Xen devel - Feb 2011 - Q on shared_mem and event_channel

Hello,

I think this might have been discussed numerous times on this mailing-list,
if there is a relevant post I can refer to please point that to me. What I
am trying to do is set up a shared memory/event-channels between dom0 and
domU''s via socket calls because I cannot use existing
front-end/back-end
driver mechanism since it relies on devices aka vif, vbd type of device to
be created and uses xenbus/xenstored for communication between domains.
Adding support for new device similar to vif/vbd may require xapi changes as
well which I would like to avoid. Instead write own socket library calls aka
bind/connect and use them to setup shared memory and event channels between
domains. I haven''t sketched out details yet, but thought of checking if
this
would be feasible.

Thanks
-Ravi


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Forgot to mention an additional option. In addition to sockets, I was
thinking to use block-devices i.e create /dev/<block-device> in both dom0
and domU''s and use these to communicate between domains...

Your inputs will be highly appreciated.

-Ravi


On Tue, Feb 8, 2011 at 1:34 PM, ravi kerur <rkerur@gmail.com> wrote:
> Hello,
>
> I think this might have been discussed numerous times on this mailing-list,
> if there is a relevant post I can refer to please point that to me. What I
> am trying to do is set up a shared memory/event-channels between dom0 and
> domU''s via socket calls because I cannot use existing
front-end/back-end
> driver mechanism since it relies on devices aka vif, vbd type of device to
> be created and uses xenbus/xenstored for communication between domains.
> Adding support for new device similar to vif/vbd may require xapi changes
as
> well which I would like to avoid. Instead write own socket library calls
aka
> bind/connect and use them to setup shared memory and event channels between
> domains. I haven''t sketched out details yet, but thought of
checking if this
> would be feasible.
>
> Thanks
> -Ravi
>

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On Tue, Feb 08, 2011 at 01:34:48PM -0800, ravi kerur
wrote:
> Hello,
> 
> I think this might have been discussed numerous times on this mailing-list,
> if there is a relevant post I can refer to please point that to me. What I
> am trying to do is set up a shared memory/event-channels between dom0 and
> domU''s via socket calls because I cannot use existing
front-end/back-end
> driver mechanism since it relies on devices aka vif, vbd type of device to
> be created and uses xenbus/xenstored for communication between domains.
> Adding support for new device similar to vif/vbd may require xapi changes
as
> well which I would like to avoid. Instead write own socket library calls
aka
> bind/connect and use them to setup shared memory and event channels between
> domains. I haven''t sketched out details yet, but thought of
checking if this
> would be feasible.
Like this:
http://www.gossamer-threads.com/lists/xen/devel/197987
?

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Thanks Konrad, couple of q''s

1. will this work with xenserver 5.6.0(citrix)? reason being, it uses
/dev/xen/gntalloc and /dev/xen/gtndev  and I don''t see these devices in
xenserver 5.6.0 dom0 and I don''t see similar devices in xenserver 5.6.0

2. I might be able to use this functionality in conjunction with socket
calls, do you see any reason not to do it? Basically in my case I want to
have shared_mem/evt_chn setup either during bootup of dom0/domU''s or
when my
application is started.

Thanks
-Ravi

On Tue, Feb 8, 2011 at 1:57 PM, Konrad Rzeszutek Wilk <
konrad.wilk@oracle.com> wrote:
> On Tue, Feb 08, 2011 at 01:34:48PM -0800, ravi kerur wrote:
> > Hello,
> >
> > I think this might have been discussed numerous times on this
> mailing-list,
> > if there is a relevant post I can refer to please point that to me.
What
> I
> > am trying to do is set up a shared memory/event-channels between dom0
and
> > domU''s via socket calls because I cannot use existing
front-end/back-end
> > driver mechanism since it relies on devices aka vif, vbd type of
device
> to
> > be created and uses xenbus/xenstored for communication between
domains.
> > Adding support for new device similar to vif/vbd may require xapi
changes
> as
> > well which I would like to avoid. Instead write own socket library
calls
> aka
> > bind/connect and use them to setup shared memory and event channels
> between
> > domains. I haven''t sketched out details yet, but thought of
checking if
> this
> > would be feasible.
>
> Like this:
> http://www.gossamer-threads.com/lists/xen/devel/197987
> ?
>

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On Tue, Feb 08, 2011 at 03:05:31PM -0800, ravi kerur
wrote:
> Thanks Konrad, couple of q''s
> 
> 1. will this work with xenserver 5.6.0(citrix)? reason being, it uses
> /dev/xen/gntalloc and /dev/xen/gtndev  and I don''t see these
devices in
> xenserver 5.6.0 dom0 and I don''t see similar devices in xenserver
5.6.0
You will have to back-port them to it.
> 
> 2. I might be able to use this functionality in conjunction with socket
> calls, do you see any reason not to do it? Basically in my case I want to
> have shared_mem/evt_chn setup either during bootup of dom0/domU''s
or when my
> application is started.
Well, that requires much more than the patches I mentioned. I think Citrix
might have some off-the-shelf code that does it. Ask on the Xapi mailing list.



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Hi Konrad,

xapi mailing list response time is pretty slow(I had experienced it before),
haven''t heard from xapi mailing list for my Q yet. If i go to Citrix
support
it takes at least a week to get a response.

I am not quite sure whom to followup with. Any inputs appreciated.

Thanks
-Ravi

On Tue, Feb 8, 2011 at 4:07 PM, ravi kerur <rkerur@gmail.com> wrote:
> Thanks Konrad, is xapi mailing list xen-api@lists.xensource.com ?
>
>
> On Tue, Feb 8, 2011 at 3:12 PM, Konrad Rzeszutek Wilk <
> konrad.wilk@oracle.com> wrote:
>
>> On Tue, Feb 08, 2011 at 03:05:31PM -0800, ravi kerur wrote:
>> > Thanks Konrad, couple of q''s
>> >
>> > 1. will this work with xenserver 5.6.0(citrix)? reason being, it
uses
>> > /dev/xen/gntalloc and /dev/xen/gtndev  and I don''t see
these devices in
>> > xenserver 5.6.0 dom0 and I don''t see similar devices in
xenserver 5.6.0
>>
>> You will have to back-port them to it.
>> >
>> > 2. I might be able to use this functionality in conjunction with
socket
>> > calls, do you see any reason not to do it? Basically in my case I
want
>> to
>> > have shared_mem/evt_chn setup either during bootup of
dom0/domU''s or
>> when my
>> > application is started.
>>
>> Well, that requires much more than the patches I mentioned. I think
Citrix
>> might have some off-the-shelf code that does it. Ask on the Xapi
mailing
>> list.
>>
>>
>>
>

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