Re: vbus design points: shm and shm-signals

[Anthony Liguori <anthony@codemonkey.ws>]

Anthony Liguori wrote:
> IOW, I can envision a model that looked like PCI -> virtio-pci -> 
> virtio-shm -> virtio-ring -> virtio-net

Let me stress that what's important here is that devices target either 
virtio-ring or virtio-shm.  If we had another transport, those drivers 
would be agnostic toward it.  We really want to preserve the ability to 
use all devices over a PCI transport.  That's a critical requirement for us.

The problem with vbus as it stands today, is that it presents vbus -> 
virtio-ring -> virtio-net and allows drivers to target either 
virtio-ring or vbus directly.  If a driver targets vbus directly, then 
the driver is no longer transport agnostic and we could not support that 
driver over PCI.

Regards,

Anthony Liguori