Re: Block front and back connection

[Daniel Castro <evil.dani@gmail.com>]

On Tue, Aug 9, 2011 at 11:27 AM, Wei Liu <liuw@liuw.name> wrote:
> On Mon, Aug 08, 2011 at 11:17:52PM +0900, Daniel Castro wrote:
>> Hello,
>>
>> I am trying to make my frontend block driver connect to xen block
>> backend. I have the ring and gref, yet I do not know where in xenstore
>> should I write the keys to tell the backend to connect to my frontend.
>>
>
> You can find some clues in libxl_devices.c .
>
> The frontend path is
>
> /local/domain/FRONTEND_DOMID/device/DEVICE_KIND/DEVID
>
> The backend path is
>
> /local/domain/BACKEND_DOMID/backend/BACKEND_KIND/FRONTEND_DOMID/DEVID
>
> Often the BACKEND_DOMID is 0.
>
> And looking into Linux kernel's xen-{blkfront,blkback} helps you a
> lot.
>
> Then you can switch xenbus state after proper values are in place, so
> that frontend and backend can connect to each other.
>
> Wei.
>

Thank, this is what I was looking for!

Daniel



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