[Qemu-devel] [PATCHv2-RFC 0/2] qemu: properties for feature compatibility

[Michael S. Tsirkin]

Here's what I came up with for solving the problem of differences in
features in virtio between 0.12 and 0.11.  This also enables migration
between different backends, e.g.  between host where tap supports virtio
net header and where it does not: management just needs to set features
appropriately.

Changes since RFC:
- add symbolic names for properties
- only optional features can be changed
Comments? Gerd, what do you think?



Michael S. Tsirkin (2):
  qdev: add bit property type
  virtio: add features as qdev properties

 hw/qdev-properties.c |   70 +++++++++++++++++++++++++++++++++++++++++++++-----
 hw/qdev.h            |    9 ++++++
 hw/syborg_virtio.c   |   12 +++++---
 hw/virtio-balloon.c  |    4 +-
 hw/virtio-blk.c      |   10 ++-----
 hw/virtio-blk.h      |   10 +++++++
 hw/virtio-console.c  |    4 +-
 hw/virtio-net.c      |   39 +++++++++++----------------
 hw/virtio-net.h      |   20 ++++++++++++++
 hw/virtio-pci.c      |   25 ++++++++++++-----
 hw/virtio.c          |    2 +-
 hw/virtio.h          |    7 ++++-
 12 files changed, 156 insertions(+), 56 deletions(-)