DomU to Dom0 Communication in Xen HVM?

DomU to Dom0 Communication in Xen HVM?

[Larry White]

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I am new to Xen and want to provide simple communication between my DomU and
Dom0 environments.  I just need to be able to pass a few bytes of
information back and forth between DomU and Dom0 while using some form of
event management to know when an update occurs so I can act on it.  At
first, it appeared that using XenBus and XenStore might be the right
solution for this.  However, after looking over the documentation, it seems
that XenBus and XenStore should only be used in a PVM Xen configuration, not
a HVM model like mine.  Is this true?  

 

What would be the best way to accomplish this?  Is there any sample code
which demonstrates this for a HVM Xen environment?

 

Any information regarding this would be greatly apprecated.

 

Larry

 


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Re: DomU to Dom0 Communication in Xen HVM?

[Konrad Rzeszutek Wilk]

On Tue, Jul 17, 2012 at 11:22:28PM -0500, Larry White wrote:
> I am new to Xen and want to provide simple communication between my DomU and
> Dom0 environments.  I just need to be able to pass a few bytes of
> information back and forth between DomU and Dom0 while using some form of
> event management to know when an update occurs so I can act on it.  At
> first, it appeared that using XenBus and XenStore might be the right
> solution for this.  However, after looking over the documentation, it seems
> that XenBus and XenStore should only be used in a PVM Xen configuration, not
> a HVM model like mine.  Is this true?  

It can be done in HVM.
> 
>  
> 
> What would be the best way to accomplish this?  Is there any sample code
> which demonstrates this for a HVM Xen environment?

libvchan is your best bet.
> 
>  
> 
> Any information regarding this would be greatly apprecated.
> 
>  
> 
> Larry
> 
>  
> 

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: DomU to Dom0 Communication in Xen HVM?

[Larry White]

Hi Konrad,

>On Tue, Jul 17, 2012 at 11:22:28PM -0500, LarryWhite wrote:
>I am new to Xen and want to provide simple communication between my DomU
>and
>Dom0 environments.  I just need to be able to pass a few bytes of
>information back and forth between DomU and Dom0 while using some form of
>event management to know when an update occurs so I can act on it.  At
>first, it appeared that using XenBus and XenStore might be the right
>solution for this.  However, after looking over the documentation, it seems
>that XenBus and XenStore should only be used in a PVM Xen configuration,
>not
>a HVM model like mine.  Is this true?  

>>It can be done in HVM.

>What would be the best way to accomplish this?  Is there any sample code
>which demonstrates this for a HVM Xen environment?

>>libvchan is your best bet.

Have been looking at libvchan as you suggested.  An additional bit of
information that I left out on my original post was that I would like to do
this in a "one to many" environment.  In other words, I want to support data
transfer from dom0 to a number of different domU's.  Would an approach such
as libvchan allow for this or would I need a separate process in dom0 for
each of the different domU channels?  I was really hoping to have a single
process running in dom0 to manage this. 

Thanks,
Larry