Hi,
I found the reason why the VM did not start in 4.16 after the upgrade. The following message appears during the start-up: libvirt.LibvirtException: unsupported configuration: io uring is not supported by this QEMU binary KVM Is CentOS 8.5 with advanced virtualization repo, now qemu has version: qemu-kvm-6.0.0-33.el8. This configuration works without any problem with CS 4.15, the question is, if anything has changed in the requirements or handling of kvm in 4.16? Regards, Piotr