How to get DomU id from DomU

How to get DomU id from DomU

[Roger Pau Monné]

Hello,

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?

Thanks, Roger.

Re: How to get DomU id from DomU

[Laszlo Ersek]

On 01/31/12 11:01, Roger Pau Monné 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.

Laszlo

Re: How to get DomU id from DomU

[Roger Pau Monné]

2012/1/31 Laszlo Ersek <lersek@redhat.com>:
> On 01/31/12 11:01, Roger Pau Monné 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.

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Re: How to get DomU id from DomU

[Vasiliy Tolstov]

2012/1/31 Roger Pau Monné <roger.pau@entel.upc.edu>:
> Hello,
>
> 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?
>

xenstore read domid



-- 
Vasiliy Tolstov,
Clodo.ru
e-mail: v.tolstov@selfip.ru
jabber: vase@selfip.ru

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Re: How to get DomU id from DomU

[Ian Campbell]

On Tue, 2012-01-31 at 10:35 +0000, Roger Pau Monné wrote:
> 2012/1/31 Laszlo Ersek <lersek@redhat.com>:
> > On 01/31/12 11:01, Roger Pau Monné 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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