Re: [Xen-devel] suspend operation in XEND

[Nauzad Sadry <nauzad@xxxxxxxxx>]

So when does the event channel between the backend & front end drivers
break during suspend operation in XEND ??

Also when is the NETIF_INTERFACE_STATUS_DISCONNECTED status sent to
the front-end driver? I see code in the front-end driver that
processes this status type which results in the front-driver going to
a suspend state (like unregistering IRQs etc)

Nauzad


On Thu, 20 Jan 2005 22:54:25 +0000, Mark Williamson <maw48@xxxxxxxxxxxx> wrote:
> > During Save & Migration, XFRD sends "xfr.suspend" message to XEND.
> > This results in XEND suspending the domainU. A part of the suspension
> > should involve XEND sending DISCONNECT message to the front-end driver
> > in domainU
> 
> I don't think you'll find it.  Migrations / suspensions are treated like a
> backend driver restart - at resume the frontend driver is notified that it
> needs to reconnect to the backend and is responsible for requeuing any
> pending requests.
> 
> Instead of explicitly disconnecting the domain at suspend, the frontend driver
> just sorts everything out at resume.
> 
> Cheers,
> Mark
> 
> > I am trying to dig through the XEND python code & I am unable to find
> > this information. Can someone help ??
> >
> > Also can someone guide me through the set of functions that are called
> > by XEND as a part of suspend. What is the use of the the
> > domain_restart_schedule() ??
> >
> > Thanks
> >
> > Nauzad
> >
> >
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