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Let's start with the simple things... are the kvm kernel modules loaded?

"no supported architecture for os type 'hvm'" indicates that the KVM kernel modules were not loaded. To check:

# lsmod | grep kvm

If the output does not show that the kvm module is loaded, run the following command to load it:

# modprobe -a kvm

If you cannot start VMs after installation without rebooting, the permissions might not be set correctly. This can happen if you load the KVM module before you install nova-compute. To check whether the group is set to kvm, run:

# ls -l /dev/kvm

If it is not set to kvm, run:

# udevadm trigger