[ovirt-users] Re: ESXi 6.7 as a nested VM on top of oVirt cluster.

Hi Gianluca Thank you very much for your reply! The command lines are (proverbially) huge but I spotted a few (notable) differences in '-cpu' option - if we ignore qemu cmd (please see my comment on standalone KVM OS): /usr/bin/qemu-system-x86_64 -cpu Haswell-noTSX-IBRS,vme=on,ss=on,vmx=on,rdrand=on,hypervisor=on,arat=on,tsc_adjust=on,umip=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,xsaveopt=on,pdpe1gb=on,abm=on,fma=off,aes=off,avx=off,f16c=off,bmi1=off,avx2=off,smep=off,bmi2=off Not sure if "host" is a "shortcut" for all CPU flags exposed to the nested VM: /usr/libexec/qemu-kvm -cpu host,vmx=on (in oVirt management, "Pass-Through Host CPU" is selected, In Edit Host, "Kernel" tab, Kernel command line has "kvm-intel.nested=1" and as mentioned vdsm nestedvt hook rpm was installed) openSUSE 15.1 Intel(R) Celeron(R) CPU G1820 @ 2.70GHz the newest oVirt 4.3.8 with both CentOS 7.7 hypervisors fully updated. Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz Correct. For ESXi, I use e1000 on both standalone KVM and oVirt KVM hypervisor. If you need any additional info, please let me know. Thank you! Regards, Branimir