On 30-Nov-17 6:44 PM, Jianfeng Tan wrote:
This patchset adds a generic channel for multi-process (primary/secondary)
communication.
Patch 1: addess the purpose and howto;
Patch 2: add a syncrhonous way for those messages which need a response
immediately.
Patch 3: Rework vfio to use this generic communication channel.
Hi Jianfeng,
Just a general comment: I am assuming this has the limitation of
"everything happens through primary process's involvement". This will
work for VFIO, as secondary always needs to ask the primary before doing
anything, but it doesn't address other issues that could have been
addressed with IPC.
For example, if a primary process would've hotplugged a device, it can't
notify all secondary processes about this; rather, it has to wait until
secondary processes ask for this info. Neither can it do anything if
secondary requests a primary to do something, and notify other secondary
processes about it (i.e. if secondary wants to hotplug a device, but
there are other secondaries also running). It would be great to have a
standard way of doing things like this in future revisions of our IPC.
--
Thanks,
Anatoly
