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Subject: Re: [RFC virtio-dev] vhost-user-slave: add vhost-user slave device type

On Fri, Dec 15, 2017 at 05:05:19PM +0000, Stefan Hajnoczi wrote:
> The vhost-user slave device facilitates vhost-user device emulation
> through vhost-user protocol exchanges and access to shared memory.
> Software-defined networking, storage, and other I/O appliances can
> provide services through this device.
> This device is based on Wei Wang's vhost-pci work.  The vhost-user slave
> device differs from vhost-pci because it is a single virtio device type
> that exposes the vhost-user protocol instead of a family of new virtio
> device types, one for each vhost-user device type.
> This device supports vhost-user slave and vhost-user master
> reconnection.  It also contains a UUID so that vhost-user slave programs
> can identify a specific device among many without using bus addresses.
> It is somewhat unconventional for a virtio device because it makes use
> of additional resources called doorbells, notifications, and shared
> memory.  A mapping of these resources to the virtio PCI transport is
> provided.  Other transports, such as CCW may not be able to support
> this device.

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