Re: [Xen-devel] How to get DomU id from DomU

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-01-31 at 10:35 +0000, Roger Pau Monnà wrote:
> 2012/1/31 Laszlo Ersek <lersek@xxxxxxxxxx>:
> > On 01/31/12 11:01, Roger Pau Monnà wrote:
> >
> >> This is quite a trivial question, but I haven't been able to find how
> >> to do it. Is there anyway to get the id of a PV DomU from inside the
> >> (same) PV DomU?
> >
> >
> > Here's a hack (untested): one could create a loop event channel with
> > EVTCHNOP_bind_interdomain (passing in DOMID_SELF as remote_dom), then query
> > it with EVTCHNOP_status (also passing in DOMID_SELF). On return,
> > "interdomain.dom" (= the remote end) should have the real domid.
> 
> Thanks, sure that looks quite hackish, there's no other way to do it?
> I need to know the dom id to set the correct watches on xenstore for
> driver domains. Each driver domain should watch a specific path in
> xenstore, that is determined based on the id of the domain itself.

Would it make sense to put that path under the domain's "home
directory"?

Ian.



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