For several years I have run both the Knoppix ISO-image and disk-based versions under kvm for installs, maintenance etc. The basic method works for 8.3 too, but only as far as the first flash install.
Klaus K has made Knoppix more "fool-proof" to run under kvm by restricting it to read-only mode. For many users, that is clearly a feature: You may run your ordinary Knoppix install under kvm so it functions as both host and guest at once, but if persistent store is involved, and the host and the guest instances perform different updates to that, then what?
It is only a question of time until the file system is corrupted - it is easy to imagine that prof. Knopper has introduced this restriction from experiences with broken systems.
The bug is that it doesn't stop there. If you run different copies of Knoppix on different partitions, or run Knoppix under another OS variety, even another version of Knoppix, the only thing to be careful about is that the partition where the persistent store of the VM resides is not writable by other OS'es. But don't try to explain that to Knoppix 8.3. It only checks whether it is run under kvm, and in that case, the system is mounted read-only. Which kind of blocks many important uses of Knoppix images.
While the default behaviour is "correct", there must be a cheatcode for disabling it, e.g. VIRTWRITE. I guess specialists on minirt.gz should not have too much problems rolling their own, but this is a general issue, so for me it belongs in Knopper-land proper.
Lot of 10pcs Brocade 57-1000012-01 8Gbps SWL 850nm SFP+ Optical Transceivers
$19.00
Silicom (PE210G2SPI9A-XR) 10Gb Dual Port SFP+ PCIe Ethernet Adapter Low Profile
$19.99
Cisco Nexus 48-Port 10G SFP+ Switch N9K-9396PX w/ 9K-M12PQ 12-Port 40G QSFP
$249.99
SFP-10G-LR Compatible 10GBase-LR SFP+ LR Transceiver 10G 1310nm SMF up ot 10km
$45.00
F5 Networks 10GB OPT-0016-00 F5-UPG-SFP+-R 10GBASE/SR SFP Transceiver
$4.00
NEW Sealed Cisco SFP-10G-LR 10GBASE-LR SFP+ 1310nm 10km *US Shipping*
$18.00
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
Mellanox Original MFM1T02A-SR 10GbE 10GBASE-SR SFP+ Transceiver
$9.00
10 PCS Cisco GLC-LH-SMD 10-2625-01 1310nm SFP Transceiver Module
$85.00
Cisco 10G SFP+ Module SFP-10G-SR 10-2415-03 (Lot of 5)
$24.99