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.
Genuine OEM Samsung Galaxy Tab S6 Lite Book Cover -NEW EF-BP610PJEGUJ- #E4
$10.00
Samsung Galaxy Tab A 32GB -UNLOCKED- 10.4 Screen
$69.99
Samsung - S Pen Creator Edition - White
$38.00
Samsung Galaxy Tab A 8" SM-T387V 32GB Verizon Tablet (No SIM Tray) Grade B
$31.99
Samsung Galaxy Tab A9+ 11.0" 64GB Gray Wi-Fi Tablet Bundle SM-X210NZAYXAR 2023
$149.99
Samsung 990 PRO With Heatsink 2 Tb New
$140.00
Samsung Chromebook XE350XBA-K05US 15.6" 1080p FHD Laptop Intel 4GB RAM 128GB SSD
$89.69
Samsung Chromebook 3 4GB 16GB SSD 11.6-Inch Laptop XE500C13-K02US HDMI WIFI
$39.59
Samsung 1.6TB SSD SAS 2.5" 12G PM1635 MZILS1T6HCHP NetApp 520 Block
$174.99
Samsung 27" Curved Monitor - S39C - 75 hz, 4ms FHD IPS LED (OPEN BOX)
$119.99