Hello everyone,

I am relatively new to the community, thanks in advance for your time and help.

I have an openstack cluster ready, working with several compute nodes based on x86 architecture. My current installation is based on Ussuri. I have recently acquired a couple of nvidia Jetson devices ( https://www.nvidia.com/en-us/autonomous-machines/embedded-systems/jetson-agx...) which I want to connect to the cluster.

The arm cpu model name is ARMv8 Processor rev 0 (v8l). CPU flags on the arm architecture are different and hence egrep -c '(vmx|svm)' /proc/cpuinfo is empty to the best of my knowledge.

However, i re-build the custom linux kernel (i.e, Tegra) of the Jetson device, enabling the KVM module. So once i used:

*sudo kvm-ok* INFO: /dev/kvm exists KVM acceleration can be used

*dmesg | grep -i kvm* [ 1.372478] kvm [1]: 16-bit VMID [ 1.372489] kvm [1]: IDMAP page: 80fa1000 [ 1.372498] kvm [1]: HYP VA range: 4000000000:7fffffffff [ 1.374185] kvm [1]: Hyp mode initialized successfully [ 1.374299] kvm [1]: vgic-v2@3884000 [ 1.374763] kvm [1]: vgic interrupt IRQ1 [ 1.374790] kvm [1]: virtual timer IRQ4

*dmesg | grep -i 'CPU features'* [ 0.687366] CPU features: detected feature: Privileged Access Never [ 0.687372] CPU features: detected feature: LSE atomic instructions [ 0.687378] CPU features: detected feature: User Access Override [ 0.687385] CPU features: detected feature: 32-bit EL0 Support

Does this suffice to say that I can use KVM with libvirt for the nova openstack? The version of libvirt is 6.0.0.

From the nova logs i see the following with *virt_type = qemu*

WARNING nova.virt.libvirt.driver [-] The libvirt driver is not tested on qemu/aarch64 by the OpenStack project and thus its quality can not be ensured. For more information, see: https://docs.openstack.org/nova/latest/user/support-matrix.html

And as it detects the aarch64 device: CPU mode "host-passthrough" was chosen

If i try to launch an instance i get the following error with qemu libvirt.libvirtError: unsupported configuration: CPU mode 'host-passthrough' for aarch64 qemu domain on aarch64 host is not supported by hypervisor

where as i i use *virt_type= kvm* the error after trying to launch an instance is libvirt.libvirtError: unsupported configuration: Emulator '/usr/bin/qemu-system-aarch64' does not support virt type 'kvm'

Any advice on how to proceed?

all the best Pavlos.