sysconf() problem on Dom0

sysconf() problem on Dom0

[SUZUKI Kazuhiro]

Hi all,

I think patches/linux-2.6.16.13/xen-hotplug.patch does not work
correctly.

When I got a # of online CPUs by sysconf(_SC_NPROCESSORS_ONLN), this
function returns a # of all online and offline CPUs.

xen-hotplug.patch shows all CPUs including offline, but sysconf also
reads /proc/stat and counts online CPUs.

We should modify TOP command to use sysconf().

Thanks,
KAZ

Create VM with libxc

[ferrucci]

What is the exact sequence of call, with libxc e libxs, to create a 
linux VM and to attach a device to it? It's urgent, I can't find an 
example and the library is not enough documented. I must use it in a C 
program that creates VM's automatically.

Ferrucci Luca

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RE: Create VM with libxc

[Petersson, Mats]

> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com 
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of 
> ferrucci@cli.di.unipi.it
> Sent: 28 June 2006 18:17
> To: xen-devel@lists.xensource.com
> Subject: [Xen-devel] Create VM with libxc
> 
> What is the exact sequence of call, with libxc e libxs, to create a 
> linux VM and to attach a device to it? It's urgent, I can't find an 
> example and the library is not enough documented. I must use 
> it in a C 
> program that creates VM's automatically.

What's wrong with using something like 
execve("xm", args);

--
Mats

> 
> Ferrucci Luca
> 
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> 
> 
> 
> _______________________________________________
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> 
> 

RE: Create VM with libxc

[ferrucci]

> What's wrong with using something like
> execve("xm", args);
>
> --
> Mats
>
I know this solution but it's not enough for my purpose. I must use 
libxc/xs because I must know when I exactly create a VM and I want 
receive a callback.
Can someone help me?

Ferrucci Luca

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RE: Create VM with libxc

[Petersson, Mats]

> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com 
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of 
> ferrucci@cli.di.unipi.it
> Sent: 28 June 2006 18:37
> To: xen-devel@lists.xensource.com
> Subject: RE: [Xen-devel] Create VM with libxc
> 
> 
> > What's wrong with using something like
> > execve("xm", args);
> >
> > --
> > Mats
> >
> I know this solution but it's not enough for my purpose. I must use 
> libxc/xs because I must know when I exactly create a VM and I want 
> receive a callback.
> Can someone help me?

Sure, I just try to suggest the most user-friendly approach before I go
into more complicated solutions... 

So, you need to look at .../tools/python/xm/create.py - but beware that
creating a domain isn't entirely straight-forward... 

Or if you want a more direct method, you need to parse or know the
"builder" key, and use either xc_linux_build or xc_hvm_build to perform
the actual domain creation. Not sure how you attach devices, I haven't
worked with that... 

--
Mats
> 
> Ferrucci Luca
> 
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> 
> 
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> 
> 

RE: Create VM with libxc

[ferrucci]

>
> Sure, I just try to suggest the most user-friendly approach before I go
> into more complicated solutions...
>
> So, you need to look at .../tools/python/xm/create.py - but beware that
> creating a domain isn't entirely straight-forward...
>
> Or if you want a more direct method, you need to parse or know the
> "builder" key, and use either xc_linux_build or xc_hvm_build to perform
> the actual domain creation. Not sure how you attach devices, I haven't
> worked with that...
>
> --
> Mats
>>
>> Ferrucci Luca
>>
>> ----------------------------------------------------------------
>> This message was sent using IMP, the Internet Messaging Program.
>>
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>>
>>

I have used xc_linux_build and I've created a VM, encrease memory 
reservation. But, how can I create a console channel with it? How can I 
attach a device using libxs?

Thank you for your reply Mats.

Ferrucci Luca



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Re: Create VM with libxc

[Anthony Liguori]

ferrucci@cli.di.unipi.it wrote:
> What is the exact sequence of call, with libxc e libxs, to create a 
> linux VM and to attach a device to it? It's urgent, I can't find an 
> example and the library is not enough documented. I must use it in a C 
> program that creates VM's automatically.

Search the archives for some of the code that Jacob has posted.

These domains aren't going to play nicely with Xend though so I suspect 
strongly that it's not going to address your problem adequately.  It's 
hard to say when you're so cryptic about your needs ;-)

Regards,

Anthony Liguori

> Ferrucci Luca
>
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