Beware, so you (too) won’t be bitten by this.
If you’re running vanilla KVM with default qemu-kvm -packages in RHEL (CentOS and probably others):
https://git.centos.org/blob/rpms!qemu-kvm!/958e1b8dccf9809600478f316ab641d490881fe7/SOURCES!kvm-rhel-Drop-machine-type-pc-q35-rhel7.0.0.patch;jsessionid=mc5igseasal0axkra6qhd4it
In short, q35 -support was a technical preview which is now dropped from qemu-kvm (qemu-kvm-rhev -only feature from now on), back to “pc”…