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