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xen-devel
Re: [Xen-devel] Re: [Xen-users] Nested Virtualisation question
On 07/04/2011 08:09, "Keir Fraser" <keir.xen@xxxxxxxxx> wrote:
> On 07/04/2011 06:36, "Jeroen Groenewegen van der Weyden"
> <groen692@xxxxxxxxx> wrote:
>
>> 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
>
> Probably the same as this, happening often in the automated tests:
Likely reason: nestedhvm_vcpu_initialise() being called unconditionally in
hvm_vcpu_initialise() even though nestedhvm has not been configured for this
domain. This then fails because there is no nestedhvm handler for Intel yet.
And beyond that it's most likely an issue of a broken failure path, or a
problem in the HAP code with cleaning up a half-created guest. So it's
probably two bugs. :-)
-- Keir
> Apr 7 03:09:18.695893 (XEN) hvm_vcpu_initialise: nestedhvm_vcpu_initialise
> returned -95
> Apr 7 03:09:18.703835 (XEN) Assertion 'd->arch.paging.hap.total_pages == 0'
> failed at hap.c:699
> [...]
> Apr 7 03:09:18.915908 (XEN) Xen call trace:
> Apr 7 03:09:18.915950 (XEN) [<ffff82c48020429f>]
> hap_teardown+0x1a8/0x229
> Apr 7 03:09:18.923861 (XEN) [<ffff82c4801ccb7c>]
> paging_teardown+0x25/0x135
> Apr 7 03:09:18.923922 (XEN) [<ffff82c4801584d1>]
> domain_relinquish_resources+0x6b/0x23c
> Apr 7 03:09:18.935903 (XEN) [<ffff82c480105287>] domain_kill+0x95/0xe9
> Apr 7 03:09:18.943841 (XEN) [<ffff82c48010324c>] do_domctl+0xd8e/0x1a02
> Apr 7 03:09:18.943900 (XEN) [<ffff82c480212f28>]
> syscall_enter+0xc8/0x122
> Apr 7 03:09:18.955837 (XEN)
> Apr 7 03:09:18.955875 (XEN)
> Apr 7 03:09:18.955909 (XEN) ****************************************
> Apr 7 03:09:18.955961 (XEN) Panic on CPU 7:
> Apr 7 03:09:18.956003 (XEN) Assertion 'd->arch.paging.hap.total_pages == 0'
> failed at hap.c:699
> Apr 7 03:09:18.963863 (XEN) ****************************************
>
>
>> 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+mi>>>>
d
>>>> :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-Overvie>>>>>
w
>>>>> -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
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>
>
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