Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu

[Paolo Bonzini]

> > > Sure.  nbd+unix:///exportname?socket=path is the new URI syntax, I
> > > honestly forgot the old one.  SCM_CREDENTIALS checks (qemu-nbd --pid
> > > or something like that) is not supported, but patches would be
> > > very welcome.
> > 
> > Yes, this is better than my tcp suggestion.
> 
> So if I want to use the code from nbd.c, I need to write a specialized
> BlockDriver for the vma format (to pass that to nbd_export_new())?

Yes.  But I believe that would be a good thing to do anyway.  For one
thing, it gives you "automatic" coverage via qemu-iotests.

Paolo