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

To: Jeroen Groenewegen van der Weyden <groen692@xxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>

From: Keir Fraser <keir.xen@xxxxxxxxx>

Date: Thu, 07 Apr 2011 08:09:48 +0100

Cc: "Christoph.Egger@xxxxxxx" <Christoph.Egger@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "eddie.dong@xxxxxxxxx" <eddie.dong@xxxxxxxxx>

Delivery-date: Thu, 07 Apr 2011 00:10:50 -0700

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

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: 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+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 > > > _______________________________________________ > 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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