On Tue, Oct 18, 2016 at 12:23:59PM +0300, Marc-André Lureau wrote: > Hi > > vhost-user & virtio have tricky corners and evolve regularly. There > isn't a reference code that would help you get started either. And the > backends duplicate most of the effort.
I had to drop this as it got nacked for this release by Stefan. Sorry about that. Pls ping or repost after the release. > Furthermore, due to usage of ancillary data, shared memory, eventfd, > atomics, it is not so simple to implement in other languages than C > either. Having a library doing the low-level parts could eventually > help to reach other languages (this guided some decisions, such as > being able to override message handling) > > I found it would help me to experiment with new usages of > libvhost-user (with other devices than network for example) if qemu > would provide such "reference" library. vhost-user-bridge was the most > complete attempt at implementing vhost-user slave in qemu, but it > lacked some abstraction and efficient handling of the virt queues. > > I propose to provide such library based on virtio.c implementation and > vhost-user-bridge socket handling. It is not meant to be complete, or > solve all use cases (best efficiency, or multi-threading support are > not a goal for this first implementation). My hope is that at some > point the library would be complete and stable enough that it could > become a standalone project, that could cover most use cases. For now > it makes more sense to propose it in qemu/contrib as an internal > library where API could evolve. > > Comments welcome! > > v2: > - add documentation > - updated to follow latest virtio queue qemu implementation > - rename add_watch() to set_watch() > - various fixes from Felipe Franciosi > > rfc->v1: > - add vu_gpa_to_va() > - fix indirect descriptors handling > - fix notification > - more error handling > - disable debugging > > Marc-André Lureau (6): > tests/vhost-user-bridge: remove false comment > tests/vhost-user-bridge: remove unnecessary dispatcher_remove > tests/vhost-user-bridge: indicate peer disconnected > tests/vhost-user-bridge: do not accept more than one connection > contrib: add libvhost-user > tests/vhost-user-bridge: use contrib/libvhost-user > > contrib/libvhost-user/libvhost-user.c | 1499 > +++++++++++++++++++++++++++++++++ > tests/vhost-user-bridge.c | 1183 +++++--------------------- > Makefile | 1 + > Makefile.objs | 2 +- > contrib/libvhost-user/Makefile.objs | 1 + > tests/Makefile.include | 2 +- > contrib/libvhost-user/libvhost-user.h | 435 ++++++++++ > 7 files changed, 2167 insertions(+), 956 deletions(-) > create mode 100644 contrib/libvhost-user/libvhost-user.c > create mode 100644 contrib/libvhost-user/Makefile.objs > create mode 100644 contrib/libvhost-user/libvhost-user.h > > -- > 2.10.0
