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.
Apple IIe Vintage Computer A2S2064 w/IO Controller & Printer Connector Board
$179.99
Vintage Apple IIe 2e iie Computer A2S2064
$215.00
Vintage Apple A2M2010 Monitor II, Green Phosper CRT
$99.99
Vintage Apple IIe Computer A2S2128 (825-1351-A)
$174.99
Pasco Scientific 6575 Apple II+ Apple IIe Game Port Interface VINTAGE
$50.00
Vintage Apple IIe A2S2064 Personal Computer, Untested Powers On
$149.95
Vintage Apple Macintosh IIe A2S2064 POWERS ON DECENT CONDITION
$125.00
Vintage Apple 3.5" Drive Floppy Disk Drive A9M0106 - Untested
$69.99
Vintage Apple Macintosh 512K / Mouse, Keyboard & Extras + Carry Case / Turns On
$260.00
VINTAGE APPLE MACINTOSH IISi COMPUTER & Keyboard In Original Box As-IS
$210.00