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Re: [Xen-devel] Re: [Xen-users] Nested Virtualisation question

To: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-users] Nested Virtualisation question
From: Jeroen Groenewegen van der Weyden <groen692@xxxxxxxxx>
Date: Thu, 07 Apr 2011 07:36:27 +0200
Cc: "Christoph.Egger@xxxxxxx" <Christoph.Egger@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "eddie.dong@xxxxxxxxx" <eddie.dong@xxxxxxxxx>
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I couldn't help noticing some patches were added in the /staging/xen-unstable branch. So I gave it a go.

I know it is not called the unstable branch for nothing but, but I want to let you know that it the entire system crashes when any domain is created:
xl create someDomain -> results in immediate system crash

System:
- domO system openSUSE 11.4 x86_64. kernel 2.6.37.1-1.2-xen
- xen build from staging/xen-unstable (c/s 23172)
- proc intel q9450


+++++++++++++console output
hydra:/etc/xen/vm # xl create groscWindowsXpWorkstation
Parsing config file groscWindowsXpWorkstation
xc: info: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->00000000001795b0
  TOTAL:         0000000000000000->0000000017800000
  ENTRY ADDRESS: 0000000000100000
xc: info: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x00000000000000bb
  1GB PAGES: 0x0000000000000000
libxl: error: libxl_device.c:475:libxl__wait_for_device_model Device Model not ready xl: fatal error: libxl_create.c:532, rc=-1: libxl__confirm_device_model_startup

+++++++++++++

Op 4-4-2011 11:51, Tim Deegan schreef:
At 07:47 +0100 on 04 Apr (1301903251), Jeroen Groenewegen van der Weyden wrote:
Hello,

I have A question about nested virtualisation, the xen user list
suggested to post the question here.
I need nested virtualisation to run an application on out en
environment, which uses kvm it-self.

I suppose I have to apply these patches:
-
http://xen.markmail.org/search/?q=nested%20vmx#query:nested%20vmx+page:1+mid:z33lihxnbdjghua5+state:results
-  or http://xenbits.xen.org/ext/cegger/nestedhvm/

Is it correct these patches are now in the xen-unstable branch?
Not just yet.  There were two problems outstanding with patch #12 of the
latest version (a TLB flush race and a subsequent deadlock in the fix),
which are both fixed.  As soon as Christoph posts his fixes, the patch
series will be applied.

Cheers,

Tim.

Anything else to get me on my way.


My goal is

DOM0
   openSUSE 11.4 with xen 4.X

DOMU1
   SLES 11 SP1
    kvm guest HVM domu1a (propetary OS)
    kvm guest HVM domu1b (sles 10 sp3)
    kvm guest HVM domu1c (sles 10 sp3)
    kvm guest HVM domu1b (sles 10 sp3)

Op 3-4-2011 23:29, Todd Deshane schreef:
On Sun, Apr 3, 2011 at 8:32 PM, Jeroen Groenewegen van der Weyden
<groen692@xxxxxxxxx>   wrote:
I now am in the position to start testing your suggestion.

An additional question, is it correct the patches you mention here are part
of the xen4.2-unstable branch?
are these patches for vt-x or for svm only? the developer seems to be from
amd. My machines are running on intel.

The latest patch series is here:
http://xen.1045712.n5.nabble.com/PATCH-00-12-Nested-Virtualization-Overview-td3415672.html

Not sure if it has been accepted yet or not. You can email the
developer and/or devel list for confirmation.

Thanks,
Todd

mfg,
Jeroen

Op 15-2-2011 16:21, Todd Deshane schreef:
On Tue, Feb 15, 2011 at 6:47 AM, Jeroen Groenewegen van der Weyden
<groen692@xxxxxxxxx>     wrote:
The why is a good question,
We use xen as out main virtualisation platform. But now there are
applications that use virtualisation it self. In my case I have an
application that uses kvm. So to put it on our xen server it needs to be
nested. I guess in the future more of these situation will appear.

I read somethings about nested virtualisation and I wonder If somebody
has
any experience with it.

To run KVM inside of a guest you need virtualization support within
the guest (running nested xen doesn't require the double nested
(unless you want to do HVM within the nested of course))

Patches can be found here:

http://xen.markmail.org/search/?q=nested%20vmx#query:nested%20vmx+page:1+mid:z33lihxnbdjghua5+state:results

I believe KVM should also have support for nested vmx and nested svm.

The use cases are fairly slim, so finding users/testers is often
difficult.

Please report any bugs you find to the appropriate devel lists and cc
the appropriate nested virtualization maintainers .

Hope that helps.

Thanks,
Todd

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