Package: debian-installer
Version: debian-testing-amd64-DVD-1.iso, from 2019-03-16
When installing Debian as a guest in KVM/QEMU assigning the ISO to a CD-ROM using Virtio or Virtio-SCSI as the bus type the debian-installer cannot see the CD-ROM drive and ask for drivers.
I assume the Virtio drivers are not bundled/loaded in the installer. It would be nice if it was :-)
In my benchmark of different bus types for CD-RO I got this read numbers:
-ata/ide: 541MB/s
-sata: 1,2GBs
-Virtio-SCSI: 3,6GB
Unfortunately I didn't test Virtio, but it should be at least just as fast as the Virtio-SCSI
I've read from RHEL that Virtio is a little faster (at least for HDDs).