Re: [PATCH v7 12/21] multi-process: Connect Proxy Object with device in the remote process

[Michael S. Tsirkin]

On Mon, Jul 27, 2020 at 02:18:29PM +0100, Stefan Hajnoczi wrote:
> I suggest dropping multi-device support for now. It will be implemented
> differently with VFIO-over-socket anyway, so it's not worth investing
> much time into.

I'm not sure I buy the VFIO-over-socket yet. It seems a weirdly QEMU
specific IPC mechanism. However ...

> The main socket approach needs authentication support if multiple guests
> share a remote device emulation process. Otherwise guest A can access
> guest B's devices.
> 
> It's simpler if each device has a separate UNIX domain socket. It is not
> necessary to modify lsi53c895a in order to do this. Either the socket
> can be associated with the remote PCIe port (although I think the
> current code implements the older PCI Local Bus instead of PCIe) or a
> separate -object mpqlink,device=lsi1,fd=4 object can be defined (I think
> that's the syntax I've shared in the past).
> 
> For now though, just using the -machine remote,fd=4 approach is fine -
> but limited to 1 device.
> 
> Stefan

I agree to all of the above. Starting with a single fd is a good idea.

-- 
MST