Based Copied from - on : https://issues.redhat.com/browse/RHEL-26264

What were you trying to do that didn't work?
When the guest uses virtio-scsi controller and is protected with smmuv3, after reboot the guest e.g. via "virsh reboot vm", the qemu process will report a message: "virtio: zero sized buffers are not allowed".

libvirt libvirt-10.10.0-9.el9.aarch64
qemu-kvm qemu-kvm-9.1.0-17.el9.aarch64
kernel kernel-5.14.0-573.el9.aarch64+64k
edk2-aarch64 edk2-aarch64-20241117-3.el9.noarch

How reproducible:
always

Steps to reproduce:
1) prepare VM and start a SCSI guest with smmuv3 protection and iommu_platform=on into virtio-scsi device (e.g. virsh define vm2a.xml)

2) wait till the vm2 starts
3) run virsh reboot vm2
4) check qemu report ( /var/log/libvirt/qemu/vm2.log )

Expected results
Guest rebooted without anything

Actual results
qemu reports:

qemu-kvm: virtio: zero sized buffers are not allowed