This patchset sets the stage for extending the vhost user protocol, with full backwards compatibility.
The approach is to negotiate feature bits queried and acknowledged during device setup. For now, there's no new functionality: two new messages are added that will allow negotiating new messages required for functionality such as MQ and migration. For now, I used the feature bit 30 to signal support for these new messages, and we now have 64 more bits to play. The patches can be found in my tree, branch vhost-user. Only patch 1 is intended for 2.4. Posting early so people working on extensions such as migration can review this - but please note the protocol is not set in stone yet. Michael S. Tsirkin (4): Revert "vhost-user: add multi queue support" vhost-user: refactor ioctl translation vhost-user: add protocol feature negotiation vhost-user: unit test for new messages qapi-schema.json | 6 +- include/hw/virtio/vhost.h | 1 + hw/net/vhost_net.c | 5 +- hw/virtio/vhost-user.c | 150 ++++++++++++++++++++++++++++++---------------- net/vhost-user.c | 37 ++++-------- tests/vhost-user-test.c | 19 ++++++ docs/specs/vhost-user.txt | 40 +++++++++++-- qemu-options.hx | 5 +- 8 files changed, 174 insertions(+), 89 deletions(-) -- MST