Xen devel - Sep 2010 - Where can I get a balloon driver to test PoD

I want to try PoD to test some code. After setting different value to maxmem and
memory config option, I can see PoD cache count in the domain dump debug output.
However, I can''t find a balloon driver to do more testing. I
don''t want to use 2.6.18 kernel because it is really a bit of legacy
now. In pvops dom0''s stable-2.6.32-x branch, I noticed
driver/xen/balloon.c only support PV xen domain as followed code stated. Simply
remove the check cause guest panic.

Does anyone know where I can get a working balloon driver for PV-on-HVM guest?
Does any branch in pvops dom0 support this? And, George, can you share me some
experience that how did you test your PoD patch?

Thanks
--jyh

static int __init balloon_init(void)
{
    unsigned long pfn;
    struct page *page;

    if (!xen_pv_domain())
        return -ENODEV;


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

>>> On 13.09.10 at 15:29, "Jiang, Yunhong"
<yunhong.jiang@intel.com> wrote:
> Does anyone know where I can get a working balloon driver for PV-on-HVM
guest?
You could build unmodified_drivers/ against our SLE11 SP1 kernel (or
XCP''s, which is based on this) or against OpenSuSE 11.3''s.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Jan, thanks for your information. I will try to get a SLE11 SP1 kernel or XCP
kernel.

Also not sure if Stefano has interests to fix this, since he added the
platform-pci driver, which makes pv-on-hvm possible. CC him.

Thanks
--jyh
>-----Original Message-----
>From: Jan Beulich [mailto:JBeulich@novell.com]
>Sent: Monday, September 13, 2010 9:43 PM
>To: Jiang, Yunhong
>Cc: George Dunlap; xen-devel
>Subject: Re: [Xen-devel] Where can I get a balloon driver to test PoD
>
>>>> On 13.09.10 at 15:29, "Jiang, Yunhong"
<yunhong.jiang@intel.com> wrote:
>> Does anyone know where I can get a working balloon driver for PV-on-HVM
guest?
>
>You could build unmodified_drivers/ against our SLE11 SP1 kernel (or
>XCP''s, which is based on this) or against OpenSuSE 11.3''s.
>
>Jan

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

On Mon, Sep 13, 2010 at 09:55:46PM +0800, Jiang, Yunhong
wrote:
> Jan, thanks for your information. I will try to get a SLE11 SP1 kernel or
XCP kernel.
> 
http://wiki.xensource.com/xenwiki/XenDom0Kernels

Links there.

-- Pasi
> Also not sure if Stefano has interests to fix this, since he added the
platform-pci driver, which makes pv-on-hvm possible. CC him.
> 
> Thanks
> --jyh
> 
> >-----Original Message-----
> >From: Jan Beulich [mailto:JBeulich@novell.com]
> >Sent: Monday, September 13, 2010 9:43 PM
> >To: Jiang, Yunhong
> >Cc: George Dunlap; xen-devel
> >Subject: Re: [Xen-devel] Where can I get a balloon driver to test PoD
> >
> >>>> On 13.09.10 at 15:29, "Jiang, Yunhong"
<yunhong.jiang@intel.com> wrote:
> >> Does anyone know where I can get a working balloon driver for
PV-on-HVM guest?
> >
> >You could build unmodified_drivers/ against our SLE11 SP1 kernel (or
> >XCP''s, which is based on this) or against OpenSuSE
11.3''s.
> >
> >Jan
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Yunhong:

When I originally developed the balloon drivers about a year ago, it
was possible to compile PV drivers externally, from
xen.hg/unmodified_drivers/linux-2.6 using Debian''s stock kernel.
However, since that time, things have changed and I haven''t been able
to.

The system I''m using now actually uses one of Stefano
Stabellini''s
"pv-on-hvm" trees.  It''s a bit experimental, but stable
enough, and
the balloon driver seems to be working.  He''s on holiday now, but you
can cc him and ask.

Another option would be to use a Windows guest, with either the XCP or
the OSS Windows drivers.  (Not sure of the OSS Windows drivers have
ballooning, but the XCP ones do.)

I have a stack of patches from XenServer to push upstream to
-unstable, but I haven''t had time to test them yet, due to
higher-priority things coming in.  Let me know how it goes.

 -George

On Mon, Sep 13, 2010 at 4:02 PM, Pasi Kärkkäinen <pasik@iki.fi>
wrote:
> On Mon, Sep 13, 2010 at 09:55:46PM +0800, Jiang, Yunhong wrote:
>> Jan, thanks for your information. I will try to get a SLE11 SP1 kernel
or XCP kernel.
>>
>
> http://wiki.xensource.com/xenwiki/XenDom0Kernels
>
> Links there.
>
> -- Pasi
>
>> Also not sure if Stefano has interests to fix this, since he added the
platform-pci driver, which makes pv-on-hvm possible. CC him.
>>
>> Thanks
>> --jyh
>>
>> >-----Original Message-----
>> >From: Jan Beulich [mailto:JBeulich@novell.com]
>> >Sent: Monday, September 13, 2010 9:43 PM
>> >To: Jiang, Yunhong
>> >Cc: George Dunlap; xen-devel
>> >Subject: Re: [Xen-devel] Where can I get a balloon driver to test
PoD
>> >
>> >>>> On 13.09.10 at 15:29, "Jiang, Yunhong"
<yunhong.jiang@intel.com> wrote:
>> >> Does anyone know where I can get a working balloon driver for
PV-on-HVM guest?
>> >
>> >You could build unmodified_drivers/ against our SLE11 SP1 kernel
(or
>> >XCP''s, which is based on this) or against OpenSuSE
11.3''s.
>> >
>> >Jan
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

This is a helpful wiki. Thanks for your information.

--jyh
>-----Original Message-----
>From: Pasi Kärkkäinen [mailto:pasik@iki.fi]
>Sent: Monday, September 13, 2010 11:02 PM
>To: Jiang, Yunhong
>Cc: Jan Beulich; George Dunlap; xen-devel; Stefano Stabellini
>Subject: Re: [Xen-devel] Where can I get a balloon driver to test PoD
>
>On Mon, Sep 13, 2010 at 09:55:46PM +0800, Jiang, Yunhong wrote:
>> Jan, thanks for your information. I will try to get a SLE11 SP1 kernel
or XCP kernel.
>>
>
>http://wiki.xensource.com/xenwiki/XenDom0Kernels
>
>Links there.
>
>-- Pasi
>
>> Also not sure if Stefano has interests to fix this, since he added the
platform-pci
>driver, which makes pv-on-hvm possible. CC him.
>>
>> Thanks
>> --jyh
>>
>> >-----Original Message-----
>> >From: Jan Beulich [mailto:JBeulich@novell.com]
>> >Sent: Monday, September 13, 2010 9:43 PM
>> >To: Jiang, Yunhong
>> >Cc: George Dunlap; xen-devel
>> >Subject: Re: [Xen-devel] Where can I get a balloon driver to test
PoD
>> >
>> >>>> On 13.09.10 at 15:29, "Jiang, Yunhong"
<yunhong.jiang@intel.com> wrote:
>> >> Does anyone know where I can get a working balloon driver for
PV-on-HVM
>guest?
>> >
>> >You could build unmodified_drivers/ against our SLE11 SP1 kernel
(or
>> >XCP''s, which is based on this) or against OpenSuSE
11.3''s.
>> >
>> >Jan
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

On Mon, 13 Sep 2010, George Dunlap wrote:
> Yunhong:
> 
> When I originally developed the balloon drivers about a year ago, it
> was possible to compile PV drivers externally, from
> xen.hg/unmodified_drivers/linux-2.6 using Debian''s stock kernel.
> However, since that time, things have changed and I haven''t been
able
> to.
> 
> The system I''m using now actually uses one of Stefano
Stabellini''s
> "pv-on-hvm" trees.  It''s a bit experimental, but stable
enough, and
> the balloon driver seems to be working.  He''s on holiday now, but
you
> can cc him and ask.

you might want to checkout:

git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.35-rc5-pvhvm-v7

this is upstream Linux pv on hvm plus few patches and one of them
enables ballooning.


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Yunhong: FYI, as of yesterday booting PoD with this kernel doesn''t
work correctly, due to some math error.  The balloon driver will
balloon down, but is about 8 megs off.  So eventually the guest OS
will try to populate those pages, and the guest will crash.  I suspect
it probably has to do with libxl not accounting for the video ram
properly, but I haven''t had a chance to look into it.

 -George

On Tue, Sep 21, 2010 at 5:53 PM, Stefano Stabellini
<stefano.stabellini@eu.citrix.com> wrote:
> On Mon, 13 Sep 2010, George Dunlap wrote:
>> Yunhong:
>>
>> When I originally developed the balloon drivers about a year ago, it
>> was possible to compile PV drivers externally, from
>> xen.hg/unmodified_drivers/linux-2.6 using Debian''s stock
kernel.
>> However, since that time, things have changed and I haven''t
been able
>> to.
>>
>> The system I''m using now actually uses one of Stefano
Stabellini''s
>> "pv-on-hvm" trees.  It''s a bit experimental, but
stable enough, and
>> the balloon driver seems to be working.  He''s on holiday now,
but you
>> can cc him and ask.
>
>
> you might want to checkout:
>
> git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git
2.6.35-rc5-pvhvm-v7
>
> this is upstream Linux pv on hvm plus few patches and one of them
> enables ballooning.
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

On Wed, 22 Sep 2010, George Dunlap wrote:
> Yunhong: FYI, as of yesterday booting PoD with this kernel doesn''t
> work correctly, due to some math error.  The balloon driver will
> balloon down, but is about 8 megs off.  So eventually the guest OS
> will try to populate those pages, and the guest will crash.  I suspect
> it probably has to do with libxl not accounting for the video ram
> properly, but I haven''t had a chance to look into it.
> 
I made few videoram adjustments in my xl ballooning series, probably
this issue will go away when the series is applied.

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Geroge/Stefano, thanks for your information very much. I will try this tree
after clone it locally.

Thanks
--jyh
>-----Original Message-----
>From: xen-devel-bounces@lists.xensource.com
>[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Stefano
Stabellini
>Sent: Wednesday, September 22, 2010 6:51 PM
>To: George Dunlap
>Cc: Jiang, Yunhong; xen-devel; Jan Beulich; Stefano Stabellini
>Subject: Re: [Xen-devel] Where can I get a balloon driver to test PoD
>
>On Wed, 22 Sep 2010, George Dunlap wrote:
>> Yunhong: FYI, as of yesterday booting PoD with this kernel
doesn''t
>> work correctly, due to some math error.  The balloon driver will
>> balloon down, but is about 8 megs off.  So eventually the guest OS
>> will try to populate those pages, and the guest will crash.  I suspect
>> it probably has to do with libxl not accounting for the video ram
>> properly, but I haven''t had a chance to look into it.
>>
>
>I made few videoram adjustments in my xl ballooning series, probably
>this issue will go away when the series is applied.
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.xensource.com
>http://lists.xensource.com/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel