Hi Gianluca Thank you very much for your reply!
On Mon, Feb 3, 2020 at 3:16 PM <branimirp(a)gmail.com> wrote:
Can you compare the qemu-kvm command line between:
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):
- the nested ESXi 6.7 on top of the standalone KVM hypervisor
/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
- the nested ESXi 6.7 on top of oVirt based hypervisor
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)
Also, which OS version of the standalone KVM hypervisor?
openSUSE 15.1
which cpu for the KVM hypervisor Intel(R) Celeron(R) CPU G1820 @ 2.70GHz
which oVirt version? the newest oVirt 4.3.8 with both CentOS 7.7 hypervisors fully updated.
which cpu for the oVirt hypervisor? Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
did you use e1000 as the network interface type also in oVirt for the ESXi 6.7 VM?
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