Re: How to create/use RPMSG-over-VIRTIO devices in Linux

[Jason Gunthorpe <jgg@ziepe.ca>]

On Fri, Sep 13, 2024 at 08:39:26AM -0600, Mathieu Poirier wrote:
> KVM has nothing to do with this.  The life of a virtio device starts
> in the VMM (Virtual Machine Manager) where a backend device is created
> and a virtio MMIO entry for that device is added to the device tree
> that is fed to the VM kernel.  When the VM kernel boots the virtio
> MMIO entry in the DT is parsed as part of the normal device discovery
> process and a virtio-device is instantiated, added to the virtio-bus
> and a driver is probed.
> 
> I suggest you start looking at that process using the kvmtool and a
> simple virtio device such as virtio-rng.

I would repeat again, I think trying to create a companion virtio
device to go along with a real vPCI device and then logically
associating both of them with a single driver is going to cause so
much pain you should not do it.

Find a way to send your RPCs through your own vPCI device.

Jason