Dom0-DomU communication

Dom0-DomU communication

[Akshay Joglekar]

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Hi all,

I want to establish communication between dom0 and domU in order to send simple data such as a character string. What is the best way to go about this?

Any help is greatly appreciated. Thanks in advance.

Akshay



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Re: Dom0-DomU communication

[David]

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The Xenstore

On 17 February 2010 22:00, Akshay Joglekar <akshayj_18@yahoo.co.in> wrote:

> Hi all,
>
> I want to establish communication between dom0 and domU in order to send
> simple data such as a character string. What is the best way to go about
> this?
>
> Any help is greatly appreciated. Thanks in advance.
>
> Akshay
>
> ------------------------------
> Your Mail works best with the New Yahoo Optimized IE8. Get it NOW!<http://in.rd.yahoo.com/tagline_ie8_new/*http://downloads.yahoo.com/in/internetexplorer/>
> .
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
>

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Re: Dom0-DomU communication

[Akshay Joglekar]

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Hi David,

Thanks for the reply. Can the XenStore also be used for transferring large amounts of data like a file? If not what can be used for file transfers between dom0 and domU?

Akshay
 

--- On Thu, 18/2/10, David <admin@dmarkey.com> wrote:

From: David <admin@dmarkey.com>
Subject: Re: [Xen-devel] Dom0-DomU communication
To: "Akshay Joglekar" <akshayj_18@yahoo.co.in>
Cc: xen-devel@lists.xensource.com
Date: Thursday, 18 February, 2010, 3:51 AM

The Xenstore

On 17 February 2010 22:00, Akshay Joglekar <akshayj_18@yahoo.co.in> wrote:

Hi all,

I want to establish communication between dom0 and domU in order to send simple data such as a character string. What is the best way to go about this?


Any help is greatly appreciated. Thanks in advance.

Akshay


       
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Re: Dom0-DomU communication

[David]

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No not really, Go through a network for that.

It is really designed for small amounts of data, usually configuration
related.

In your original post you did say "in order to send simple data such as a
character string.",
for this use case I would use the xenstore, although its easy to read/write
to the xenstore in Linux guests, i'm not sure if the same utilities are
available in Windows.


On 18 February 2010 23:19, Akshay Joglekar <akshayj_18@yahoo.co.in> wrote:

> Hi David,
>
> Thanks for the reply. Can the XenStore also be used for transferring large
> amounts of data like a file? If not what can be used for file transfers
> between dom0 and domU?
>
> Akshay
>
>
> --- On *Thu, 18/2/10, David <admin@dmarkey.com>* wrote:
>
>
> From: David <admin@dmarkey.com>
> Subject: Re: [Xen-devel] Dom0-DomU communication
> To: "Akshay Joglekar" <akshayj_18@yahoo.co.in>
> Cc: xen-devel@lists.xensource.com
> Date: Thursday, 18 February, 2010, 3:51 AM
>
>
> The Xenstore
>
> On 17 February 2010 22:00, Akshay Joglekar <akshayj_18@yahoo.co.in<http://mc/compose?to=akshayj_18@yahoo.co.in>
> > wrote:
>
>> Hi all,
>>
>> I want to establish communication between dom0 and domU in order to send
>> simple data such as a character string. What is the best way to go about
>> this?
>>
>> Any help is greatly appreciated. Thanks in advance.
>>
>> Akshay
>>
>> ------------------------------
>> Your Mail works best with the New Yahoo Optimized IE8. Get it NOW!<http://in.rd.yahoo.com/tagline_ie8_new/*http://downloads.yahoo.com/in/internetexplorer/>
>> .
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com<http://mc/compose?to=Xen-devel@lists.xensource.com>
>> http://lists.xensource.com/xen-devel
>>
>>
>
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>
>
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> Xen-devel mailing list
> Xen-devel@lists.xensource.com<http://mc/compose?to=Xen-devel@lists.xensource.com>
> http://lists.xensource.com/xen-devel
>
>
> ------------------------------
> The INTERNET now has a personality. YOURS! See your Yahoo! Homepage<http://in.rd.yahoo.com/tagline_yyi_1/*http://in.yahoo.com/>
> .
>

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RE: Dom0-DomU communication

[Dan Magenheimer]

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As an example of small files being passed through Xenstore, look in the xen source tree under tools/xenballoon/xenballoond in the function send_memory_stats(),

which passes the contents of /proc/meminfo and /proc/vmstat via xenstore from a domU to dom0.  Note that the domU must have xenstore tools installed on it (which is often not installed by default).

 

Also note that this has likely never been tested with larger files or under heavy system loads, so probably shouldn't be relied on in a real production environment.  That's what networks (and iSCSI and SANs and NFS) are designed for.

 

From: David [mailto:admin@dmarkey.com] 
Sent: Friday, February 19, 2010 1:36 AM
To: Akshay Joglekar
Cc: xen-devel@lists.xensource.com
Subject: Re: [Xen-devel] Dom0-DomU communication

 

No not really, Go through a network for that.

 

It is really designed for small amounts of data, usually configuration related.

 

In your original post you did say "in order to send simple data such as a character string.",

for this use case I would use the xenstore, although its easy to read/write to the xenstore in Linux guests, i'm not sure if the same utilities are available in Windows.

 

On 18 February 2010 23:19, Akshay Joglekar <HYPERLINK "mailto:akshayj_18@yahoo.co.in"akshayj_18@yahoo.co.in> wrote:

Hi David,

Thanks for the reply. Can the XenStore also be used for transferring large amounts of data like a file? If not what can be used for file transfers between dom0 and domU?

Akshay
 

--- On Thu, 18/2/10, David <HYPERLINK "mailto:admin@dmarkey.com" \nadmin@dmarkey.com> wrote:


From: David <HYPERLINK "mailto:admin@dmarkey.com" \nadmin@dmarkey.com>
Subject: Re: [Xen-devel] Dom0-DomU communication
To: "Akshay Joglekar" <HYPERLINK "mailto:akshayj_18@yahoo.co.in" \nakshayj_18@yahoo.co.in>
Cc: HYPERLINK "mailto:xen-devel@lists.xensource.com" \nxen-devel@lists.xensource.com
Date: Thursday, 18 February, 2010, 3:51 AM

 

The Xenstore

On 17 February 2010 22:00, Akshay Joglekar <HYPERLINK "http://mc/compose?to=akshayj_18@yahoo.co.in" \nakshayj_18@yahoo.co.in> wrote:

Hi all,

I want to establish communication between dom0 and domU in order to send simple data such as a character string. What is the best way to go about this?

Any help is greatly appreciated. Thanks in advance.

Akshay

 

  _____  

Your Mail works best with the New Yahoo Optimized IE8. HYPERLINK "http://in.rd.yahoo.com/tagline_ie8_new/*http:/downloads.yahoo.com/in/internetexplorer/" \nGet it NOW!.


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RE: Dom0-DomU communication

[Akshay Joglekar]

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So, from all your inputs I understand that the XenStore is the best way for transferring small amounts of data, while network (through something like sockets) is good for file transfers. 

I was also wondering if there are is any convenient way of using shared memory (apart from XenStore) for file transfers. Like mapping memory pages from 1 domain to another?

Thanks

Akshay 

--- On Fri, 19/2/10, Dan Magenheimer <dan.magenheimer@oracle.com> wrote:

From: Dan Magenheimer <dan.magenheimer@oracle.com>
Subject: RE: [Xen-devel] Dom0-DomU communication
To: admin@dmarkey.com, "Akshay Joglekar" <akshayj_18@yahoo.co.in>
Cc: xen-devel@lists.xensource.com
Date: Friday, 19 February, 2010, 9:33 PM




 
 







As an example of small files being passed through Xenstore, look
in the xen source tree under tools/xenballoon/xenballoond in the function send_memory_stats(), 

which passes the contents of /proc/meminfo and /proc/vmstat via
xenstore from a domU to dom0.  Note that the domU must have xenstore tools
installed on it (which is often not installed by default). 

   

Also note that this has likely never been tested with larger
files or under heavy system loads, so probably shouldn’t be relied on in
a real production environment.  That’s what networks (and iSCSI and SANs
and NFS) are designed for. 

   







From: David
[mailto:admin@dmarkey.com] 

Sent: Friday, February 19, 2010 1:36 AM

To: Akshay Joglekar

Cc: xen-devel@lists.xensource.com

Subject: Re: [Xen-devel] Dom0-DomU communication 





   

No not really, Go through a network for that. 



   





It is really designed for small amounts of data, usually
configuration related. 





   





In your original post you did say "in order to send
simple data such as a character string.", 





for this use case I would use the xenstore, although its
easy to read/write to the xenstore in Linux guests, i'm not sure if the same
utilities are available in Windows. 





   



On 18 February 2010 23:19, Akshay Joglekar <akshayj_18@yahoo.co.in> wrote: 


 
  
  Hi David,

  

  Thanks for the reply. Can the XenStore also be used for transferring large
  amounts of data like a file? If not what can be used for file transfers
  between dom0 and domU?

  

  Akshay

   

  

  --- On Thu, 18/2/10, David <admin@dmarkey.com> wrote: 
  

  From: David <admin@dmarkey.com>

  Subject: Re: [Xen-devel] Dom0-DomU communication

  To: "Akshay Joglekar" <akshayj_18@yahoo.co.in>

  Cc: xen-devel@lists.xensource.com

  Date: Thursday, 18 February, 2010, 3:51 AM 
  
  
     
  
  The Xenstore 
  
  On 17 February 2010 22:00, Akshay Joglekar <akshayj_18@yahoo.co.in>
  wrote: 
  
   
    
    
    Hi all,

    

    I want to establish communication between dom0 and domU in order to send
    simple data such as a character string. What is the best way to go about
    this?

    

    Any help is greatly appreciated. Thanks in advance.

    

    Akshay 
    
    
   
  
  
     
  
  
  
  Your Mail works best with the New Yahoo Optimized IE8. Get it NOW!. 
  
  

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  http://lists.xensource.com/xen-devel 
  
     
  
     
  
  
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RE: Dom0-DomU communication

[Dan Magenheimer]

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Mapping memory pages betwen dom0 and domU can be done with a grant table, which is used heavily for paravirtualized device drivers.  (I’m fairly ignorant of the details, so maybe someone else will answer if you find that is a good direction to look.)  Doing something like Unix shared memory between domU and domU has been explored by various research projects (XenSocket and google for “xen inter domain memory sharing” for others) but I don’t think anything (other than grant tables) has ever made it upstream into Xen.

 

From: Akshay Joglekar [mailto:akshayj_18@yahoo.co.in] 
Sent: Friday, February 19, 2010 12:53 PM
To: Dan Magenheimer; admin@dmarkey.com
Cc: xen-devel@lists.xensource.com
Subject: RE: [Xen-devel] Dom0-DomU communication

 

So, from all your inputs I understand that the XenStore is the best way for transferring small amounts of data, while network (through something like sockets) is good for file transfers. 

I was also wondering if there are is any convenient way of using shared memory (apart from XenStore) for file transfers. Like mapping memory pages from 1 domain to another?

Thanks

Akshay 

--- On Fri, 19/2/10, Dan Magenheimer <dan.magenheimer@oracle.com> wrote:


From: Dan Magenheimer <dan.magenheimer@oracle.com>
Subject: RE: [Xen-devel] Dom0-DomU communication
To: admin@dmarkey.com, "Akshay Joglekar" <akshayj_18@yahoo.co.in>
Cc: xen-devel@lists.xensource.com
Date: Friday, 19 February, 2010, 9:33 PM

As an example of small files being passed through Xenstore, look in the xen source tree under tools/xenballoon/xenballoond in the function send_memory_stats(),

which passes the contents of /proc/meminfo and /proc/vmstat via xenstore from a domU to dom0.  Note that the domU must have xenstore tools installed on it (which is often not installed by default).

 

Also note that this has likely never been tested with larger files or under heavy system loads, so probably shouldn’t be relied on in a real production environment.  That’s what networks (and iSCSI and SANs and NFS) are designed for.

 

From: David [mailto:admin@dmarkey.com] 
Sent: Friday, February 19, 2010 1:36 AM
To: Akshay Joglekar
Cc: xen-devel@lists.xensource.com
Subject: Re: [Xen-devel] Dom0-DomU communication

 

No not really, Go through a network for that.

 

It is really designed for small amounts of data, usually configuration related.

 

In your original post you did say "in order to send simple data such as a character string.",

for this use case I would use the xenstore, although its easy to read/write to the xenstore in Linux guests, i'm not sure if the same utilities are available in Windows.

 

On 18 February 2010 23:19, Akshay Joglekar <akshayj_18@yahoo.co.in> wrote:

Hi David,

Thanks for the reply. Can the XenStore also be used for transferring large amounts of data like a file? If not what can be used for file transfers between dom0 and domU?

Akshay
 

--- On Thu, 18/2/10, David <admin@dmarkey.com> wrote:


From: David <admin@dmarkey.com>
Subject: Re: [Xen-devel] Dom0-DomU communication
To: "Akshay Joglekar" <akshayj_18@yahoo.co.in>
Cc: xen-devel@lists.xensource.com
Date: Thursday, 18 February, 2010, 3:51 AM

 

The Xenstore

On 17 February 2010 22:00, Akshay Joglekar <HYPERLINK "http://mc/compose?to=akshayj_18@yahoo.co.in" \nakshayj_18@yahoo.co.in> wrote:

Hi all,

I want to establish communication between dom0 and domU in order to send simple data such as a character string. What is the best way to go about this?

Any help is greatly appreciated. Thanks in advance.

Akshay

 

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RE: Dom0-DomU communication

[Daniel Stodden]

On Fri, 2010-02-19 at 14:53 -0500, Akshay Joglekar wrote:
> So, from all your inputs I understand that the XenStore is the best
> way for transferring small amounts of data, while network (through
> something like sockets) is good for file transfers. 
> 
> I was also wondering if there are is any convenient way of using
> shared memory (apart from XenStore) for file transfers. Like mapping
> memory pages from 1 domain to another?

Use of memory sharing between guests typically takes a dedicated driver
and device class in both domU and dom0. Sure you can write one. Not so
sure if you should :)

There's also XenFS, but I never tried it out.
Maybe that's another option you might want to look into.

Daniel