[ovirt-users] Nested KVM - vdsm-hook-nestedvt

[Martin Polednik]

On 04/01/16 09:52 +0100, Simone Tiraboschi wrote:
>On Fri, Jan 1, 2016 at 3:32 PM, Winfried de Heiden <wdh at dds.nl> wrote:
>
>> Hi all and happy new year!
>>
>> I'm running oVirt 3.6 on EL7.
>>
>> In order to test nested-kvm I installed vdsm-hook-nestedvt on the
>> hypervisor and put "fake_kvm_support = true" in /etc/vdsm/vdsm.conf.
>
>
>
>
>fake_kvm_support is just for developing purposes and it's not needed as it
>prevent guests to run.

Not really true - fake_kvm_support enables QEMU emulation instead of
hardware virtualization (e.g. VT-x) instructions. It is also quite
broken in it's current state and fix is pending in cpuinfo branch at
gerrit.

I don't really understand the reason why fake_kvm would be used in
this case as AMD-v is enabled according to svm flag present -
following instructions should be correct for getting the flag passed
to the VMs.

>Please check to understand if nested support is enabled on your host:
>/sys/module/kvm_intel/parameters/nested
>
>if not
>   echo "options kvm-intel nested=1" > /etc/modprobe.d/kvm-intel.conf
>and reload the module

>Than install vdsm-hook-nestedvt on your hosts.
>If you want also to use the network on your L2 guest please install and
>configure also macspoof vdsm hook on your physical hosts otherwise all the
>traffic to/from your L2 guests will be dropped.
>https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/macspoof
>
>
>
>
>> However, afterwards the hypervisor host cannot connect to the ovirt
>> Manager, on ovirt Manager the engine.log will tell:
>>
>> 2016-01-01 15:21:42,105 WARN
>> [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector]
>> (DefaultQuartzScheduler_Worker-76) [71d1638c] Correlation ID: 29daf92c,
>> Call Stack: null, Custom Event ID: -1, Message: Host bigvirt moved to
>> Non-Operational state as host does not meet the cluster's minimum CPU
>> level. Missing CPU features : model_Opteron_G3
>>
>> After removing the option all works well again, but I'ḿ lacking the nested
>> kvm option :( Is nested kvm only supported on a limited cpu's??
>>
>> Winny
>>
>> Information from /proc/cpuinfo:
>>
>> processor       : 0
>> vendor_id       : AuthenticAMD
>> cpu family      : 16
>> model           : 10
>> model name      : AMD Phenom(tm) II X6 1055T Processor
>> stepping        : 0
>> microcode       : 0x10000bf
>> cpu MHz         : 2800.000
>> cache size      : 512 KB
>> physical id     : 0
>> siblings        : 6
>> core id         : 0
>> cpu cores       : 6
>> apicid          : 0
>> initial apicid  : 0
>> fpu             : yes
>> fpu_exception   : yes
>> cpuid level     : 6
>> wp              : yes
>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
>> cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
>> pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc
>> extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm
>> extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt
>> cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter
>> bogomips        : 5625.54
>> TLB size        : 1024 4K pages
>> clflush size    : 64
>> cache_alignment : 64
>> address sizes   : 48 bits physical, 48 bits virtual
>> power management: ts ttp tm stc 100mhzsteps hwpstate cpb
>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>

>_______________________________________________
>Users mailing list
>Users at ovirt.org
>http://lists.ovirt.org/mailman/listinfo/users