Re: [Xen-devel] How PV frontend and backend initializes?

[tosher 1 <akm2tosher@xxxxxxxxx>]

Anthony and Roger, thanks for your informative responses. It helped a lot.


> I'm however unsure by what you mean with instance, so you might have
> to clarify exactly what you mean in order to get a more concise
> reply.

Let's say there are two DomU's, and their respective network interfaces are 
xenbr0 and xenbr1. Therefore, there supposed to be two PV netback drivers 
running in Dom0 (or driver domain): one for xenbr0 and another for xenbr1. By 
the term instance, I am refering to these drivers. If later there comes another 
interface xenbr3, there will be the third instance of the backend driver. I was 
wondering how these multiple instances are created and when.

Now, as you pointed to the xen toolstack, I explored xl/libxl a little bit. I 
realized for two separate devices, libxl creates two different paths both for 
the frontend and backend. The OSes keeps watching xenstore paths. If an OS 
finds a device of the type it is interested in, it creates the instance of the 
corresponding driver (frontend or backend) if the device is not initialized 
already. The path is the parameter which make one instance different from the 
others.

Please let me know if I understood it wrong. Thanks!


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