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

[Jeroen Groenewegen van der Weyden <groen692@xxxxxxxxx>]

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