[Users] Nested virtualization with Opteron 2nd generation and oVirt 3.1 possible?

[Itamar Heim]

On 11/20/2012 04:05 PM, Gianluca Cecchi wrote:
> Hello,
> I have 2 physical servers with Opteron 2nd gen cpu.
> There is CentOS 6.3 installed and some VM already configured on them.
> Their /proc/cpuinfo contains
> ...
> model name : Dual-Core AMD Opteron(tm) Processor 8222
> ...
>
> kvm_amd kernel module is loaded with its default enabled nested option
>
> # systool -m kvm_amd -v
> Module = "kvm_amd"
>
>    Attributes:
>      initstate           = "live"
>      refcnt              = "15"
>      srcversion          = "43D8067144E7D8B0D53D46E"
>
>    Parameters:
>      nested              = "1"
>      npt                 = "1"
> ...
>
> I already configured a fedora 17 VM as a oVirt 3.1 Engine
>
> I'm trying to configure another VM as oVirt 3.1 node with
> ovirt-node-iso-2.5.5-0.1.fc17.iso
> It seems I'm not able to configure so that ovirt install doesn't complain.
>
> After some attempts, I tried this in my vm.xml for the cpu:
>    <cpu mode='custom' match='exact'>
>      <model fallback='allow'>athlon</model>
>      <vendor>AMD</vendor>
>      <feature policy='require' name='pni'/>
>      <feature policy='require' name='rdtscp'/>
>      <feature policy='force' name='svm'/>
>      <feature policy='require' name='clflush'/>
>      <feature policy='require' name='syscall'/>
>      <feature policy='require' name='lm'/>
>      <feature policy='require' name='cr8legacy'/>
>      <feature policy='require' name='ht'/>
>      <feature policy='require' name='lahf_lm'/>
>      <feature policy='require' name='fxsr_opt'/>
>      <feature policy='require' name='cx16'/>
>      <feature policy='require' name='extapic'/>
>      <feature policy='require' name='mca'/>
>      <feature policy='require' name='cmp_legacy'/>
>    </cpu>
>
> Inside node /proc/cpuinfo becomes
> processor : 3
> vendor_id : AuthenticAMD
> cpu family : 6
> model : 2
> model name : QEMU Virtual CPU version 0.12.1
> stepping : 3
> microcode : 0x1000065
> cpu MHz : 3013.706
> cache size : 512 KB
> fpu : yes
> fpu_exception : yes
> cpuid level : 2
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
> pse36 clflush mmx fxsr sse sse2 syscall mmxext fxsr_opt lm nopl pni
> cx16 hypervisor lahf_lm cmp_legacy cr8_legacy
> bogomips : 6027.41
> TLB size : 1024 4K pages
> clflush size : 64
> cache_alignment : 64
> address sizes : 40 bits physical, 48 bits virtual
> power management:
>
> 2 questions:
>
> 1) Is there any combination in xml file to give to my VM so that oVirt
> doesn't complain about missing hardware virtualization with this
> processor?
>
> 2) suppose 1) is not possible in my case and I still want to test the
> interface and try some config operations to see for example the
> differences with RHEV 3.0, how can I do?
> At the moment this complaint about hw virtualization prevents me to
> activate the node.
>
> I get
> Installing Host f17ovn01. Step: RHEV_INSTALL.
> Host f17ovn01 was successfully approved.
> Host f17ovn01 running without virtualization hardware acceleration
> Detected new Host f17ovn01. Host state was set to Non Operational.
> Host f17ovn01 moved to Non-Operational state.
> Host f17ovn01 moved to Non-Operational state as host does not meet the
> cluster's minimum CPU level. Missing CPU features : CpuFlags
>
> Can I lower the requirements to be able to operate without hw
> virtualization in 3.1?
>
> Thanks in advance,
> Gianluca
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i don't remember if amd nested virt is supported in this platform.
easiest would be to try http://gerrit.ovirt.org/#/c/9225/.
or switch to fedora 17, which has both intel and amd nested virt support.