio-net-pci.event_idx=on
-global virtio-blk-pci.event_idx=off

Also, it's possible to try both vhost-net and virtio-net.

Another part is adding support for 64 bit features in place. The high bits are actually unused, to test hack qemu to set some high bit.

linux code is here:
git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost-net-next-event-idx-v3
git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git virtio-net-event-idx-v3

Changes from v1:
- unify used and avail ring handling in a single feature bit
- copy avail event idx fix from vhost-net

Michael S. Tsirkin (2):
virtio/vhost: support 64 bit features
virtio+vhost: event idx feature

 hw/qdev-properties.c   |   39 +++++++++++++---
 hw/qdev.h              |   10 ++++
 hw/s390-virtio-bus.c   |    5 +-
 hw/s390-virtio-bus.h   |    2 +-
 hw/syborg_virtio.c     |    7 ++-
 hw/vhost_net.c         |   14 ++++--
 hw/vhost_net.h         |    4 +-
 hw/virtio-9p.c         |    2 +-
 hw/virtio-balloon.c    |    2 +-
 hw/virtio-blk.c        |    2 +-
 hw/virtio-blk.h        |    2 +-
 hw/virtio-net.c        |   11 +++--
 hw/virtio-net.h        |   34 +++++++-------
 hw/virtio-pci.c        |   91 +++++++++++++++++++++++++++----------
 hw/virtio-serial-bus.c |    2 +-
 hw/virtio.c            |  116 ++++++++++++++++++++++++++++++++++++++++++------
 hw/virtio.h            |   24 +++++++---
 17 files changed, 275 insertions(+), 92 deletions(-)

1.7.5.53.gc233e