Re: simple backend, frontend

[Deepak Manohar <mjdeepak@gmail.com>]

Hi,

 Ive looked at the blkifdrivers.txt. 

 Wht Im confused about is - both in the netif backend and the blkif
backend the initial communication is with xend. The blkif initially
sends - BLKIF_DRIVER_STATUS_UP
the netif backend sends an equivalent. Im assuming that Xend
differentiates between the two and sends different response either
CMSG_BLKIF_BE_CREATE or CMSG_NETIF_BE_CREATE.

 Now if I need to add another custom backend using the same method as
the netif or blkif backends dont I have to modify Xend as well?
 
Is there a simpler way of establishing event channels between domains
by directly accessing the API in xen/common/event_channel.c

 Some assumptions that Im making - the frontend will be started only
after the backend is running. Im primarily going to be using this
frontend/backend for transferring large data between a user domain and
the control domain.  So I will have to establish shared mem pages as
well.

Thanks.

Deepak


On Thu, 11 Nov 2004 16:18:09 +0000, Andrew Warfield
<andrew.warfield@gmail.com> wrote:
> You may also want to look at docs/misc/blkif-drivers-explained.txt,
> which has a textual description of how the split block drivers work.
> Alex went through it about a week ago and brought it up to date with
> the (then) current sources.
> 
> a.
> 
> 
> 
> 
> On Thu, 11 Nov 2004 16:07:09 +0000, Mark A. Williamson
> <mark.williamson@cl.cam.ac.uk> wrote:
> > In the event you can't find a simple example, feel free to ask questions about
> > the existing block / net drivers.  You'll find that the frontends are much
> > simpler so you may want to look at those first.  I also found that the
> > backend for network was easier to understand than the block backend.
> >
> > You should also look at domain_controller.h, which defines all of the control
> > messages used to set up the shared memory and event channels.
> >
> > HTH,
> > Mark
> >
> >
> >
> > On Thursday 11 Nov 2004 15:37, Deepak Manohar wrote:
> > > Hi all,
> > >
> > > Does anyone have a custom backend, frontend pair?  Preferably a very
> > > simple one that simply sets up eventchannels and shared memory pages.
> > >
> > > Thanks.
> > >
> > > Deepak
> > >
> > >
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