hi, nova boot --flavor compute --image y --key-name y --nic net-id=a2e384a5-c699-4f1c-a558-2e0aeee04d20 y nova show y

"No valid host was found. There are not enough hosts available.

virt-host-validate QEMU: Checking if IOMMU is enabled by kernel : WARN (IOMMU appears to be disabled in kernel. Add intel_iommu=on to kernel cmd