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 Two Vintage Apple Macintosh Computers Models 128k M0001 For Parts
$250.00
Vintage Apple Macintosh SE Case - Empty Shell - Housing retro project
$60.00
Vintage Apple Power Macintosh 7600/132 PowerPC Computer M3979 W Box And Keyboard
$499.00
Apple Macintosh SE/30 M5119 Vintage Mac Computer BAD FLOPPY DRIVE FOR PARTS
$350.00
VINTAGE APPLE MACINTOSH POWERBOOK 180 ( M4440) Powers On
$100.00
Apple Macintosh Startup Disk for Vintage Mac - System 1.1 w/ MacWrite & MacPaint
$9.99
Macintosh 1980's Vintage Rainbow Apple Computer Carry Bag Case Tote Mac
$40.00
VINTAGE Ehman EXTERNAL SCSI MACINTOSH HARD DISK DRIVE w/HDD
$49.95
APPLE MACINTOSH PLUS M0001A Vintage Mac Computer Tested Working
$799.99
Vintage Apple Macintosh Powerbook Desktop Laptop Computer Duo Dock Model M7779
$299.99