Re: Outline for VHOST_USER_PROTOCOL_F_VDPA

[Michael S. Tsirkin]

On Wed, Sep 30, 2020 at 03:57:52PM +0100, Stefan Hajnoczi wrote:
> IMO "Inflight I/O tracking" is best placed into libvhost-user instead of
> the vhost-user protocol.

Oh I agree qemu does nothing with it. The reason we have it defined in
the spec is to facilitate compatibility across backends.
I have zero confidence in backend developers being able to support
e.g. cross-version migration consistently, and lots of backends
do not use libvhost-user.