On Thu, Oct 19, 2017 at 05:43:18PM +0200, Paolo Bonzini wrote: > On 19/10/2017 17:39, Michael S. Tsirkin wrote: > >> Add VHOST_USER_GET_CONFIG/VHOST_USER_SET_CONFIG messages which can be > >> used for live migration of vhost user devices, also vhost user devices > >> can benefit from the messages to get/set virtio config space from/to the > >> I/O target. For the purpose to support virtio config space change, > >> VHOST_USER_SET_CONFIG_FD message is added as the event notifier > >> in case virtio config space change in the I/O target. > >> > >> Signed-off-by: Changpeng Liu <changpeng....@intel.com> > > I don't much like it that config is getting passed through. > > > > IMO this makes managing things harder not easier. > > > > How about specific messages about specific parts of > > config space that you want to get from the backend? > > In the case of virtio-blk that would be all of it. Do you have a case > in mind where some part of the configuration space is owned by QEMU? > > Paolo
Yes. seg_max
